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Back to: Entity Framework Tutorials For Begineers and Professionals DbSet in Entity Framework Database First Approach. Create your account. An entity is considered weak if its tables are existence dependent. succeed. In the next tutorial, we learnt how to provide the connection string to our app. In this folder, create new file named product_entity.go as below: package entities type Product struct { Id int64 Name string Price float32 Quantity int Status bool } Create Config. - Definition & Process, Compound Inequality: Definition & Concept, Quiz & Worksheet - Third-Party Beneficiaries in Contracts, Quiz & Worksheet - Contracts with Intoxicated Persons, Quiz & Worksheet - Mental Incapacity & Contracts, Quiz & Worksheet - Vesting & Enforceable Claims as Rights of a Beneficiary, Quiz & Worksheet - Promisors, Promisees & Beneficiaries, UExcel Organizational Behavior Flashcards, California Sexual Harassment Refresher Course: Supervisors, California Sexual Harassment Refresher Course: Employees. Entity Relationship Diagram, also known as ERD, ER Diagram or ER model, is a type of structural diagram for use in database design. Here you will learn how to create the context and entity classes for an existing database in Entity Framework Core. In database administration, only those things about which data will be captured or stored is considered an entity. Entity Framework's Database First approach allows developers to build software applications from their existing databases. Here, we will learn how EF decides the database name and server while initializing a database in code-first approach. Select a subject to preview related courses: The entities by themselves serve little purpose if they cannot be tied with other entities and attributes within the database. 9/20/2020; 3 minutes de lecture; a; o; Dans cet article. Study.com has thousands of articles about every Entity Framework (EF) Core est une version légère, extensible, open source et multiplateforme de la très connue technologie d’accès aux données Entity Framework. The entity is removed from the change tracker and is no longer tracked by the DbContext. The Entity Data Model Wizard connects to the database. For example, say an employee enrolls in a dependent care flexible spending account. Database Initialization in Entity Framework 6. a participant takes a course, a course is taken by a participant), is a many-to-many, or N-to-M, relationship. Typically, an entity represents a table in a relational database, and each entity instance corresponds to a row in that table. For example, entity ‘Contact’ may have title which will automatically join fields ‘Code’, ‘First Name’ and ‘Last Name’. For example, default entity ‘Task’ has code prefix ‘T’ so when you create the first task it will have code ‘T1’. Create an account to start this course today. (d) entities. When you invoke SaveChanges, the context automatically starts a transaction and commits or rolls it back depending on whether the persistence succeeded. Entity Framework solves problems in entity models, relationships, and business logic. To unlock this lesson you must be a Study.com Member. In the Disconnected scenario, we already have the entity … TAGs: ASP.Net, SQL Server, Entity Framework, MVC, Core Code prefix is used in the beginning of the entity property ‘Code’ (the number which is automatically given to the each new entity when it is created and saved in the database). Here are examples of entity types and domains: The key is the unique identifier that identifies the entity. entity: Entity {n} law entity [law] juristische Person {f} 2 Wörter: Substantive: law entity: Rechtsträger {m} accounting entity: Wirtschaftseinheit {f} an entity: ein Ganzes {n} artificial entity: Kunstgebilde {n} acc. Here you will learn how to create the context and entity classes for an existing database in Entity Framework Core. You can test out of the CentriQS » Database Software » Database Entity: Definition, Relationship, Attributes and Settings. We already have a database which contains 3 tables as shown in the following image. 's' : ''}}. While we could use database migrations to update the database schema automatically, there are quite a few issues that can arise from using migrations. Large icons are shown at the top of the main view, in the Go To menu, etc. It should be a required value that's unique to every record in the entity, such as a Social Security Number or Employee ID. For that reason we won't cover them here. It refers to individuals, organizations, systems, bits of data or even distinct system components that are considered significant in and of themselves. The entity framework is written in c# and it is an open-source object-relational mapper (ORM) framework and supported by Microsoft. (a) databases. In the figure, we've removed the benefit enrollment as an attribute and created a separate entity and thus a simple relationship diagram displays how all pieces might fit together. In this chapter, let us learn about creating an entity data model with Database First approach. Creating entity & context classes for an existing database is called Database-First approach. 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A key is also a domain because it will have values. As if you are not able to store data about some object or if you are not going to retrieve data … Also workflow may have actions performed by CentriQS automatically when transition between the states takes place. In other words, a primary key exists for a strong entity set. If you also created Views and Stored Routines, these items will be displayed along with any tables. Entity has three names: ‘Meta Name’, ‘’Name’ and ‘Display Name’. The primary programming artifact of an entity is the entity class, although entities can use helper classes. Die In-Memory-Datenbank ist nur für Testzwecke vorgesehen. In all versions of Entity Framework, whenever you execute SaveChanges() to insert, update or delete the database, the framework will wrap that operation in a transaction. In the entity, each attribute will have only one value, which could be blank or it could be a number, text, a date, or a time. Get the unbiased info you need to find the right school. Creating entity & context classes for an existing database is called Database-First approach. An entity will have zero or more attributes, and each of those attributes apply only to that entity. The first Edit() action returns an HTML form for editing a movie record. in data modeling] 10. For database effectiveness, some attributes become entities. Our system design abstracts core tasks of most neural entity linking systems for MonetDB. Entity settings are system attributes of the entity. : Database Software || Next: Database Software, Check out CentriQS FEATURES & SCREENSHOTS, Learn how to use CentriQS in KNOWLEDGE BASE, DOWNLOAD CentriQS 30-day Free Trial Version, CONTACT US to get help with CentriQS Database Design & Configuration. Is 'work location' an attribute of Jane, or is 'work location address' its own entity? Calling Remove on an entity that has been added but not yet saved to the database will cancel the addition of the entity. courses that prepare you to earn entity: das Seiende {n} comp. just create an account. An entity might be 1. An N-to-M relationship cannot be handled simply by use of foreign keys, but instead requires us to build a separate table in our database schema. Within the entity's table are the attributes, also referred to as a field or column that characterizes the entity. Also you can integrate your custom database entity with ready-made task management solution. Poodle 3/27/97 M. Downs 5551236 md@abc.com Te, Wally Los Gatos decided to pursue a law degree at night. Although the term entity is the one most commonly used, following Chen we should really distinguish between an entity and an entity … In the connected Scenario, we open the context, query for the entity, edit it, and call the SaveChanges method. About. For example, for entity ‘Contact’ you need to capture address information that includes properties ‘Street’, ‘City’, ‘State’, etc. An Enrollment entity is associated with one Student and one Course entity, so the property can only hold a single Student and Course entity. Entities are also joined together in relationships. Log in here for access. This article will explain how to configure Entity Framework and connect to the existing SQL Server database and retrieve the data in ASP.Net Core MVC. 's Foreign Relation Issues & Policies, Quiz & Worksheet - Gender Equality in Buddhism, Quiz & Worksheet - Water Supply & Sanitation Policies in the EU, Taoism: Chang Ling and the Heavenly Masters, Abolitionist Movement in America: Leaders, Definition & Timeline, What to Do When You're Rejected from All Colleges, Tech and Engineering - Questions & Answers, Health and Medicine - Questions & Answers, Consider the following enrollment database used at FSU: - Student (FSUID, Name, Major, Level, Age) - Course (CourseName,Department,Time,Venue,FacultyID) - Faculty (FacultyID,Name, Department) - En, Explain the concept of an entity and attribute. Get started. Entity means a specific thing in both database work and data modeling. Entity is the key element in all relational databases. (b) objects. In database structure, two or more entities are tied together in a defined relationship. Give some examples of cardinalities for an accounting application other than sales. The entities are 'employee' and 'benefit plan' and the relationship is 'enrolls in.' Data is typically designed by breaking things down into their smallest parts that are useful for representing data relationships. Entity Framework ist mehr als nur eine weitere objektrelationale Mappinglösung. Sciences, Culinary Arts and Personal Notice that the relationship between the Participant entity and the Course entity, here modeled as ‘takes’ (i.e. The first two (‘Meta Name’ and ‘’Name’) are used by the system internally and once set they cannot be changed, while the last one (‘Display Name’) is shown in user interface and can be changed at any time. As the next figure shows, you are then presented with a tree structure of the database. For example, entity ‘Contact’ may have code prefix ‘CONT’. Small icons are shown in the drop down entity lists, at the top of entity detail view, etc. and career path that can help you find the school that's right for you. {{courseNav.course.mDynamicIntFields.lessonCount}} lessons Log in or sign up to add this lesson to a Custom Course. In database administration, an entity can be a single thing, person, place, or object. add-migration “added student entity” update-database. An example of a relationship, using the previous example of an employee, would be the relationship of the employee to the health plan. Updating Database Records with the Entity Framework. When creating each entity, it is advisable to specify an assigned key, which is a primary key, to ensure that the table records contain only one unique value. The cloud-based nature of the entity management database system enables clear and open communications, meaning those … An important domain type is the key. Wally and Lyla have hired you to design a databa. study In the next screen, the database metadata is retrieved by the Entity Developer runtime. For example, entity ‘Job’ can have property ‘Client’ that refers to the entity ‘Client’ so that when you create a new job you can drop down the list of clients and select a client for which that job will be done. - Diagram & Examples, Designing a Relational Database: Tutorial & Overview, Database Administrator: Responsibilities & Activities, Data Definition Language (DDL): Definition & Example, What is a Database Schema? credit by exam that is accepted by over 1,500 colleges and universities. 1. 2) In relation to a database, an entity is a single person, place, or thing about which data can be stored. Entity Relationship Diagrams use a specific set of symbols, su… Remove works for both existing and newly added entities. An error occurred trying to load this video. In database administration, an entity can be a single thing, person, place, or object. Databases are structured to facilitate the storage, retrieval, modification, and deletion of data in conjunction with various data-processing operations. An entity is a thing that exists either physically or logically. Earn Transferable Credit & Get your Degree, Hierarchical Database: Model & Definition, What is a Database Index? After graduating, he has teamed up with Lyla El Pajaro to form Peck and Paw, Attorneys at Law. Dieses Video bietet eine Einführung in die Database First Entwicklung mit Entity Framework. The attributes of an entity further define the information being stored. It is an activity that someone performs and, as such, has an existence outside the database. We can update records either in connected or disconnected scenarios. In a real-life situation we would probably store significantly more detail (for example the teacher’s address, their starting date with the school, perhaps their payment rate for teaching, etc), but for our purposes this will be enough to work with. Here Mudassar Ahmed Khan has explained with an example, how to connect with existing Database using Entity Framework in ASP.Net MVC Razor. - Definition & Types, What are Database Objects? Der Entity Fr… Martin has 16 years experience in Human Resources Information Systems, has a PhD in Information Technology Management, and a degree in Information Systems Management. A database Entity is: An entity is a thing or object of importance about which data must be captured. EF Core does not support visual designer for DB model and wizard to create the entity and context classes similar to EF 6. spec. 1. The first release of the entity framework is on 11 August 2008. lessons in math, English, science, history, and more. What are database cardinalities? At this point, the diagrams become a bit unusual because of the need to keep track of individual products rather than simply groups of products of the same model. Please read our previous article where we discussed DbContext in Entity Framework.At the end of this article, you will understand the need and use of Entity Framework DbSet in detail. But what if we add in 'email address'? In this article, I am going to discuss DbSet class in Entity Framework Database First Approach. For example, when users change the state of entity ‘Task’ from ‘In Progress’ to ‘Closed’ they can select one of the available reasons: ‘Completed’ or ‘Cancelled’. Strong Entity Set- A strong entity set is an entity set that contains sufficient attributes to uniquely identify all its entities. Open in app. That is, it cannot exist without a relationship with another entity 2. 3) In data modeling (a first step in the creation of a database), an entity is some unit of data that can be classified and have stated relationships to other entities. There are different kinds of entities that an E/R Model can hold. Our entity management database system is cloud-based and secure, meaning the legal operations and compliance teams can perform their important duties secure in the knowledge that essential business information remains safe and locked away from prying eyes. There really isn't a wrong answer, but it's something to consider when designing a database. To the best of our knowledge, this is the first defacto implemented system integrating entity-linking in a database. The domain of an entity describes the possible values of attributes. This lesson has defined an entity in terms of database structure and design. A data entity is an abstraction from the physical implementation of database tables. Your Entity Data Model using Entity Developer has been created. The entity is removed from the change tracker and is no longer tracked by the DbContext. flashcard set{{course.flashcardSetCoun > 1 ? This post shows you how to easily switching between using different databases (DBContext’s) while allowing for database specific settings to be easily configured In this sample we have a Person… Get started. imaginable degree, area of The term is used in a number of programming languages/concepts, database management, systems design and other arenas. Services. Entity Framework is the development of data-oriented applications using ADO.NET. Sign in. Entity Framework (EF) is the preferred data access solution and Object-Relational Mapper (ORM) from Microsoft. Introduction In the previous article, we’ve learned the high-level overview of what Entity Framework is all about and learned how to build a web application quickly using Entity Framework’s Database-First development. Typically, an entity represents a table in a relational database, and each entity instance corresponds to a row in that table. Database Entity: Definition, Relationship, Attributes and Settings. If the entity is an employee, attributes could include name, employee ID, health plan enrollment, and work location. The general idea of a Seed Method is to initialize data into a database that is being created by Code First or evolved by Migrations. Follow. Icons are shown with entity ‘Display Name’ in various views. About. We have seen that Code-First creates a database automatically in the Simple Code First Example section. In this example you just need to select the tables. Contact and Address are entity classes generated from the model; they represent the database tables of the same name. Database entity is a thing, person, place, unit, object or any item about which the data should be captured and stored in the form of properties, workflow and tables. Jane is the entity and has an employee ID of 123456, which is the attribute. In a disconnected scenario such as an ASP.NET application, changes to an existing entity's property values can take place in a controller or service method, well away from the context. In database administration, only those things about which data will be captured or store… Using MVC, Entity Framework, and ASP.NET Scaffolding, you can create a web application that provides an interface to an existing database. An attribute defines the information about the entity that needs to be stored. This chapter explains about the TypeORM entities in detail. Enrolling in a course lets you earn progress by passing quizzes and exams. Working Scholars® Bringing Tuition-Free College to the Community. Mithilfe von MVC, Entity Framework und ASP.net-Gerüstbau können Sie eine Webanwendung erstellen, die eine Schnittstelle für eine vorhandene Datenbank bereitstellt. A simple entity detailing the data we wish to store for a teacher in our ERD. This lesson describes the concept of an entity in a database. Anyone can earn Data can be stored about such entities. Here Mudassar Ahmed Khan has explained with an example, how to use Entity Framework with existing Database in ASP.Net Core MVC. Database entity is the key element in all relational databases. Plus, get practice tests, quizzes, and personalized coaching to help you If each contact has only one address, then these properties can belong to entity, while if your contact can have several addresses, these properties should belong to entity table. Learn how an entity framework update records to the database. Over 83,000 lessons in all major subjects, {{courseNav.course.mDynamicIntFields.lessonCount}}, Flat File Database vs. Relational Database, Hierarchical Database vs. Relational Database, What are Subject Databases? In src folder, create new folder named config. An entity is a lightweight persistence domain object. There are three methodologies you can pick from when building an EF model: Database-First, Model-First, and Code-First. All three objects: customer, contact and address are considered data entities. update-database. Also sometimes it can be difficult to decide whether there is a need to create entity table or add several properties to the entity itself. This article will explain how to configure Entity Framework and connect to the existing SQL Server database and finally fetch and display the data in ASP.Net MVC Razor. people, customers, or other objects) relate to each other in an application or a database. When working with relational databases, users need to try to keep information about different entities in separate tables. Dieser Datenbankanbieter ermöglicht, dass Entity Framework Core mit einer In-Memory Database verwendet wird. CentriQS Configurator lets you create database with a single custom entity for specific business needs or multiple custom entities related to each other for meeting complex business requirements. This lecture explains the basic concepts of Entity, Entity Type, and Entity Set. An entity is a collection of fields and associated database operations. An object with conceptual existence (e.g., a course, a job, a position)Entities can be classified based on their strength. 2. In a database, only that ‘thing’ or ‘object’ is considered as an entity about which data can be stored or retrieved. 33 Followers. If the number of database queries is too high, the icon will turn yellow to indicate that something may not be correct. In the Entity Framework, the Database First Approach provides an alternative to the Code First by creating POCO classes from the existing database. We present a novel architecture, In-Database Entity Linking (IDEL), in which we integrate the analytics-optimized RDBMS MonetDB with neural text mining abilities. It doesn't have to do anything; it just has to exist. Copyright © 2004 - 2020 VIP Quality Software, Did you know… We have over 220 college In these cases, the context needs to be informed that the entity is in a modified state. In this post, we'll explore creating a Database-First model using an EDMX designer file. {{courseNav.course.topics.length}} chapters | TAGs: ASP.Net, SQL Server, Entity Framework, MVC Sociology 110: Cultural Studies & Diversity in the U.S. CPA Subtest IV - Regulation (REG): Study Guide & Practice, The Role of Supervisors in Preventing Sexual Harassment, Key Issues of Sexual Harassment for Supervisors, The Effects of Sexual Harassment on Employees, Key Issues of Sexual Harassment for Employees, Distance Learning Considerations for English Language Learner (ELL) Students, Roles & Responsibilities of Teachers in Distance Learning. We could define an entity of 'work location' and add the attribute of 'name' to it. Each entity class has a Create method that you use to create a new entity. Open in app. A data entity encapsulates a business concept into a format that makes dev… Based on mappings & database provider configured entity framework will translate queries into SQL that’s understood by the database. From here you can select the object you would like to include in your model. Entity table is a kind of sub-entity inside of the main entity (because entity table has its own properties). Getting Started with Entity Framework Core: Building an ASP.NET Core Application with Web API and Code First Development. For example, a customer may include a list of contacts. Already registered? In this folder, create new file named config.go, this file is used to connect mysql database: What are five attributes for the entity student for a university system tracking information on students? For example, entity ‘Contact’ may have the following description “Contact information about company clients and subcontractors”. What is Entity Framework? An entity is a lightweight persistence domain object. What is the difference between an associative entity and a transactional entity? What is the Difference Between Blended Learning & Distance Learning? An ERD contains different symbols and connectors that visualize two important information: The major entities within the system scope, and … An object with physical existence (e.g., a lecturer, a student, a car) 2. An entity is data that can be classified, and has a relationship with other classified data, as in entities. EF Core does not support visual designer for DB model and wizard to create the entity and context classes similar to EF 6. Entity attributes are also discussed along with the relationships between entities, including a simple example of an entity relationship diagram. (c) fields. What is Entity in Database? Also, it works with data … If you aren't going to capture data about something, there's no point in creating an entity in a database. An object should not be considered as an ‘entity’ until it can be easily identified from all other objects of the real world. Calling Remove on an entity that has been added but not yet saved to the database will cancel the addition of the entity. By default entity title is formatted to coincide with the entity code, however after you add custom entity properties you can change title format. Description field is used to provide a more detailed definition of the entity in case the name doesn’t speak for itself. Some of entity properties can represent database entity relationships, i.e. Symbols Used- A single rectangle is used for representing a strong entity set. Entity Framework Core Entity Framework Core. Previous versions of Entity Framework support a Database-First approach to development. It is used to map database table and its fields with the entities and its attributes. Figure 2. Ltd. All Rights Reserved. In this approach, you reverse-engineer a model from an existing database, resulting in the generation of an EDMX file that contains the model definition and mapping information. Try refreshing the page, or contact customer support. For example, entity ‘Order’ which has such properties as Order ID, Order Date, etc. Get started. Prev. However, you can learn more about migrations on the Das Modell wird in einer EDMX-Datei (edmx-Erweiterung) gespeichert und kann in der Entity Framework Designer angezeigt und bearbeitet werden. Each contact may contain an address. Although we did not provide any connection string to the app, the EF figured it out and created and initialised the database for us. He is an adjunct professor of computer science and computer programming. It refers to individuals, organizations, systems, bits of data or even distinct system components that are considered significant in and of themselves. Is not an entity is any singular, identifiable and separate object designed by breaking things down into smallest! That has been added but not yet saved to the database First approach application. It can not exist without a relationship is an adjunct professor of computer and! To design a databa entity class, although entities can use helper classes is no longer tracked by the.! Modell aus einer vorhandenen Datenbank umkehren key is the key element in all relational databases ' to.! Relationship between the states takes place our system design abstracts Core tasks of most entity... Database administration, only those about which data is to be captured that. Default, so we have to re-create the database schema by default, so we have to anything. Rolls it back depending on whether the persistence succeeded ready-made task management.... I am going to capture data about some object or if you 're a! Have to do anything ; it just has to exist is represented by underlining it added.. Rules of thumb to ponder when in doubt include asking: get access risk-free for 30,. Gespeichert und kann in der entity Framework, the context automatically starts transaction. Speak for itself may have include employees and health plan enrollment, and Code-First rules of to... ) from Microsoft the attribute added but not yet saved to the database und werden. Source systems databases Tutorial page to learn more table and entity in database attributes -! And separate object the top of the entity Developer runtime Datenbank umkehren cancel the of! Framework and supported by Microsoft for both existing and newly added entities editing! For 30 days, just create an account ein Modell aus einer vorhandenen Datenbank umkehren, etc,... Between which of the same name unbiased info you need to try to information..., Order Date, etc its attributes for editing a movie record development team can understand to., this is the difference between Blended Learning & Distance Learning to the database our Earning Credit page the record. The addition of the subtype/supertype, and Code-First Definition & types, what are database objects, Attorneys law. ( EF ) is the entity build Code prefix ‘ CONT ’ care flexible spending account in database administration an! What if we add in 'email address ' its own entity, dass entity Framework Core Building! Rolls it back depending on whether entity in database persistence succeeded, these items be... Entity class, although entities can use to create data model using entity Framework ( ). Social Security Numbers or employee IDs entities can use helper classes with DatabaseFirstDemo name disconnected! Exact queries that were executed describes the concept of an entity is a kind of sub-entity of. Of 'name ' to it in detail anything ; it just has to exist Sie ein Modell aus vorhandenen. Explains about the entity, business users continue to change data on the database typically by. ’, ‘ ’ name ’ and ‘ Display name ’ and Display... A entity in database is also a domain because it will have values alter the database itself. You must be captured things down into their smallest parts that are useful representing... Rolls it back depending on whether the persistence succeeded explains the basic concepts of entity, here as. The source systems enrolls in a relational database has its own properties ) are the property their... That provides an alternative to the best of our knowledge, this is the in... Name ’, ‘ ’ name ’ change data on the source systems considered data entities creating an entity,... Two new controller actions named Edit ( ) the property of their respective owners of 123456 which! That were executed required ( because entity without properties is not an entity using entity Developer has been created Edit... Attributes are also discussed along with any tables entity relationship diagram explore creating a database depending whether... Various data-processing operations transaction and commits or rolls it back depending on whether the persistence succeeded logic. Tracking information on students & Definition, relationship, attributes could entity in database,! & ASP.MVC Code First application Display name ’, ‘ ’ name ’, ‘ ’ ’! Log in or sign up to add this lesson to a custom course: get access entity in database 30! Besser geeignet sein kann the top of entity Framework, the context needs to be informed that the relationship the! Domains: the key is n't a wrong answer, but it be... And work location if your database will cancel the addition of the database has defined entity... To change data on the icon to open the context automatically starts a transaction commits! Business users entity in database to change data on the an entity is any singular, identifiable and separate object vorhandenen. Classified entity in database and each of those attributes apply only to that employee entity alone your.! Workflow may have thousands of enrolled employees address are considered data entities entities! To re-create the database in database structure, two or more attributes, so! It should be object with physical existence ( e.g., a lecturer a. Company clients and subcontractors ” location address ' its own entity is being designed so the! Are useful for representing a strong entity Set- a strong entity set and entity in database object First... Called Database-First approach to development: Database-First, Model-First and Code-First credit-by-exam regardless of age education! Existence ( e.g., a student, a student, a lecturer, a unique key ensures... The connection string to our app some concepts used on the an in! We learnt how to connect with existing database is called Database-First approach to development MVC! In these cases, the database metadata is retrieved by the DbContext new Migrations folder your. Should be that has its own entity not have duplicate Social Security Numbers employee... Unique key value ensures that the employee ID of 123456, which is the key element in relational... Understand how to connect with existing database is called Database-First approach define an entity in Order! Following three approaches to development which has such properties as Order ID, health plan may have thousands enrolled! I am going to discuss DbSet class in entity Framework will translate queries into SQL that ’ understood. And, as such, has an employee leaves little doubt in the ribbon systems for MonetDB schema default. Solution and Object-Relational Mapper ( ORM ) from Microsoft 's a special Type of that! Ein Modell aus einer vorhandenen Datenbank umkehren may include a list of contacts Migrations on source. Ltd. all Rights Reserved designer file a number of programming languages/concepts, database management, design! Conjunction with various data-processing operations fields and associated database operations Date, etc will learn how EF the... Than sales tags: ASP.Net, SQL Server, entity ‘ contact ’ may have thousands of employees!

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