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  1. www.w3schools.com › sql › sql_foreignkeySQL FOREIGN KEY Constraint - W3Schools

    SQL FOREIGN KEY Constraint. The FOREIGN KEY constraint is used to prevent actions that would destroy links between tables. A FOREIGN KEY is a field (or collection of fields) in one table, that refers to the PRIMARY KEY in another table.

  2. learn.microsoft.com › en-us › sqlCreate foreign key relationships - SQL Server | Microsoft Learn

    This article describes how to create foreign key relationships in SQL Server by using SQL Server Management Studio or Transact-SQL. You create a relationship between two tables when you want to associate rows of one table with rows of another.

  3. stackoverflow.com › questions › 48772How do I create a foreign key in SQL Server? - Stack Overflow

    You first need to check if the primary-key exists for the column you want to set your foreign key to reference to. In this example, a foreign key on table T_ZO_SYS_Language_Forms is created, referencing dbo.T_SYS_Language_Forms.LANG_UID -- First, chech if the table exists...

  4. learn.microsoft.com › en-us › sqlPrimary and foreign key constraints - SQL Server

    22 Ιουλ 2024 · Primary keys and foreign keys are two types of constraints that can be used to enforce data integrity in SQL Server tables. These are important database objects. Primary key constraints. A table typically has a column or combination of columns that contain values that uniquely identify each row in the table.

  5. www.w3schools.com › SQL › sql_ref_foreign_keySQL FOREIGN KEY Keyword - W3Schools

    A FOREIGN KEY is a field (or collection of fields) in one table that refers to the PRIMARY KEY in another table. The following SQL creates a FOREIGN KEY on the "PersonID" column when the "Orders" table is created:

  6. learn.microsoft.com › en-us › sqlCreate primary keys in SQL Server - SQL Server | Microsoft Learn

    18 Απρ 2024 · You can define a primary key in the SQL Server Database Engine by using SQL Server Management Studio or Transact-SQL. Creating a primary key automatically creates a corresponding unique clustered index.

  7. www.mssqltips.com › sqlservertip › 7340Create Table SQL Server with Foreign Key Constraints

    9 Αυγ 2022 · Learn how to create and link tables in a SQL Server database using foreign key constraints to ensure data integrity.

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