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Learn how to use the FOREIGN KEY constraint to link two tables together in SQL. See examples of creating, naming, and dropping FOREIGN KEY constraints in different databases.
22 lip 2024 · 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.
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...
In this tutorial, you will learn how to use the SQL Server foreign key constraint to enforce a link between the data in two tables.
Learn how to use the FOREIGN KEY constraint to prevent actions that would destroy links between tables. See examples of creating, naming and dropping FOREIGN KEY constraints in SQL Server, MySQL, Oracle and MS Access.
Learn what is a foreign key and how to create one in SQL Server using T-SQL or SSMS. A foreign key links a column in a child table to a primary key or unique key in a parent table and enforces referential integrity.
In this tip we look at how to create a SQL Server foreign key using both T-SQL and the SSMS GUI.
