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

    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. learnsql.com › cookbook › how-to-create-a-table-with-a-foreign-key-in-sqlHow to Create a Table with a Foreign Key in SQL

    To create a new table containing a foreign key column that references another table, use the keyword FOREIGN KEY REFERENCES at the end of the definition of that column. Follow that with the name of the referenced table and the name of the referenced column in parentheses.

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

    I always use this syntax to create the foreign key constraint between 2 tables. Alter Table ForeignKeyTable Add constraint `ForeignKeyTable_ForeignKeyColumn_FK` `Foreign key (ForeignKeyColumn)` references `PrimaryKeyTable (PrimaryKeyColumn)` i.e.

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

    The FOREIGN KEY constraint is a key used to link two tables together. 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:

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

    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.

  6. www.mssqltips.com › 7340 › create-table-sql-server-foreign-key-constraintsCreate Table SQL Server with Foreign Key Constraints

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

  7. www.sqltutorial.org › sql-foreign-keyThe Essential Guide To SQL Foreign Key Constraint - SQL Tutorial

    You use the FOREIGN KEY constraint to create a foreign key when you create or alter table. Let’s take a simple example to get a better understanding. SQL FOREIGN KEY constraint examples. See the following projects and project_assignments tables: CREATE TABLE projects ( project_id INT AUTO_INCREMENT PRIMARY KEY, project_name VARCHAR (255),

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