Can you have a foreign key reference multiple tables?

Can you have a foreign key reference multiple tables?

A Foreign Key is a database key that is used to link two tables together. The FOREIGN KEY constraint differs from the PRIMARY KEY constraint in that, you can create only one PRIMARY KEY per each table, with the ability to create multiple FOREIGN KEY constraints in each table by referencing multiple parent table.

How link two tables using primary and foreign key in SQL?

Using SQL Server Management Studio

1. In Object Explorer, right-click the table that will be on the foreign-key side of the relationship and click Design.
2. From the Table Designer menu, click Relationships.
3. In the Foreign-key Relationships dialog box, click Add.
4. Click the relationship in the Selected Relationship list.

How to set up primary and foreign keys referencing two?

Msg 142, Level 15, State 2, Line 2 Incorrect syntax for definition of the ‘TABLE’ constraint. Please advise. The actual error message you are getting is because your CREATE TABLE statement is malformed as you cannot have a foreign key refer to more than one table.

How to create a table with foreign key?

So, the referencing table had two foreign key columns, and also it had a constraint to guarantee that exactly one table (not both, not neither) was referenced by a single row. CREATE TABLE dbo. [Group] ( ID int NOT NULL CONSTRAINT PK_Group PRIMARY KEY, Name varchar (50) NOT NULL ); CREATE TABLE dbo.

Can a FOREIGN KEY constraint reference the same table?

FOREIGN KEY constraints can reference only tables within the same database on the same server. Cross-database referential integrity must be implemented through triggers. For more information, see CREATE TRIGGER.

Why do we have a primary and foreign key in SQL?

Both the Primary and the foreign key are SQL constraints. Constraints in SQL help us to manage the data and avoid any invalid transactions on it. The primary key is limited to a single table and is put to uniquely identify the corresponding rows of a table. When we talk about Foreign key, we can have as many Foreign keys as we want.