To create a table ... primary or foreign key constraint, you need to use the ALTER TABLE statement and specify the name of the table and the constraint. To modify a constraint, you can use the ADD ...

Adding a primary key using ALTER Command: Alter command is generally used to modify table . It can be used to add columns or to remove columns. Using Alter command we can also add or remove a key from ...

It adopts the ability of cockroachdb#86071 to drop the `rowid` column along the way. Release note (sql change): When running `ALTER TABLE ... ADD PRIMARY KEY` or `ALTER TABLE ... ADD CONSTRAINT ...

ALTER TABLE customer ADD CONSTRAINT pk_customer PRIMARY KEY USING INDEX pk_customer; ALTER TABLE lineitem ADD CONSTRAINT pk_lineitem PRIMARY KEY USING INDEX pk_lineitem; ALTER TABLE nation ADD ...

Cascading referential integrity constraints are foreign key constraints that tell SQL Server to perform ... tables that were related to the primary key table. Let’s look at how these constraints ...