Which SQL statement is commonly used for testing the integrity of primary keys in a table?
- ALTER TABLE ... ADD CONSTRAINT ... PRIMARY KEY
- ASSERT
- CHECK
- VALIDATE
The SQL statement commonly used for testing the integrity of primary keys in a table is "ALTER TABLE ... ADD CONSTRAINT ... PRIMARY KEY". This statement is used to add a primary key constraint to a table, ensuring that the specified column(s) uniquely identify each row and enforcing data integrity. By adding a primary key constraint, it becomes impossible to insert duplicate or null values into the primary key column(s), thus maintaining the integrity of the data.
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