What are the restrictions on ALTER TABLE?

What can ALTER TABLE clause do?

What does the ALTER TABLE clause do? Explanation: The ALTER TABLE statement is used to add, delete, or modify columns. Explanation: The SQL UPDATE Query is used to modify the existing records in a table. You can use WHERE clause with UPDATE query to update selected rows otherwise all the rows would be affected.

What are restrictions in SQL?

SQL constraints are used to specify rules for the data in a table. Constraints are used to limit the type of data that can go into a table. This ensures the accuracy and reliability of the data in the table. If there is any violation between the constraint and the data action, the action is aborted.

Can we add constraint using ALTER TABLE?

The ADD CONSTRAINT statement is part of ALTER TABLE and can add the following constraints to columns: UNIQUE. CHECK. FOREIGN KEY.

What are the three operations of ALTER TABLE?

SQL | ALTER (ADD, DROP, MODIFY)