Chapter 6, Problem 8SCG

Program Plan Intro

ALTER TABLE Statement:

• “ALTER TABLE” statement comes under Data Definition Language.
• It is used to modify column, add constraints, add column(s), drop column, rename column name and table name, drop constraints, and so on.

Syntax:

The Syntax to drop constraint is as follows:

ALTER TABLE table_Name ADD CONSTRAINT constraintName;

UPDATE command:

• The “UPDATE” command is employed to update information present in a table.
• It is always used with “SET” keyword either in bulk or individually.

Syntax for update the value in the table is given as follows:

The Syntax for update the value in the table is given below:

UPDATE table_name

SET column1 = data1, column2 = data2, ...

WHERE condition;