SQL UPDATE Statement

The UPDATE Statement is used to modify the existing rows in a table.

The Syntax for SQL UPDATE Command is:

UPDATE table_name 

SET column_name1 = value1, 

column_name2 = value2, ... 

[WHERE condition] 

·         table_name - the table name which has to be updated.

·         column_name1, column_name2.. - the columns that gets changed.

·         value1, value2... - are the new values.

NOTE: In the Update statement, WHERE clause identifies the rows that get affected. If you do not include the WHERE clause, column values for all the rows get affected.

For Example: To update the location of an employee, the sql update query would be like,

UPDATE employee 

SET location ='Mysore' 

WHERE id = 101; 

To change the salaries of all the employees, the query would be,

UPDATE employee 

SET salary = salary + (salary * 0.2);