MySQL UPDATE Statement

Update Statement is used to change the data in table. Here we are using EMPLOYEE table which is created using Create EMPLOYEE Table

Syntax:

update table_name set column_name=new_value where columname=old_value;

+-------+--------+-----------+------+---------------------+---------+---------+--------+ | EMPNO | ENAME | JOB | MGR | HIREDATE | SAL | COMM | DEPTNO | +-------+--------+-----------+------+---------------------+---------+---------+--------+ | 7369 | SMITH | CLERK | 7902 | 1980-12-17 00:00:00 | 800.00 | NULL | 20 | | 7499 | ALLEN | SALESMAN | 7698 | 1981-02-28 00:00:00 | 1600.00 | 300.00 | 30 | | 7521 | WARD | SALESMAN | 7698 | 1981-02-22 00:00:00 | 1250.00 | 500.00 | 30 | | 7566 | JONES | MANAGER | 7839 | 1981-04-02 00:00:00 | 2975.00 | NULL | 20 | | 7654 | MARTIN | SALESMAN | 7698 | 1981-09-28 00:00:00 | 1250.00 | 1400.00 | 30 | | 7698 | BLAKE | MANAGER | 7839 | 1981-05-01 00:00:00 | 2850.00 | NULL | 30 | | 7782 | CLARK | MANAGER | 7839 | 1981-06-09 00:00:00 | 2450.00 | NULL | 10 | | 7788 | SCOTT | ANALYST | 7566 | 1982-12-09 00:00:00 | 3000.00 | NULL | 20 | | 7839 | KING | PRESIDENT | NULL | 1981-11-17 00:00:00 | 5000.00 | NULL | 10 | | 7844 | TURNER | SALESMAN | 7698 | 1981-09-08 00:00:00 | 1500.00 | 0.00 | 30 | | 7876 | ADAMS | CLERK | 7788 | 1983-01-12 00:00:00 | 1100.00 | NULL | 20 | | 7900 | JAMES | CLERK | 7698 | 1981-12-03 00:00:00 | 950.00 | NULL | 30 | | 7902 | FORD | ANALYST | 7566 | 1981-12-03 00:00:00 | 3000.00 | NULL | 20 | | 7934 | MILLER | CLERK | 7782 | 1982-01-23 00:00:00 | 1300.00 | NULL | 10 | +-------+--------+-----------+------+---------------------+---------+---------+--------+

MySQL Update Statement

Examples: We are using above table for update statement.

1). Change the employee ‘SMITH’ salary to 1000.

mysql> update EMP set SAL=1000 WHERE ename='SMITH'; Query OK, 1 row affected (0.17 sec) mysql> select * from EMP where ename='SMITH'; +-------+-------+-------+------+---------------------+---------+------+--------+ | EMPNO | ENAME | JOB | MGR | HIREDATE | SAL | COMM | DEPTNO | +-------+-------+-------+------+---------------------+---------+------+--------+ | 7369 | SMITH | CLERK | 7902 | 1980-12-17 00:00:00 | 1000.00 | NULL | 20 | +-------+-------+-------+------+---------------------+---------+------+--------+

2). Increase the salary by 10% for all CLERKS.

mysql> update EMP set SAL=SAL*1.1 WHERE JOB='CLEARK'; Query OK, 4 rows affected (0.11 sec) Rows matched: 4 Changed: 4 Warnings: 0 mysql> select * from EMP; +-------+--------+-----------+------+---------------------+---------+---------+--------+ | EMPNO | ENAME | JOB | MGR | HIREDATE | SAL | COMM | DEPTNO | +-------+--------+-----------+------+---------------------+---------+---------+--------+ | 7369 | SMITH | CLERK | 7902 | 1980-12-17 00:00:00 | 880.00 | NULL | 20 | | 7499 | ALLEN | SALESMAN | 7698 | 1981-02-28 00:00:00 | 1600.00 | 300.00 | 30 | | 7521 | WARD | SALESMAN | 7698 | 1981-02-22 00:00:00 | 1250.00 | 500.00 | 30 | | 7566 | JONES | MANAGER | 7839 | 1981-04-02 00:00:00 | 2975.00 | NULL | 20 | | 7654 | MARTIN | SALESMAN | 7698 | 1981-09-28 00:00:00 | 1250.00 | 1400.00 | 30 | | 7698 | BLAKE | MANAGER | 7839 | 1981-05-01 00:00:00 | 2850.00 | NULL | 30 | | 7782 | CLARK | MANAGER | 7839 | 1981-06-09 00:00:00 | 2450.00 | NULL | 10 | | 7788 | SCOTT | ANALYST | 7566 | 1982-12-09 00:00:00 | 3000.00 | NULL | 20 | | 7839 | KING | PRESIDENT | NULL | 1981-11-17 00:00:00 | 5000.00 | NULL | 10 | | 7844 | TURNER | SALESMAN | 7698 | 1981-09-08 00:00:00 | 1500.00 | 0.00 | 30 | | 7876 | ADAMS | CLERK | 7788 | 1983-01-12 00:00:00 | 1210.00 | NULL | 20 | | 7900 | JAMES | CLERK | 7698 | 1981-12-03 00:00:00 | 1045.00 | NULL | 30 | | 7902 | FORD | ANALYST | 7566 | 1981-12-03 00:00:00 | 3000.00 | NULL | 20 | | 7934 | MILLER | CLERK | 7782 | 1982-01-23 00:00:00 | 1430.00 | NULL | 10 | +-------+--------+-----------+------+---------------------+---------+---------+--------+