Column values on multiple rows can be updated in a single UPDATE statement if the condition specified in WHERE clause matches multiple rows. In this case, the SET clause will be applied to all the matched rows.
Suppose we have a table ‘tender’ as follows −
mysql> Select * from tender; +-----------+---------+------+ | tender_id | company | rate | +-----------+---------+------+ | 200 | ABC | 1000 | | 300 | ABD | 5000 | | 301 | ABE | 6000 | | 302 | ABF | 2500 | | 303 | ABG | 2600 | +-----------+---------+------+ 5 rows in set (0.00 sec)
Now if we want to update the ‘rate’ column where tender_id is greater than or equal to 300 then we can use the following query −
mysql> UPDATE tender SET rate = rate + 1000 WHERE tender_id >= 300; Query OK, 4 rows affected (0.07 sec) Rows matched: 4 Changed: 4 Warnings: 0 mysql> Select * from tender; +-----------+---------+------+ | tender_id | company | rate | +-----------+---------+------+ | 200 | ABC | 1000 | | 300 | ABD | 6000 | | 301 | ABE | 7000 | | 302 | ABF | 3500 | | 303 | ABG | 3600 | +-----------+---------+------+ 5 rows in set (0.00 sec)
We can observe from the above result set that the values in multiple rows, having tender_id >= 300, has been updated.