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SET only two values for all the rows in a MySQL table based on conditions?
For condition based update, use UPDATE and IF(). Let us first create a table −
mysql> create table DemoTable ( Value int ); Query OK, 0 rows affected (0.47 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values(10); Query OK, 1 row affected (0.08 sec) mysql> insert into DemoTable values(20); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values(10); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values(20); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values(30); Query OK, 1 row affected (0.10 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+-------+ | Value | +-------+ | 10 | | 20 | | 10 | | 20 | | 30 | +-------+ 5 rows in set (0.00 sec)
Following is the query to update based on a condition −
mysql> update DemoTable set Value=if(Value=10,20,10); Query OK, 5 rows affected (0.20 sec) Rows matched: 5 Changed: 5 Warnings: 0
Let us check the table records once again −
mysql> select *from DemoTable;
This will produce the following output −
+-------+ | Value | +-------+ | 20 | | 10 | | 20 | | 10 | | 10 | +-------+ 5 rows in set (0.00 sec)
Updated on: 03-Oct-2019
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