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Can we use WHERE clause inside MySQL CASE statement?
For this, use the CASE WHEN statement. Let us first create a table −
mysql> create table DemoTable1040 ( Value1 int, Value2 int, Value3 int ); Query OK, 0 rows affected (0.65 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable1040 values(10,30,1); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable1040 values(40,20,50); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable1040 values(80,90,100); Query OK, 1 row affected (0.11 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable1040;
This will produce the following output −
+--------+--------+--------+ | Value1 | Value2 | Value3 | +--------+--------+--------+ | 10 | 30 | 1 | | 40 | 20 | 50 | | 80 | 90 | 100 | +--------+--------+--------+ 3 rows in set (0.00 sec)
Following is the query to use CASE WHEN −
mysql> select case when (Value1=40 AND Value2=20) then Value2 else Value1 end as selectedValue from DemoTable1040;
This will produce the following output −
+---------------+ | selectedValue | +---------------+ | 10 | | 20 | | 80 | +---------------+ 3 rows in set (0.00 sec)
Updated on: 30-Sep-2019
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