Set conditions for columns with values 0 or 1 in MySQL
To set conditions, use CASE WHEN statement in MySQL. Let us first create a table −
mysql> create table DemoTable
-> (
-> Value1 int,
-> Value2 int,
-> Value3 int,
-> Value4 int
-> );
Query OK, 0 rows affected (0.98 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values(1,0,1,1);
Query OK, 1 row affected (0.22 sec)
mysql> insert into DemoTable values(1,0,1,0);
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable values(1,1,1,1);
Query OK, 1 row affected (0.20 sec)
mysql> insert into DemoTable values(0,0,0,0);
Query OK, 1 row affected (0.15 sec)
Display all records from the table using select statement −
mysql> select * from DemoTable;
This will produce the following output −
+--------+--------+--------+--------+
| Value1 | Value2 | Value3 | Value4 |
+--------+--------+--------+--------+
| 1 | 0 | 1 | 1 |
| 1 | 0 | 1 | 0 |
| 1 | 1 | 1 | 1 |
| 0 | 0 | 0 | 0 |
+--------+--------+--------+--------+
4 rows in set (0.00 sec)
Here is the query to set conditions for columns with values 0 or 1 in MySQL−
mysql> select case when Value1+Value2+Value3+Value4 < 2 then 'NotGood' else 'Good' end as Status from DemoTable;
This will produce the following output −
+---------+
| Status |
+---------+
| Good |
| Good |
| Good |
| NotGood |
+---------+
4 rows in set (0.00 sec)
Published on 18-Dec-2019 10:32:10
