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MySQL query to return TRUE for rows having positive value?
To return TRUE for positive values and FALSE for negative, use MySQL IF(). Let us first create a table −
mysql> create table DemoTable2038 -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Value int -> ); Query OK, 0 rows affected (0.87 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable2038(Value) values(57); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable2038(Value) values(-100);; Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable2038(Value) values(-78); Query OK, 1 row affected (0.42 sec) mysql> insert into DemoTable2038(Value) values(78); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable2038(Value) values(91); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable2038(Value) values(-34); Query OK, 1 row affected (0.14 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable2038;
This will produce the following output −
+----+-------+ | Id | Value | +----+-------+ | 1 | 57 | | 2 | -100 | | 3 | -78 | | 4 | 78 | | 5 | 91 | | 6 | -34 | +----+-------+ 6 rows in set (0.00 sec)
Here is the query to return true for rows that have positive value −
mysql> select *,if(Value > 0,true,false) as Result from DemoTable2038;
This will produce the following output −
+----+-------+--------+ | Id | Value | Result | +----+-------+--------+ | 1 | 57 | 1 | | 2 | -100 | 0 | | 3 | -78 | 0 | | 4 | 78 | 1 | | 5 | 91 | 1 | | 6 | -34 | 0 | +----+-------+--------+ 6 rows in set (0.00 sec)
Updated on: 07-Apr-2020
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