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Set MySQL select in a custom variable
Let us first create a table −
mysql> create table DemoTable2013 -> ( -> Name varchar(20) -> ); Query OK, 0 rows affected (0.63 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable2013 values('Chris');
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable2013 values('David');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable2013 values('Mike');
Query OK, 1 row affected (0.19 sec)
mysql> insert into DemoTable2013 values('Sam');
Query OK, 1 row affected (0.10 sec)
mysql> insert into DemoTable2013 values('Bob');
Query OK, 1 row affected (0.12 sec)Display all records from the table using select statement −
mysql> select *from DemoTable2013;
This will produce the following output −
+-------+ | Name | +-------+ | Chris | | David | | Mike | | Sam | | Bob | +-------+ 5 rows in set (0.00 sec)
Here is the query to set MySQL SELECT statement in a custom variable −
mysql> set @query := (select count(*) from DemoTable2013); Query OK, 0 rows affected (0.00 sec) mysql> select Name -> from DemoTable2013 -> where (@query := @query-1) = 0;
This will produce the following output −
+------+ | Name | +------+ | Bob | +------+ 1 row in set (0.00 sec)
Updated on: 06-Apr-2020
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