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How to GROUP BY in a select query on positive or negative values?
Following is the syntax to GROUP BY in a select query on positive or negative values:
select *from yourTableName group by -yourColumnName;
Let us first create a table:
mysql> create table DemoTable (Value int); Query OK, 0 rows affected (0.60 sec)
Following is the query to insert some records in the table using insert command:
mysql> insert into DemoTable values(-10); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values(-20); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values(20); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(10); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(-10); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(-10); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values(-20); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values(-30); Query OK, 1 row affected (0.07 sec) mysql> insert into DemoTable values(30); Query OK, 1 row affected (0.12 sec)
Following is the query to display records from the table using select command:
mysql> select *from DemoTable;
This will produce the following output
+-------+ | Value | +-------+ | -10 | | -20 | | 20 | | 10 | | -10 | | -10 | | -20 | | -30 | | 30 | +-------+ 9 rows in set (0.00 sec)
Following is the query to group by positive and negative values:
mysql> select *from DemoTable group by -Value;
This will produce the following output
+-------+ | Value | +-------+ | -10 | | -20 | | 20 | | 10 | | -30 | | 30 | +-------+ 6 rows in set (0.00 sec)
Updated on: 30-Jul-2019
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