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MySQL query to first set negative value in descending order and then positive value in ascending order
For this, you can use UNION. Let us first create a table −
mysql> create table DemoTable -> ( -> Number int -> ); Query OK, 0 rows affected (1.17 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values(10); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable values(100); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(-9); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable values(-190); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(190); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable values(0); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values(140); Query OK, 1 row affected (0.16 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable;
Output
This will produce the following output −
+--------+ | Number | +--------+ | 10 | | 100 | | -9 | | -190 | | 190 | | 0 | | 140 | +--------+ 7 rows in set (0.00 sec)
Following is the query to display negative value in descending order and then positive value in ascending order. Initially, we are displaying 0 −
mysql> (select *from DemoTable where Number=0) -> union -> (select *from DemoTable where Number < 0 order by Number desc) -> union -> (select *from DemoTable where Number > 0 order by Number);
output
This will produce the following output −
+--------+ | Number | +--------+ | 0 | | -9 | | -190 | | 10 | | 100 | | 190 | | 140 | +--------+ 7 rows in set (0.03 sec)
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