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Sort in MySQL and increment value?
You can use update command along with a user-defined variable. Let us first create a table −
mysql> create table DemoTable ( FirstName varchar(20), Position int ); Query OK, 0 rows affected (0.71 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values('Chris',100);
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable values('Robert',120);
Query OK, 1 row affected (0.23 sec)
mysql> insert into DemoTable values('David',130);
Query OK, 1 row affected (0.16 sec)Following is the query to display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+-----------+----------+ | FirstName | Position | +-----------+----------+ | Chris | 100 | | Robert | 120 | | David | 130 | +-----------+----------+ 3 rows in set (0.00 sec)
Following is the query to sort field and increment value by 10 −
mysql> SET @myPosition := 100; Query OK, 0 rows affected (0.00 sec) mysql> update DemoTable set Position = @myPosition:=@myPosition+10 ORDER BY Position; Query OK, 1 row affected (0.17 sec) Rows matched: 3 Changed: 1 Warnings: 0
Let us check the records once again from the table: mysql> select *from DemoTable -
This will produce the following output −
+-----------+----------+ | FirstName | Position | +-----------+----------+ | Chris | 110 | | Robert | 120 | | David | 130 | +-----------+----------+ 3 rows in set (0.00 sec)
Updated on: 30-Jul-2019
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