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How to swap a specific field value in MySQL?
Let us first create a table −
mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Number1 int, Number2 int ); Query OK, 0 rows affected (0.68 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable(Number1,Number2) values(10,30); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable(Number1,Number2) values(60,50); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable(Number1,Number2) values(110,100); Query OK, 1 row affected (0.10 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable;
This will produce the following output −
+----+---------+---------+ | Id | Number1 | Number2 | +----+---------+---------+ | 1 | 10 | 30 | | 2 | 60 | 50 | | 3 | 110 | 100 | +----+---------+---------+ 3 rows in set (0.00 sec)
Let us now swap a specific field value in MySQL. Here, we are swapping the fields “Number1” and “Number2” with Id=2 −
mysql> update DemoTable set Number1=(@temporaryVariable:=Number1), Number1=Number2, Number2=@temporaryVariable where Id=2; Query OK, 1 row affected (0.21 sec) Rows matched: 1 Changed: 1 Warnings: 0
Let us check the table records once again −
mysql> select *from DemoTable;
This will produce the following output −
+----+---------+---------+ | Id | Number1 | Number2 | +----+---------+---------+ | 1 | 10 | 30 | | 2 | 50 | 60 | | 3 | 110 | 100 | +----+---------+---------+ 3 rows in set (0.00 sec)
Updated on: 03-Oct-2019
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