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Swap data between two columns in MySQL?
To swap data between two columns in MySQL, use the concept of variable. Let us first create a table. Here, we will swap Name1 with Name2 −
mysql> create table DemoTable -> ( -> Name1 varchar(100), -> Name2 varchar(100) -> ); Query OK, 0 rows affected (0.58 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values('John Smith','Chris Brown');
Query OK, 1 row affected (0.10 sec)
mysql> insert into DemoTable values('David Miller','Jone Doe');
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 −
+--------------+-------------+ | Name1 | Name2 | +--------------+-------------+ | John Smith | Chris Brown | | David Miller | Jone Doe | +--------------+-------------+ 2 rows in set (0.00 sec)
Following is the query to swap data between two columns in MySQL −
mysql> update DemoTable -> SET Name1=(@tmpName:=Name1), Name1 = Name2, Name2 = @tmpName; Query OK, 2 rows affected (0.13 sec) Rows matched: 2 Changed: 2 Warnings: 0
Let us check table records once again −
mysql> select *from DemoTable;
Output
This will produce the following output −
+-------------+--------------+ | Name1 | Name2 | +-------------+--------------+ | Chris Brown | John Smith | | Jone Doe | David Miller | +-------------+--------------+ 2 rows in set (0.00 sec)
Updated on: 30-Jun-2020
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