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Update column data without using temporary tables in MySQL?
For this, use CASE statement. This will work even without using temporary tables. Let us first create a table −
mysql> create table DemoTable -> ( -> UserName varchar(100), -> UserStatus varchar(100) -> ); Query OK, 0 rows affected (0.74 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable values('John','Active');
Query OK, 1 row affected (0.29 sec)
mysql> insert into DemoTable values('Chris','Inactive');
Query OK, 1 row affected (0.19 sec)
mysql> insert into DemoTable values('Bob','Inactive');
Query OK, 1 row affected (0.32 sec)
mysql> insert into DemoTable values('Robert','Active');
Query OK, 1 row affected (0.15 sec)Display all records from the table using select statement −
mysql> select *from DemoTable;
Output
This will produce the following output −
+----------+------------+ | UserName | UserStatus | +----------+------------+ | John | Active | | Chris | Inactive | | Bob | Inactive | | Robert | Active | +----------+------------+ 4 rows in set (0.00 sec)
Following is the query to update column data using CASE −
mysql> update DemoTable -> set UserStatus=CASE UserStatus WHEN 'Inactive' THEN 'Active' ELSE 'Inactive' END; Query OK, 4 rows affected (0.28 sec) Rows matched: 4 Changed: 4 Warnings: 0
Let us check table records once again −
mysql> select *from DemoTable;
Output
This will produce the following output −
+----------+------------+ | UserName | UserStatus | +----------+------------+ | John | Inactive | | Chris | Active | | Bob | Active | | Robert | Inactive | +----------+------------+ 4 rows in set (0.00 sec)
Updated on: 30-Jun-2020
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