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Is there a way to convert Integer field into Varchar without losing data in MySQL?
You can use ALTER command to convert Integer into Varchar. Let us first create a table
mysql> create table DemoTable ( UserId int, UserFirstName varchar(20), UserLastName varchar(20), UserAge int ); Query OK, 0 rows affected (0.73 sec)
Now check the description of table using DESC command:
mysql> desc DemoTable;
This will produce the following output −
+---------------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +---------------+-------------+------+-----+---------+-------+ | UserId | int(11) | YES | | NULL | | | UserFirstName | varchar(20) | YES | | NULL | | | UserLastName | varchar(20) | YES | | NULL | | | UserAge | int(11) | YES | | NULL | | +---------------+-------------+------+-----+---------+-------+ 4 rows in set (0.17 sec)
Now you can change the integer data type to varchar without losing data:
mysql> alter table DemoTable change UserId UserId varchar(20); Query OK, 0 rows affected (1.35 sec) Records: 0 Duplicates: 0 Warnings: 0
Check the table description:
mysql> desc DemoTable;
This will produce the following output −
+---------------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +---------------+-------------+------+-----+---------+-------+ | UserId | varchar(20) | YES | | NULL | | | UserFirstName | varchar(20) | YES | | NULL | | | UserLastName | varchar(20) | YES | | NULL | | | UserAge | int(11) | YES | | NULL | | +---------------+-------------+------+-----+---------+-------+ 4 rows in set (0.00 sec)
Updated on: 30-Jul-2019
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