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Changing data type from date to date/time in MySQL?
To change data type from date to date/time, use alter command.
alter table yourTableName change yourColumnName yourColumnName datetime;
Let us first create a table −
mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, LoginDate date ); Query OK, 0 rows affected (1.26 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable(LoginDate) values('2019-01-21'); Query OK, 1 row affected (0.29 sec) mysql> insert into DemoTable(LoginDate) values('2018-05-01'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable(LoginDate) values('2017-12-31'); Query OK, 1 row affected (0.12 sec)
Display all records from the table using select statement −
mysql> select *from DemoTable;
Output
+----+------------+ | Id | LoginDate | +----+------------+ | 1 | 2019-01-21 | | 2 | 2018-05-01 | | 3 | 2017-12-31 | +----+------------+ 3 rows in set (0.66 sec)
Following is the query to change data type from date to date/time in MySQL −
mysql> alter table DemoTable change LoginDate LoginDate datetime; Query OK, 3 rows affected (1.63 sec) Records : 3 Duplicates : 0 Warnings : 0
Let us check the table description using desc command −
mysql> desc DemoTable;
Output
+-----------+----------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-----------+----------+------+-----+---------+----------------+ | Id | int(11) | NO | PRI | NULL | auto_increment | | LoginDate | datetime | YES | | NULL | | +-----------+----------+------+-----+---------+----------------+ 2 rows in set (0.19 sec)
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