MySQL에서 날짜/시간에 30분을 추가하는 방법은 무엇입니까?

select date_add(yourColumnName,interval 30 minute) from yourTableName;

mysql> create table Add30MinutesDemo
   −> (
   −> YourTime datetime
   −> );
Query OK, 0 rows affected (0.67 sec)

mysql> insert into Add30MinutesDemo values(now());
Query OK, 1 row affected (0.21 sec)

mysql> select *from Add30MinutesDemo;

+---------------------+
| YourTime            |
+---------------------+
| 2018-12-07 18:03:51 |
+---------------------+
1 row in set (0.00 sec)

mysql> select date_add(YourTime,interval 30 minute) from Add30MinutesDemo;

+---------------------------------------+
| date_add(YourTime,interval 30 minute) |
+---------------------------------------+
| 2018-12-07 18:33:51                   |
+---------------------------------------+
1 row in set (0.00 sec)