MYSQL - 테이블 수정

테이블 수정

필드 추가하기

ALTER TABLE 테이블명 ADD 추가할 필드명 AFTER 필드명 위치;

ALTER TABLE myMember ADD youGender enum('m', 'w', 'x') default 'x' comment "남성은 m, 여성은 w" AFTER youBirth;

desc mymember;
+------------+-------------------+------+-----+---------+----------------+
| Field      | Type              | Null | Key | Default | Extra          |
+------------+-------------------+------+-----+---------+----------------+
| myMemberID | int(10) unsigned  | NO   | PRI | NULL    | auto_increment |
| youEmail   | varchar(40)       | NO   |     | NULL    |                |
| youName    | varchar(12)       | NO   |     | NULL    |                |
| youPass    | varchar(20)       | NO   |     | NULL    |                |
| youBirth   | varchar(12)       | NO   |     | NULL    |                |
| youGender  | enum('m','w','x') | YES  |     | x       |                |
| regTime    | int(11)           | NO   |     | NULL    |                |
+------------+-------------------+------+-----+---------+----------------+
7 rows in set (0.00 sec)

필드 수정하기

ALTER TABLE 테이블명 MODIFY 수정할 필드명

mysql> desc mymember2;

+------------+------------------+------+-----+---------+----------------+
| Field      | Type             | Null | Key | Default | Extra          |
+------------+------------------+------+-----+---------+----------------+
| myMemberID | int(10) unsigned | NO   | PRI | NULL    | auto_increment |
| youName    | varchar(12)      | NO   |     | NULL    |                |
+------------+------------------+------+-----+---------+----------------+
2 rows in set (0.00 sec)

mysql> ALTER TABLE mymember2 MODIFY youName int(20);
Query OK, 0 rows affected (0.04 sec)
Records: 0  Duplicates: 0  Warnings: 0

mysql> desc mymember2;

+------------+------------------+------+-----+---------+----------------+
| Field      | Type             | Null | Key | Default | Extra          |
+------------+------------------+------+-----+---------+----------------+
| myMemberID | int(10) unsigned | NO   | PRI | NULL    | auto_increment |
| youName    | int(20)          | YES  |     | NULL    |                |
+------------+------------------+------+-----+---------+----------------+
2 rows in set (0.00 sec)

필드 삭제하기

ALTER TABLE 테이블명 drop 삭제할 필드명

mysql> ALTER TABLE mymember2 drop youGender;
Query OK, 0 rows affected (0.04 sec)
Records: 0  Duplicates: 0  Warnings: 0

mysql> desc mymember2;
+------------+------------------+------+-----+---------+----------------+
| Field      | Type             | Null | Key | Default | Extra          |
+------------+------------------+------+-----+---------+----------------+
| myMemberID | int(10) unsigned | NO   | PRI | NULL    | auto_increment |
| youEmail   | varchar(40)      | NO   |     | NULL    |                |
| youName    | varchar(12)      | NO   |     | NULL    |                |
| youPass    | varchar(20)      | NO   |     | NULL    |                |
| youBirth   | varchar(12)      | NO   |     | NULL    |                |
| youAddress | varchar(30)      | NO   |     | NULL    |                |
| youAge     | int(2)           | NO   |     | NULL    |                |
| regTime    | int(11)          | NO   |     | NULL    |                |
+------------+------------------+------+-----+---------+----------------+
8 rows in set (0.00 sec)