![[PukiWiki]](image/../localimages/Atom.gif "[PukiWiki]")
mysql> select * from ism_shouhin where ID in (10,12,15); +------+---------------+------+--------+------+----------+------+ | ID | name | grp | kakaku | url | status | etc | +------+---------------+------+--------+------+----------+------+ | 10 | ビール 500ml | 201 | 360 | | | | | 12 | 発泡酒 500ml | 201 | 164 | | | | | 15 | ワイン (ロゼ) | 201 | 680 | | 販売終了 | | +------+---------------+------+--------+------+----------+------+ 3 rows in set (0.00 sec)
mysql> select * from ism_shouhin where ID not in (10,12,15); +------+-------------------+------+--------+-----------------+------ | ID | name | grp | kakaku | url | status | etc | +------+-------------------+------+--------+-----------------+------ | 9 | ビール 350ml | 201 | 250 | | | | | 11 | 発泡酒 350ml | 201 | 134 | | | | | 13 | 焼酎 (芋) | 201 | 1048 | | | | | 14 | 焼酎 (麦) | 201 | 1148 | | | | | 16 | ワイン (白) | 201 | 650 | | | | +------+-------------------+------+--------+-----+-----------+-------
mysql> select ID,name as 名前,kakaku as 単価 from ism_shouhin where ID in(10,12,15); +------+---------------+------+ | ID | 名前 | 単価 | +------+---------------+------+ | 10 | ビール 500ml | 360 | | 12 | 発泡酒 500ml | 164 | | 15 | ワイン (ロゼ) | 680 | +------+---------------+------+ 3 rows in set (0.00 sec)
select ism_uriage.* , ism_shouhin.* from ism_uriage join ism_shouhin on ism_uriage.shouhinid=ism_shouhin.ID where ism_uriage.uid=2 order by ism_uriage.ID desc limit 3; +-----+---------------------------+------+-----------+-----------+------+------+ ----------------------------+------+--------+----------------------------------- --------------------------------------------+--------+------+ | ID | date | uid | shouhinid | uriagesuu | etc | ID | name | grp | kakaku | url | status | etc | +-----+---------------------------+------+-----------+-----------+------+------+
----------------------------+------+--------+----------------------------------- --------------------------------------------+--------+------+ | 160 | 2008/10/02 (Thu) 15:52:20 | 2 | 1 | 1 | NULL | 1 | 冷蔵庫 AB-12345（H) | 101 | 45000 | | | | | 159 | 2008/10/02 (Thu) 15:52:20 | 2 | 18 | 4 | NULL | 18 | カクテルバー(レモン) | 201 | 121 | | | | | 158 | 2008/10/02 (Thu) 15:52:20 | 2 | 21 | 2 | NULL | 21 | コンパクトカメラ(Leica C2) | 301 | 37590 | | | | +-----+---------------------------+------+-----------+-----------+------+------+ ----------------------------+------+--------+----------------------------------- --------------------------------------------+--------+------+ 3 rows in set (0.01 sec)
mysql> DROP TABLE IF EXISTS ism_test; Query OK, 0 rows affected, 1 warning (0.00 sec)
mysql> create table if not exists ism_test( ID int8, date varchar(64), etc varchar(64)); Query OK, 0 rows affected (0.02 sec)
型の変更(data)
mysql> show fields from ism_test; +-------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------+-------------+------+-----+---------+-------+ | ID | bigint(20) | YES | | NULL | | | date | varchar(64) | YES | | NULL | | | etc | varchar(64) | YES | | NULL | | +-------+-------------+------+-----+---------+-------+ 3 rows in set (0.01 sec)
mysql> alter table ism_test change date date int8; Query OK, 0 rows affected (0.01 sec) Records: 0 Duplicates: 0 Warnings: 0
mysql> show fields from ism_test; +-------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------+-------------+------+-----+---------+-------+ | ID | bigint(20) | YES | | NULL | | | date | bigint(20) | YES | | NULL | | | etc | varchar(64) | YES | | NULL | | +-------+-------------+------+-----+---------+-------+ 3 rows in set (0.01 sec)
名前の変更(data)
mysql> alter table ism_test change date data varchar(64); Query OK, 0 rows affected (0.01 sec) Records: 0 Duplicates: 0 Warnings: 0
mysql> show fields from ism_test; +-------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------+-------------+------+-----+---------+-------+ | ID | bigint(20) | YES | | NULL | | | data | varchar(64) | YES | | NULL | | | etc | varchar(64) | YES | | NULL | | +-------+-------------+------+-----+---------+-------+ 3 rows in set (0.00 sec)
書式形式
alter table <テーブル名> change <フィールド名> <新フィールド名> <型>
MySQLでは、定義さている値より多い値を入れようとすると、許容範囲まで入る。
dataが4Byte
mysql> show fields from ism_test; +-------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------+-------------+------+-----+---------+-------+ | ID | int(11) | YES | | NULL | | | data | varchar(4) | YES | | NULL | | | etc | varchar(64) | YES | | NULL | | +-------+-------------+------+-----+---------+-------+ 3 rows in set (0.00 sec)
dataに5byte入力してみると4Byteまで入る
mysql> insert into ism_test values(1,'12345','岡田'); Query OK, 1 row affected, 1 warning (0.00 sec)
mysql> select * from ism_test; +------+------+------+ | ID | data | etc | +------+------+------+ | 1 | 1234 | 岡田 | +------+------+------+ 1 row in set (0.00 sec)
mysql> select * from ism_test; +------+------+------+ | ID | data | etc | +------+------+------+ | 1 | 1234 | 岡田 | +------+------+------+ 1 row in set (0.00 sec)
フィールドの型を変更すると矛盾すると値がなくなる （varchar=>int型に変更した場合)
mysql> alter table ism_test change etc etc int4; Query OK, 1 row affected, 1 warning (0.00 sec) Records: 1 Duplicates: 0 Warnings: 1
mysql> select * from ism_test; +------+------+------+ | ID | data | etc | +------+------+------+ | 1 | 1234 | 0 | +------+------+------+ 1 row in set (0.00 sec)
