5 刪除資料

delete from table_name [where ];

例：刪除person表中，id=11的記錄：

刪除前：

mysql> select * from person;

+----+---------+-----+-----------+
| id | name | age | info |
+----+---------+-----+-----------+
| 1 | green | 21 | student |
| 2 | suse | 22 | student |
| 3 | mary | 24 | musician |
| 4 | willam | 20 | student |
| 5 | laura | 25 | null |
| 6 | evans | 27 | secretary |
| 7 | dale | 22 | student |
| 8 | edison | 28 | singer |
| 11 | liming | 15 | student |
| 12 | beckham | 31 | police |
+----+---------+-----+-----------+
10 rows in set (0.00 sec)

mysql> delete from person where id=11;

query ok, 1 row affected (0.19 sec)

mysql> select * from person;

+----+---------+-----+-----------+
| id | name | age | info |
+----+---------+-----+-----------+
| 1 | green | 21 | student |
| 2 | suse | 22 | student |
| 3 | mary | 24 | musician |
| 4 | willam | 20 | student |
| 5 | laura | 25 | null |
| 6 | evans | 27 | secretary |
| 7 | dale | 22 | student |
| 8 | edison | 28 | singer |
| 12 | beckham | 31 | police |
+----+---------+-----+-----------+
9 rows in set (0.00 sec)

在person表中使用delete語句同時刪除多條記錄：

mysql> select * from person where age between 19 and 22;

+----+--------+-----+---------+
| id | name | age | info |
+----+--------+-----+---------+
| 1 | green | 21 | student |
| 2 | suse | 22 | student |
| 4 | willam | 20 | student |
| 7 | dale | 22 | student |
+----+--------+-----+---------+
4 rows in set (0.00 sec)

mysql> delete from person where age between 19 and 22;

query ok, 4 rows affected (0.07 sec)

mysql> select * from person where age between 19 and 22;

empty set (0.00 sec)

刪除前：

mysql> select * from person;

+----+---------+-----+-----------+
| id | name | age | info |
+----+---------+-----+-----------+
| 3 | mary | 24 | musician |
| 5 | laura | 25 | null |
| 6 | evans | 27 | secretary |
| 8 | edison | 28 | singer |
| 12 | beckham | 31 | police |
+----+---------+-----+-----------+
5 rows in set (0.00 sec)

mysql> delete from person;

query ok, 5 rows affected (0.02 sec)

mysql> select * from person;

empty set (0.00 sec)

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