5 刪除資料

delete from table_name [where ];

table_name表示要執行刪除操作的表；[where ]為可選引數，用於指定刪除條件，如果沒有where子句，delete語句將刪除表中所有記錄。

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)

刪除：

mysql> delete from person where id=11;
query ok, 1 row affected (0.19 sec)

刪除後：

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)

例：

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)

刪除：

mysql> delete from person where age between 19 and 22;
query ok, 4 rows affected (0.07 sec)

刪除後：

mysql> select * from person where age between 19 and 22;
empty set (0.00 sec)

例：刪除person表中所有記錄：

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)

刪除：

mysql> delete from person;
query ok, 5 rows affected (0.02 sec)

刪除後：

mysql> select * from person;
empty set (0.00 sec)

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