Question

删除或截断表会重置计数器（AUTO_INCREMENT），但删除所选行（使用WHERE子句）不会重置计数器。

我希望它从删除行的位置继续。

有没有办法重置柜台？请按照以下示例进行更好的理解。

mysql> create table dummy(id int NOT NULL AUTO_INCREMENT PRIMARY KEY);
Query OK, 0 rows affected (2.09 sec)

mysql> insert into dummy values (),(),(),(),(),();
Query OK, 6 rows affected (0.19 sec)
Records: 6  Duplicates: 0  Warnings: 0

mysql> select * from dummy;
+----+
| id |
+----+
|  1 |
|  2 |
|  3 |
|  4 |
|  5 |
|  6 |
+----+
6 rows in set (0.00 sec)

mysql> delete from dummy where id>4;
Query OK, 2 rows affected (0.23 sec)

mysql> select * from dummy;
+----+
| id |
+----+
|  1 |
|  2 |
|  3 |
|  4 |
+----+
4 rows in set (0.00 sec)

mysql> insert into dummy values (),(),(),(),(),();
Query OK, 6 rows affected (0.18 sec)
Records: 6  Duplicates: 0  Warnings: 0

mysql> select * from dummy;
+----+
| id |
+----+
|  1 |
|  2 |
|  3 |
|  4 |
|  7 |
|  8 |
|  9 |
| 10 |
| 11 |
| 12 |
+----+
10 rows in set (0.00 sec)

我想要的是什么：

+----+
| id |
+----+
|  1 |
|  2 |
|  3 |
|  4 |
|  5 |
|  6 |
|  7 |
|  8 |
|  9 |
| 10 |
+----+

Answer 1

我们可以在删除语句后查询alter table dummy AUTO_INCREMENT=1;;

因此，只要我们向表中添加新值，它就会检查现有表，从0开始分配给id的值，并指定一个比max id大1的值。该表。

所以，它会像：

mysql> delete from dummy where id>4;
Query OK, 2 rows affected (0.14 sec)

mysql> select * from dummy;
+----+
| id |
+----+
|  1 |
|  2 |
|  3 |
|  4 |
+----+
4 rows in set (0.00 sec)

mysql> alter table dummy AUTO_INCREMENT=1;
Query OK, 0 rows affected (0.21 sec)
Records: 0  Duplicates: 0  Warnings: 0

mysql> insert into dummy values (),(),(),(),(),();
Query OK, 6 rows affected (0.18 sec)
Records: 6  Duplicates: 0  Warnings: 0

我们将按顺序进行：

select * from dummy;
+----+
| id |
+----+
|  1 |
|  2 |
|  3 |
|  4 |
|  5 |
|  6 |
|  7 |
|  8 |
|  9 |
| 10 |
+----+

谢谢@jspcal

mysql：删除行后重置计数器

1 个答案: