将自动增量插入第二列

一尘不染

将自动增量插入第二列

mysql

我正在寻找这样的查询：

id | int | 自动增量 varchar | 255

insert into `table` set something = concat('val', id);

这样桌子就看起来像

1 | val1
2 | val2
3 | val3 …

除了id总是val0以每一行都结束而已。

我怎样才能做到这一点？

阅读 202

2020-05-17

共1个答案

一尘不染

mysql> describe concattest;
+-------+------------------+------+-----+---------+----------------+
| Field | Type             | Null | Key | Default | Extra          |
+-------+------------------+------+-----+---------+----------------+
| id    | int(10) unsigned | NO   | PRI | NULL    | auto_increment |
| val   | text             | YES  |     | NULL    |                |
+-------+------------------+------+-----+---------+----------------+
2 rows in set (0.00 sec)

mysql> INSERT INTO concattest (val) VALUES (concat('val', LAST_INSERT_ID()));
Query OK, 1 row affected (0.06 sec)

mysql> select * from concattest;
+----+------+
| id | val  |
+----+------+
|  1 | val0 |
+----+------+
1 row in set (0.00 sec)

mysql> INSERT INTO concattest (val) VALUES (concat('val', LAST_INSERT_ID()));
Query OK, 1 row affected (0.00 sec)

mysql> select * from concattest;
+----+------+
| id | val  |
+----+------+
|  1 | val0 |
|  2 | val1 |
+----+------+
2 rows in set (0.00 sec)

mysql> INSERT INTO concattest (val) VALUES (concat('val', LAST_INSERT_ID()));
Query OK, 1 row affected (0.00 sec)

mysql> select * from concattest;
+----+------+
| id | val  |
+----+------+
|  1 | val0 |
|  2 | val1 |
|  3 | val2 |
+----+------+
3 rows in set (0.00 sec)

2020-05-17