insert autoincrement into second column

问题

I am looking to do a query like so:

id | int | autoincrement something | varchar | 255

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

so that the table ends up looking like

1|val1
2|val2
3|val3...

except that id always ends up being val0 for every row.

How can I do this?

回答1:

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)

来源：https://stackoverflow.com/questions/5972446/insert-autoincrement-into-second-column

标签

mysql

auto-increment