Hi,
The syntaxe is here, but the constraints seems not to be checked. Is this a bug
? i don't know !
mysql> create table employee (
-> name varchar(30),
-> salary numeric(10,2),
-> constraint check (salary > 0)
-> );
Query OK, 0 rows affected (0.22 sec)
mysql>
mysql>
mysql> desc employee
-> ;
+--------+---------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+--------+---------------+------+-----+---------+-------+
| name | varchar(30) | YES | | NULL | |
| salary | decimal(10,2) | YES | | NULL | |
+--------+---------------+------+-----+---------+-------+
2 rows in set (0.03 sec)
mysql> insert into employee value('name 1',0),('name 2',1000)
-> ;
Query OK, 2 rows affected (0.05 sec)
Records: 2 Duplicates: 0 Warnings: 0
mysql> select * from employee;
+--------+---------+
| name | salary |
+--------+---------+
| name 1 | 0.00 |
| name 2 | 1000.00 |
+--------+---------+
2 rows in set (0.02 sec)
Not null is checked :
mysql> insert into employee value('name 1',null);
ERROR 1048 (23000): Column 'salary' cannot be null
But not a not '0' check constraint.
Mathias
Selon Rhino <[EMAIL PROTECTED]>:
> Are you sure this kind of constraint is supported in MySQL 4.1?
>
> I'm not saying they aren't, I just don't remember. Unless you're sure they
> are, you should check the manual.
>
> Rhino
>
> ----- Original Message -----
> From: "Rodrigo Sakai" <[EMAIL PROTECTED]>
> To: <mysql@lists.mysql.com>
> Sent: Friday, May 20, 2005 6:49 PM
> Subject: constraints
>
>
> Hi, I need to do a constraint that checks if the field 'salary' of one
> table is not smaller than zero. Like:
>
> create table employee (
>
> name varchar(30),
> salary numeric(10,2)
>
> constraint ck_salary check (salary > 0)
> );
>
> What´s the sintaxe? I'am not finding the correct sintaxe to do this
> constraint.
>
> I'm using MySQL 4.1
>
>
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