Comments on: SQL Check Constraints on MySQL Databases

By: Jed

Jed — Thu, 29 Dec 2011 21:38:40 +0000

I commented on http://jordanhall.co.uk/general-articles/sql-check-constraints-not-supported-in-mysql-2204849/comment-page-1/#comment-43019 also, but in MySQL you do this with enum data type.

By: SQL Check Constraints not supported in MySQL | Jordan Hall

SQL Check Constraints not supported in MySQL | Jordan Hall — Sat, 10 Apr 2010 16:12:25 +0000

[...] previously wrote about using SQL check constraints in MySQL. It seems however that the MySQL relational database management system (RDBMS) does not actually [...]

By: Matar

Matar — Tue, 02 Mar 2010 12:59:33 +0000

MySQL accepts this, but ignores it.

I tried your Persons example. It worked.
I did: INSERT INTO Persons (P_Id, LastName, FirstName, Address, City) VALUES (‘-1′, ‘ln’, ‘fn’, ‘a’, ‘c’);
It also worked.

MySQL ignores CHECKs…

“The CHECK value is not available until we support CHECK.”
http://dev.mysql.com/doc/refman/5.1/en/table-constraints-table.html