Why does MySQL allow to update a NOT NULL column to NULL?

Question

I\'m running MySql in ubuntu 10.10. I created a table called \'employee\' having 3 field names empno, name and salary

Answer 1

You must not have SQL_MODE set to strict on you ubuntu installation.

Issue

SET SQL_MODE='STRICT_ALL_TABLES'

or add

SQL_MODE='STRICT_ALL_TABLES'

under [mysqld] to your my.cnf on Ubuntu.