Insert value “0” for primary keys with auto increment in MySQL

In order to insert value 0 in a field that is set as primary key for a MySQL table you need to execute the following query prior to any insert query:

Now you can successfully run the insert query with 0 set as value for a primary key, without getting any error message.

Mentioning the “SESSION” variable will make sure that you do not change the sql mode globally, but if you really want to change it globally you need to execute:


Disable foreign key checks in MySQL

Disabling foreign key checks in MySQL is usefull when you are dealing with tables that use foreign keys (InnoDB engine).

You can not delete (drop) multiple tables, a parent table or a child table until you disable foreign key checks four your current database.

The sql command to disable foreign key checks is:


To  enable the foreign key checks use the opposite command: