1.9.2. Selecting SQL Modes
The MySQL server can operate in different SQL modes, and can
apply these modes differentially for different clients. This
capability enables each application to tailor the server's
operating mode to its own requirements.
SQL modes control aspects of server operation such as what SQL
syntax MySQL should support and what kind of data validation
checks it should perform. This makes it easier to use MySQL in
different environments and to use MySQL together with other
You can set the default SQL mode by starting
mysqld with the
option. Beginning with MySQL 4.1, you can also change the mode
at runtime by setting the
variable with a
For more information on setting the SQL mode, see
Section 5.2.5, “The Server SQL Mode”.