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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 modę 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 database servers. You can set the default SQL modę by starting mysqld with the —sql-

mode="mode_vaiue" [456]

option. You can also change the modę at runtime by setting the sql_mode [557] system variable with

a SET [GLOBALI SESSION] sql_mode='mode_value’ Statement.

For morę information on setting the SQL modę, see Section 5.1.7, “Server SQL Modes”.