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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 database servers.

You can set the default SQL mode by starting mysqld with the --sql-mode="mode_value" option. Beginning with MySQL 4.1, you can also change the mode at runtime by setting the sql_mode system variable with a SET [SESSION|GLOBAL] sql_mode='mode_value' statement.

For more information on setting the SQL mode, see Section 5.2.5, “The Server SQL Mode”.


 
 
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