MySQL Reference Manual for version 4.0.18.

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18.1.6.2 Variable SET Statement

 
SET variable = expression [,...]

The SET statement in stored procedures is an extended version of the general SET command. Referenced variables may be ones declared inside a routine, or global server variables.

The SET statement in stored procedures is implemented as part of the pre-existing SET syntax. This allows an extended syntax of SET a=x, b=y, ... where different variable types (locally declared variables, server variables, and global and session server variables) can be mixed. This also allows combinations of local variables and some options that only make sense for global/system variables; in that case the options are accepted but ignored.



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