SET ? DECLARE

 

http://dev.mysql.com/doc/refman/5.7/en/declare-local-variable.html

http://dev.mysql.com/doc/refman/5.7/en/set-variable.html

 

SET Syntax for Variable Assignment

 Local Variable DECLARE Syntax

var_name
var_name
type
value
variable_assignment
variable_assignment
variable_assignment
user_var_name
expr
param_name
expr
local_var_name
expr
system_var_name
expr
system_var_name
expr

SET syntax for variable assignment enables you to assign values to different types of variables that affect the operation of the server or clients:

 
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