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 13.1.2 `DO' Syntax
 ------------------
 
      DO EXPR [, EXPR] ...
 
 `DO' executes the expressions but doesn't return any results.  This is
 shorthand for `SELECT EXPR, ...', but has the advantage that it's
 slightly faster when you don't care about the result.
 
 `DO' is useful mainly with functions that have side effects, such as
 `RELEASE_LOCK()'.
 
 `DO' was added in MySQL 3.23.47.
 

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