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 13.2.2 `DO' Syntax
 ------------------
 
      DO EXPR [, EXPR] ...
 
 `DO' executes the expressions but does not return any results. In most
 respects, `DO' is shorthand for `SELECT EXPR, ...', but has the
 advantage that it is slightly faster when you do not care about the
 result. However, `DO' does not report any errors. Instead, it reports
 errors as warnings.
 
 `DO' is useful primarily with functions that have side effects, such as
 `RELEASE_LOCK()'.
 

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