SET var TO 'val'
SET var TO 'val'
SET var TO DEFAULT
SET var TO DEFAULT
SET TIME ZONE 'val'
SET TIME ZONE 'val'
SET TIME ZONE 
SET TIME ZONE 
SET LOCAL TIME ZONE 
SET TIME ZONE 
SET var FROM CURRENT
SET XML OPTOIN DOCUMENT
SET XML OPTOIN CONTENT
syntax error: show 'x';
SHOW x
SHOW ALL
RESET x
RESET ALL
RESET TIME ZONE 
RESET TRANSACTION ISOLATION LEVEL
RESET SESSION AUTHORIZATION 
syntax error: reset 'x';