['KEYWORD','select'],
['KEYWORD','case'],
['KEYWORD','when'],
['WORD','a'],
'=',
['WORD','b'],
['WORD','then'],
['QUOTED','\'c\''],
['WORD','else'],
['QUOTED','\'d\''],
['KEYWORD','end'],
['DQWORD','"tough_one"'],
['COMMA',','],
['WORD','e'],
['KEYWORD','as'],
['DQUOTED','"even tougher"'],
['KEYWORD','from'],
['WORD','mytable']