Name Skill TotalWorkTime Date A S1 3 01/03/2014 B S1 4 01/03/2014 A S2 5 01/03/2014 B S2 6 01/03/2014 A S2 5 02/03/2014 B S2 6 02/03/2014
select count(TotalWorkTime) from()T group by Skill.
var
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