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SELECT CASE 
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	WHEN t.Name = 'Foo' THEN 'Bar'
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	WHEN t.Name = 'Bar' THEN 'Foo'
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	ELSE t.NAME
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FROM ( SELECT LEFT(Name, CHARINDEX('.', Name) - 1) FROM Computers ) t
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FROM ( SELECT Name = LEFT(Name, CHARINDEX('.', Name) - 1) FROM Computers ) t