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select case @parameter WHEN 1 then f1 WHEN 2 THEN f2 WHEN 3 THEN f3 END as field from mytable
however, the data types must be equivalent (or be made equivalent with CONVERT() .. )
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declare @parameter as int
set @parameter = 2
WHEN 1 then col1
WHEN 2 THEN col2
WHEN 3 THEN col3
END as field
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