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Here is another approach: SELECT di.name, di.date, x.field, x.oldValue, x.newValue FROM @diffInput AS di LEFT JOIN dbo.myTable AS mt ON mt.version = @version AND mt.name = di.name AND mt.date = di.date CROSS APPLY ( SELECT 'fieldA', mt.fieldA, di.fieldA WHERE NOT EXISTS (SELECT mt.fieldA ...


Edit regarding fields having different types, not just decimal. You can try to use sql_variant type. I never used it personally, but it may be a good solution for your case. To try it just replace all [decimal](38, 10) with sql_variant in the SQL script. The query itself remains exactly as it is, no explicit conversion is needed for performing the ...

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