CREATE FUNCTION ufn_DataTypeToStyle( @data_type nvarchar(100) )
RETURNS nvarchar(100)
AS
BEGIN
    RETURN
    CASE WHEN @data_type = 'foo' /*in ('char', 'varchar', 'nvarchar')*/ THEN ''
    ELSE WHEN @data_type = 'bar' /*in ('number','numeric')*/ THEN ''
    ELSE ''
    END
END