SQL SERVER SP select 條件where加變量

存儲過程中select 　where條件后如果條件關聯變量則可以使用如下代碼，變量允許為空，當為空時則不會執行篩選條件　

 

Select Distinct TR.int_id, TR.vch_pmd  from  table_r   TR 
inner join TABLE_PPT  on TPPT.int_id = TR.int_id 
where   (TPPT.vch_s_code = @in_Code or len(isnull(@in_Code, '')) = 0)