優化查詢而不使用不在子句中

Question

  Hi i want to write the below query in different way can you please 

告訴我如何以不同方式寫入，因此最少需要 才能執行。不使用index.I書面查詢越來越精確的輸出，但它需要太多的時間

select distinct location from get_shipping_data gsd 
where location not in 

(
select pkd.shipmentlocation from package p 
left join packagedetail pkd on pkd.packingid=p.packingid 
where p.shippingnum='SH0667075' 

) 
and gsd.shipmentid='SH0667075' 

Answer 1

有沒有除了這裏建議多，沒有索引可以使用寫你的查詢聯接：

select distinct location 
    from get_shipping_data gsd 
     inner join 
     (select p.shippingnum, pkd.shipmentlocation 
      from package p 
       left join packagedetail pkd 
       on pkd.packingid=p.packingid 
     where p.shippingnum='SH0667075') ps 
     ON gsd.location = ps.shipmentlocation 
      AND gsd.shipmentid = ps.shippingnum 
where ps.shipmentlocation is null 
    AND gsd.shipmentid='SH0667075' 

嘗試它，看看它是否給你任何改善。