t-sql：学术，寻找更高效/更好的查询方式

Question

这段代码很有用，但它很“老派”地寻找。有没有人有更好的方式来选择和分组在一个单一的查询？基本上，这只是一个通用的设置，包括一个头文件表，一个拾音器子表头，一个用于放置的子头表，以及每个表的详细表。

select h.id 
    ,h.col1 as Customer 
    ,h.col2 as Req 
    ,d.subid as DropId 
    ,d.col1 as DropCity 
    ,d.col2 as DropLoc 
    ,dd.detid as DropDetailId 
    ,dd.col1 as DropSpot 
    ,dd.col2 as DropAWBorPackage 
    ,NULL as PickupId 
    ,NULL as PickUpCity 
    ,NULL as PickUpLoc 
    ,NULL as PickupDetailId 
    ,NULL as PickupLoc 
    ,NULL as PickupAWBorPackage 
from [scratch].GenericHeader h 
    inner join [scratch].GenericSubHeader d on d.id = h.id 
    inner join [scratch].GenericDetail dd on dd.id = h.id 
    and dd.id = d.id 
    and dd.subid = d.subid 
UNION ALL 
    select h.id 
    ,h.col1 as Customer 
    ,h.col2 as Req 
    ,NULL as DropId 
    ,NULL as DropCity 
    ,NULL as DropLoc 
    ,NULL as DropDetailId 
    ,NULL as DropSpot 
    ,NULL as AWBorPackage 
    ,p.sub2id as PickupId 
    ,p.col1 as PickUpCity 
    ,p.col2 as PickUpLoc 
    ,pp.det2id as PickupDetailId 
    ,pp.col1 as PickupLoc 
    ,pp.col2 as PickupAWBorPackage 
    from [scratch].GenericHeader h 
    inner join [scratch].GenericSubHeader2 p on p.id = h.id 
    inner join [scratch].GenericDetail2 pp on pp.id = h.id 
     and pp.id = p.id 
     and pp.sub2id = p.sub2id 
    order by Req,DropId,DropDetailId,PickupId,PickupDetailId 

Answer 1

我不认为有一种方法可以在一个SQL语句中获取相同的数据。您可能想要创建两个SQL查询，一个用于放置数据，另一个用于拾取数据。