SQL Selects combine - 第二个选择在 Where 子句中

Posted 2023-05-08

【中文标题】SQL Selects combine - 第二个选择在 Where 子句中

【英文标题】：SQL Selects combine - Second select to be in Where clause

【发布时间】：2020-08-16 17:11:59

【问题描述】：

我有 2 个选择。第一个：

select purs.t_orno as purchased
from ttisfc001201 sls
inner join twhinr110201 sfc on sfc.t_orno = sls.t_pdno
inner join twhltc100201 purs on purs.t_clot=sfc.t_clot
left join twhltc220201 items on items.t_clot = sfc.t_clot
left join twhltc210201 cert_num on cert_num.t_item = items.t_item
left join twhltc200201 cert on cert.t_ltft = cert_num.t_ltft
where sls.t_cprj = 'SLS004336' and purs.t_orno like N'PUR%'
and sfc.t_koor = 1 and sfc.t_kost = 5

给了我这些结果：

PUR007833
PUR008544
PUR008698
PUR008963
PUR009048
PUR009304
PUR009611
PUR009912
PUR009913
PUR010006
PUR010110
PUR010400
PUR010465
PUR010539
PUR010664

所以基本上这些是我必须在 where 子句中的第二个选择中使用的结果。第二次选择中表中的字段必须等于其中之一。为了更好地理解我，它应该是这样的：

select distinct fac.t_isup
from ttfacp200201  fac
inner join  ttfacp250201 mid on mid.t_ityp = fac.t_ttyp and mid.t_idoc=fac.t_ninv
where mid.t_orno ='PUR010400' or mid.t_orno='PUR009912'or mid.t_orno='PUR009913'or mid.t_orno='PUR010465'or mid.t_orno='PUR008544'or mid.t_orno='PUR008963'or mid.t_orno='PUR009048'or mid.t_orno='PUR010110'or mid.t_orno='PUR007833'or mid.t_orno='PUR009304'or mid.t_orno='PUR009611'or mid.t_orno='PUR010664'or mid.t_orno='PUR010006'or mid.t_orno='PUR010539'or mid.t_orno='PUR008698'or mid.t_orno='PUR010667'

所有这些 OR 都是第一次选择的结果。我如何组合它们（第一个选择进入第二个 select where 子句）以便我可以立即获得结果？

【参考方案1】：

您可以在第二个查询中使用IN 子句

select distinct fac.t_isup
from ttfacp200201  fac
inner join  ttfacp250201 mid on mid.t_ityp = fac.t_ttyp and mid.t_idoc=fac.t_ninv
where mid.t_orno IN (
    select purs.t_orno 
    from ttisfc001201 sls
    inner join twhinr110201 sfc on sfc.t_orno = sls.t_pdno
    inner join twhltc100201 purs on purs.t_clot=sfc.t_clot
    left join twhltc220201 items on items.t_clot = sfc.t_clot
    left join twhltc210201 cert_num on cert_num.t_item = items.t_item
    left join twhltc200201 cert on cert.t_ltft = cert_num.t_ltft
    where sls.t_cprj = 'SLS004336' and purs.t_orno like N'PUR%'
    and sfc.t_koor = 1 and sfc.t_kost = 5
)

【讨论】：

mid.t_orno 的值将与内部查询结果进行比较，只有匹配的行才会显示在 SELECT 中

【参考方案2】：

类似的东西

;with first_query_cte(purchased) as (
    select purs.t_orno
    from ttisfc001201 sls 
         inner join twhinr110201 sfc on sfc.t_orno = sls.t_pdno
         inner join twhltc100201 purs on purs.t_clot=sfc.t_clot
         left join twhltc220201 items on items.t_clot = sfc.t_clot
         left join twhltc210201 cert_num on cert_num.t_item = items.t_item
         left join twhltc200201 cert on cert.t_ltft = cert_num.t_ltft
    where sls.t_cprj = 'SLS004336' and purs.t_orno like N'PUR%'
          and sfc.t_koor = 1 and sfc.t_kost = 5)
select distinct fac.t_isup
from ttfacp200201  fac
     inner join ttfacp250201 mid on mid.t_ityp = fac.t_ttyp and mid.t_idoc=fac.t_ninv
     inner join first_query_cte fqc on mid.t_orno=fqc.purchased;