Question

我有四个表AG_AGENTS, Px_PAXWEB, vw_POSTCODE, vwPXPaxWeb，字段为AG_AGENTS.SALES_AREA_DESC, Px_Paxweb.COUNTRY, vwPxPaxweb.SALES_AREA, vw_POSTCODE.POSTCODE。

我的查询返回除

之外的所有正确值

When AG_AGENTS ='Dom. -NAT', if Px_PaxWeb.COUNTRY <> 'AUT' then vwPxPaxWeb.SALES_AREA ( returning correct value till here) if vwPxPaxWeb.SALES_AREA IS NULL Then AG_AGENTS.SALES_AREA_DESC
When AG_AGENTS ='Dom. -NAT', if Px_PaxWeb.COUNTRY ='AUT' Then vw_POSTCODE.POSTCODE( returning correct value till here) if vw_POSTCODE.POSTCODE IS NULL Then AG_AGENTS.SALES_AREA_DESC

基本上不返回AG_AGENTS.SALES_AREA_DESC when vw_POSTCODE.POSTCODE IS NULL and not returning AG_AGENTS.SALES_AREA_DESC when vwPxPaxWeb.SALES_AREA IS NULL

我的SQL查询如下

CASE WHEN AG_AGENTS.SALES_AREA_DESC = 'Dom. - NAT' 
THEN (
    CASE WHEN PX_PAXWEB.COUNTRY = 'AUT' THEN vw_POSTCODE.POSTCODE
         WHEN PX_PAXWEB.COUNTRY <> 'AUT' THEN vwPxPaxWeb.SALES_AREA
         ELSE COALESCE (vw_POSTCODE.POSTCODE,vwPxPaxWeb.SALES_AREA,AG_AGENTS.SALES_AREA_DESC) END
)
ELSE 
(
    CASE WHEN AG_AGENTS.SALES_AREA_DESC = 'Int. – Inbound' Then vwPxPaxweb.SALES_AREA
         ELSE COALESCE( vwPxPaxweb.SALES_AREA,AG_AGENTS.SALES_AREA_DESC) END
)
END AS SALES_AREA_DESC_2

Answer 1

我试着按照你的描述。两者似乎都是用ISNULL解决的（如下所示）。但你说这不起作用吗？

CASE WHEN AG_AGENTS.SALES_AREA_DESC = 'Dom. - NAT' 
     THEN CASE
          WHEN PX_PAXWEB.COUNTRY = 'AUT' 
          THEN ISNULL(vw_POSTCODE.POSTCODE, AG_AGENTS.SALES_AREA_DESC) --#2 fix
          WHEN PX_PAXWEB.COUNTRY <> 'AUT' 
          THEN ISNULL(vwPxPaxWeb.SALES_AREA,AG_AGENTS.SALES_AREA_DESC) --#1 fix
          ELSE COALESCE (vw_POSTCODE.POSTCODE,vwPxPaxWeb.SALES_AREA,AG_AGENTS.SALES_AREA_DESC)
          END
     ELSE CASE
          WHEN AG_AGENTS.SALES_AREA_DESC = 'Int. – Inbound'
          THEN vwPxPaxweb.SALES_AREA
          ELSE COALESCE(vwPxPaxweb.SALES_AREA,AG_AGENTS.SALES_AREA_DESC) 
          END
     END AS SALES_AREA_DESC_2

Answer 2

试试这个：

CASE AG_AGENTS.SALES_AREA_DESC
    WHEN 'Dom. - NAT' THEN
    (
        COALESCE(CASE 
                    WHEN PX_PAXWEB.COUNTRY = 'AUT' THEN vw_POSTCODE.POSTCODE
                    WHEN PX_PAXWEB.COUNTRY <> 'AUT' THEN vwPxPaxWeb.SALES_AREA END,
                 AG_AGENTS.SALES_AREA_DESC)
    )
    WHEN 'Int. – Inbound' THEN vwPxPaxweb.SALES_AREA
    ELSE COALESCE(vwPxPaxweb.SALES_AREA,AG_AGENTS.SALES_AREA_DESC)
END AS SALES_AREA_DESC_2

具有多个CASE条件的SQL COALESCE未使用IS NULL返回正确的数据

2 个答案: