Question

如何使用2个表的选择并集更新获取结果的表：可以说我们有：（使用SQL Server）

 select something
from table1 join
     table2
     on ??? 
where condition1
union 
select something
from table1 join
     table3
     on ???
where condition2

代码

    select it.itemid,it.itemgroupid,it.itemtype, it.itemname
    from item it
    left join part r on r.itemid = it.itemid 
    left join SALES sl on it.itemid=sl.itemid
   where
      it.itemtype =1
      and r.partnumber =10
      and sl.CREATEDDATE between '2010-01-01 00:00:00' and CURRENT_TIMESTAMP

UNION 
     select distinct it.itemid,it.itemgroupid,it.itemtype, it.itemname
     from item it 
     left join salesdetail sa on sa.itemid=it.itemid 
     it.itemtype =1
     where sa.SALESSTATUS =1

` 如何根据上面的Select查询的结果更新table1中的字段？

如果itemid与上面选择的输出相同的ite ID，我现在想将itemTable字段x更新为1

Answer 1

请考虑将带有WHERE的{{1}}子句用于更新。确保使用某些字段的名称进行更新。下面使用CTE作为IN查询值。除了 itemid

以外，所有字段都已在IN中删除。

SELECT

Answer 2

我认为您可以尝试以下链接：

`UPDATE item SET item_id =
select it.itemid
    from item it
    left join part r on r.itemid = it.itemid 
    left join SALES sl on it.itemid=sl.itemid
   where
      it.itemtype =1
      and r.partnumber =10
      and sl.CREATEDDATE between '2010-01-01 00:00:00' and CURRENT_TIMESTAMP

UNION 
     select distinct it.itemid
     from item it 
     left join salesdetail sa on sa.itemid=it.itemid 
     it.itemtype =1
     where sa.SALESSTATUS =1`

如何更新使用联盟的表

2 个答案: