Question

我需要更新超过1000条记录。这些值在另一个表中。

我尝试了这个查询：

Update tblEnrollment
SET TrOOPCurrentYrBalanceAmt = tr.TrOOPCurrentYrBalanceAmt
from tblTrOOPbalance tr
join tblMember mem on tr.MedicareNumber = mem.MANumber
join tblEnrollment enr on mem.MemberID = enr.MemberID
where enr.EnrollmentID IN ('16823', '16828')

但是我收到了错误：

Msg 512，Level 16，State 1，Procedure tblEnrollment_UpdateTrigger，Line 9
子查询返回的值超过1 当子查询遵循=，！=，＆lt;，＆lt; =，＆gt;，＆gt; =或子查询用作表达式时，不允许这样做。

我想我无法使用查询更新超过1个。如何更新多条记录？

谢谢，

因为表tblenrollment有一个阻止更新多个记录的触发器，所以我必须使用LOOP逐个更新记录。谁能帮忙怎么写LOOP查询呢？

Answer 1

对于cource，你可以更新多个记录！
您的过程tblEnrollment_UpdateTrigger中似乎有其他代码，并且子查询存在问题。请检查您是否有类似情况，其中sabquery将返回超过1条记录：

where column = (select column2 from table)
update tab set column = (select column2 from table)
select @variable = (select column2 from table)

关于UPDATE声明，我认为最好使用类似的东西：

update enr
set    enr.TrOOPCurrentYrBalanceAmt = tr.TrOOPCurrentYrBalanceAmt
from   tblEnrollment enr
join   tblMember mem on enr.MemberID = mem.MemberID
join   tblTrOOPbalance tr on mem.MANumber = tr.MedicareNumber 
where  enr.EnrollmentID in ('16823','16828')

Answer 2

我相信这update更好。 tblEnrollment是否有主键或唯一列？

update tblEnrollment
set TrOOPCurrentYrBalanceAmt = (
    select tr.TrOOPCurrentYrBalanceAmt
    from tblTrOOPbalance tr
    where tr.MemberID = tblEnrollment.MemberID
)
where EnrollmentID in ('16823', '16828')

这是一个可能对一次性修复有用的黑客攻击：

declare @done bit = 0;
while @done = 0 begin

update top(1) tblEnrollment
set TrOOPCurrentYrBalanceAmt = (
    select tr.TrOOPCurrentYrBalanceAmt
    from tblTrOOPbalance tr
    where tr.MemberID = tblEnrollment.MemberID
)
where EnrollmentID in ('16823', '16828')
    and coalesce(TrOOPCurrentYrBalanceAmt, -999999) <>
        coalesce((
            select tr.TrOOPCurrentYrBalanceAmt
            from tblTrOOPbalance tr
            where tr.MemberID = tblEnrollment.MemberID
        ), -999999);

set @done = case when @@rowcount = 0 then 1 else 0 end
end

您可以使用以下方法进行检查和调试：

select
    TrOOPCurrentYrBalanceAmt as TrOOPCurrentYrBalanceAmt1,
    (
        select tr.TrOOPCurrentYrBalanceAmt
        from tblTrOOPbalance tr
        where tr.MemberID = tblEnrollment.MemberID
    ) as TrOOPCurrentYrBalanceAmt2
from tblEnrollment
where EnrollmentID in ('16823', '16828')
    and coalesce(TrOOPCurrentYrBalanceAmt, -999999) <>
        coalesce((
            select tr.TrOOPCurrentYrBalanceAmt
            from tblTrOOPbalance tr
            where tr.MemberID = tblEnrollment.MemberID
        ), -999999);

如何通过LOOP更新SQL Server中的1000多条记录？

2 个答案: