Question

我有一个表和一个数组，我想合并它们。

结构（t =目标，s =来源）：

ID          gID
----------- -----------
13          1
14          1
15          1
16          1
17          2
18          2
19          2

当t.ID = s.ID且t.gID = s.gID时，则不会发生任何事情。当s.ID＆lt; 0然后插入。当s.ID不存在时，请删除。

我无法在合并查询中构建它：

merge tableT as t
using @array as s
on (t.ID = s.ID) and (t.gID=s.gID)
when not matched and s.ID < 0 then
insert into
when not matched by source then delete;

当每行的@array中的gID = 1时，查询将删除gID = 2的所有内容。但只有gID = 1才会受到影响。

有人知道如何解决这个问题吗？

Answer 1

您似乎应该将目标限制为与源中具有相同gID的行，如下所示：

with tgt as (
  select *
  from tableT
  where gID in (select gID from @array)
)
merge tgt as t
using @array as s
on (t.ID = s.ID) and (t.gID=s.gID)
when not matched and s.ID < 0 then
insert into
when not matched by source then delete;

Answer 2

when not matched by source then delete;
    ^^^^^^^^^^^^^

如果您只想删除匹配项，请删除not。

合并表与数组

2 个答案: