问题描述
我是SQL的新手,无法弄清楚如何更新我的表
(StoreItemStatus),其中包含每个项目的当前状态
store(STORE_KEY,ITEM_KEY,STATUS,...)。
我在表格中获得更新的状态信息(我称之为NewInfo)
有类似的字段。 NewInfo可能包含每个
商店/项目的多个记录,但我将使用最新状态。我不确定如何使用NewInfo的每条记录更新StoreItemStatus
。任何建议都是
非常感谢
谢谢,
Paul
I''m new to SQL and can''t figure out how to update my table
(StoreItemStatus) that contains the current status for items in each
store (STORE_KEY, ITEM_KEY, STATUS,...).
I get updated status info in a table (I''ll call it NewInfo) that
has similar fields. NewInfo may contain multiple records for each
Store/Item, but I will just use the latest status. I''m not sure how
to update StoreItemStatus using each record of NewInfo. Any advice is
greatly appreciated
Thanks,
Paul
推荐答案
大卫,
除非OP确定每个Store / Item组合在NewInfo表中至少有一行
行,否则他最好添加
WHERE EXISTS
(SELECT *
来自NewInfo
WHERE store_key = StoreItemStatus.store_key
AND item_key = StoreItemStatus.item_key)
来自这个查询。
Best,Hugo
-
(删除_NO_和_SPAM_以获取我的电子邮件地址)
Hi David,
Unless the OP is sure that every Store / Item combination has at least one
row in the NewInfo table, he''d better add
WHERE EXISTS
(SELECT *
FROM NewInfo
WHERE store_key = StoreItemStatus.store_key
AND item_key = StoreItemStatus.item_key)
to this query.
Best, Hugo
--
(Remove _NO_ and _SPAM_ to get my e-mail address)
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