[英]How can I join two SQL tables, putting a value from the 2nd table into a column in the 1st?
[英]SQL join 2 tables, query 1st with condition from 2nd
我有2张桌子:
停机时间类别: CatID ----- CatName ----- SiteID
停机时间: DtID ----- DtName ----- CatID
如何创建查询,以便可以从停机时间中提取所有记录,其中停机时间类别中的SiteID = x?
我不知道如何用词来表达我的需求,我已经尝试了所有联接,但没有一个能给我我所需要的
任何帮助,将不胜感激,谢谢
编辑:我已经尝试了以下答案的所有变体,但是它们都不起作用...将其中一个复制到SMS并运行它现在第一次可以工作:(我一定在某个地方有错字...愚蠢...感谢您的答复
SELECT D.* FROM
DOWNTIMES D INNER JOIN DOWNTIMECATEGORIES DC ON (D.CATID = DC.CATID)
WHERE DC.SiteID = X
尝试这个:
SELECT T1.CatID
,T1.CatName
,T1.SiteID
FROM Downtimes AS T1
INNER JOIN DowntimesCategories AS T2
ON T1.CatID = T2.CatID
WHERE T2.SiteID = X
尝试以下内部加入:
SELECT *
FROM DOWNTIME_CATEGORIES DC INNER JOIN DOWNTIME D
ON D.CatId = DC.CatID
WHERE DC.SiteID = 'X'
看起来很简单,您需要的是INNER JOIN
SELECT *
FROM Downtime_Categories DC
JOIN Downtimes D
ON DC.CatID = D.CatID
AND DC.SiteID = 'x'
这是我想出的:
Select d.*
From Downtime d
Inner Join DowntimeCategories dc On dc.CategoryId = d.CategoryId
And dc.SiteId = x
你可以试试这个
SELECT D.CatID ,D.CatName ,D.SiteID
FROM Downtimes D INNER JOIN DowntimesCategories DC
ON D.CatID = DC.CatID
WHERE DC.SiteID = put your id here
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