我一直在努力研究如何在一天左右的时间内完成特定查询,并且已经达到了我需要一些外界帮助的程度。因此我的问题。
鉴于以下数据;
DECLARE @Data AS TABLE
(
OrgId INT,
ThingId INT
)
DECLARE @ReplacementData AS TABLE
(
OldThingId INT,
NewThingId INT
)
INSERT INTO @Data (OrgId, ThingId)
VALUES (1, 2), (1, 3), (1, 4),
(2, 1), (2, 4),
(3, 3), (3, 4)
INSERT INTO @ReplacementData (OldThingId, NewThingId)
VALUES (3, 4), (2, 5)
我想找到任何有"事情的组织"已被替换为@ReplacementData
表变量中的表示。我想要看到组织ID,它们已被替换的东西以及应该替换它的东西的id。例如,鉴于上述数据,我应该看到;
Org id, Thing Id, Replacement Thing Id org doesn't have but should have
1, 2, 5 -- As Org 1 has 2, but not 5
我试图让这项工作有很多尝试,而我似乎无法理解如何解决这个问题。以下是我的几次尝试,但我认为我离开了;
-- Attempt using correlated subqueries and EXISTS clauses
-- Show all orgs that have the old thing, but not the new thing
-- Ideally, limit results to OrgId, OldThingId and the NewThingId that they should now have too
SELECT *
FROM @Data d
WHERE EXISTS (SELECT *
FROM @Data oldstuff
WHERE oldstuff.OrgId = d.OrgId
AND oldstuff.ThingId IN
(SELECT OldThingID
FROM @ReplacementData))
AND NOT EXISTS (SELECT *
FROM @Data oldstuff
WHERE oldstuff.OrgId = d.OrgId
AND oldstuff.ThingId IN
(SELECT NewThingID
FROM @ReplacementData))
-- Attempt at using a JOIN to only include those old things that the org has (via the where clause)
-- Also try exists to show missing new things.
SELECT *
FROM @Data d
LEFT JOIN @ReplacementData rd ON rd.OldThingId = d.ThingId
WHERE NOT EXISTS (
SELECT *
FROM @Data dta
INNER JOIN @ReplacementData rep ON rep.NewThingId = dta.ThingId
WHERE dta.OrgId = d.OrgId
)
AND rd.OldThingId IS NOT NULL
非常感谢任何帮助。我可能会完全错误,所以如果有更好的方法来解决这类问题,请告诉我。
答案 0 :(得分:2)
试试看,告诉我。
DECLARE @Data AS TABLE
(
OrgId INT,
ThingId INT
)
DECLARE @ReplacementData AS TABLE
(
OldThingId INT,
NewThingId INT
)
INSERT INTO @Data (OrgId, ThingId)
VALUES (1, 2), (1, 3), (1, 4),
(2, 1), (2, 4),
(3, 3), (3, 4)
INSERT INTO @ReplacementData (OldThingId, NewThingId)
VALUES (3, 4), (2, 5)
SELECT D.OrgId, RD.*
FROM @Data D
JOIN @ReplacementData RD
ON D.ThingId=RD.OldThingId
LEFT OUTER JOIN @Data EXCLUDE
ON D.OrgId = EXCLUDE.OrgId
AND RD.NewThingId = EXCLUDE.ThingId
WHERE EXCLUDE.OrgId IS NULL