SQL Percentages

Hi,
I have the table with data as follows:

LocationID    GroupID
10                       20
10                       20
10                       20
10                       10
10                       60
10                       20
11                       20

I would like to return the locationIDs, etc, where the number of a spcific GroupID,for example 20,  for that location is 80% or more of the total for that location.
Any help would be appreciated
Thanks
Morpheus7Asked:
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Harish VargheseProject LeaderCommented:
Create Table #test (LocationId int, GroupId int)
Insert into #test values 
(10, 20),
(10, 20),
(10, 20),
(10, 10),
(10, 60),
(10, 20),
(11, 20)

Select A.* from #test A, 
	(Select LocationId, SUM(GroupId) GroupSum
	From #test Group by LocationId) B
Where A.LocationId = B.LocationId
And A.GroupId >= B.GroupSum * 0.8

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Scott PletcherSenior DBACommented:
IF OBJECT_ID('tempdb.dbo.#GroupCounts') IS NOT NULL
    DROP TABLE #GroupCounts

SELECT
    LocationId, GroupId, COUNT(*) AS GroupCount
INTO #GroupCounts
FROM #test
GROUP BY
    LocationId, GroupId WITH ROLLUP

SELECT gc.LocationId, gc.GroupId, gc.GroupCount
FROM #GroupCounts gc
WHERE
    gc.GroupId IS NOT NULL AND
    gc.GroupCount >= (SELECT gc2.GroupCount FROM #GroupCounts gc2 WHERE gc2.GroupId IS NULL AND gc2.LocationId = gc.LocationId) * 0.8
0
John_VidmarCommented:
SELECT	LocationId
FROM	mytable
GROUP
BY	LocationId
HAVING	( SUM(CASE WHEN GroupId = 20 THEN 1.0 END) / COUNT(*) ) >= 0.8

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0

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kjuliusCommented:
SELECT t1.LocationId, t1.GroupId, LocationGroupIdRcds, LocationIdRcds, CAST(LocationGroupIdRcds * 100 / LocationIdRcds AS DEC(5,2)) AS Pct
FROM (
		SELECT LocationId, GroupId, COUNT(*) AS LocationGroupIdRcds
		FROM #test
		GROUP BY LocationId, GroupId) t1
INNER JOIN (
		SELECT LocationId, COUNT(*) AS LocationIdRcds
		FROM #test
		GROUP BY LocationId) t2
			ON t2.LocationId = t1.LocationId
WHERE CAST(LocationGroupIdRcds * 100 / LocationIdRcds AS DEC(5,2)) >= 80

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0
kjuliusCommented:
or the same using windowing:

SELECT *, CAST(LocationGroupIdRcds * 100 / LocationIdRcds AS DEC(5,2)) AS Pct
FROM ( 
	SELECT LocationId, GroupId, COUNT(*) OVER(PARTITION BY LocationId, GroupId) AS LocationGroupIdRcds, COUNT(*) OVER(PARTITION BY LocationId) AS LocationIdRcds
	FROM #Test) t1
WHERE CAST(LocationGroupIdRcds * 100 / LocationIdRcds AS DEC(5,2)) >= 80

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0
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Microsoft SQL Server

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