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# SQL Statement - comparing 2 results

Posted on 2013-12-09
Medium Priority
357 Views
Table 1                        Table 2

AnimalID, COUNT(AnimalID)      AnimalID, Count(AnimalID)

Cat      1                  Cat      4
Dog      4                  Dog       4
Hippo      5            Snake      3
Cow      1                  Frog      4
Frog      2                  Horse      5
Sheep      1
Pig      3

And I need the resultset to be Table 1 minus Table 2

Cat      -3
Dog      0
Hippo      5
Cow      1
Frog      -2
Snake       -3
Horse      -5
Sheep      -1
Pig      -3

So the first column is an AnimalID, the 2nd is the count of AnimalID.  This information would be the result of Table 1 "SELECT AnimalID, COUNT(AnimalID)FROM Farms WHERE FarmID = 89" and Table 2 "SELECT AnimalID, COUNT(AnimalID)FROM Houses WHERE HouseID = 54"

Any ideas?  I feel like the answer is easy and I should know how to do this but it's not coming to me, help!
0
Question by:ProdigyOne2k
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• 3

LVL 66

Expert Comment

ID: 39707575
Probably a number of ways to pull this off, but the one that immediately comes to mind is...
``````SELECT AnimalID, SUM(the_count) as total
FROM (
SELECT AnimalID, COUNT(AnimalID) as the_count
FROM Table1
GROUP BY AnimalID
UNION ALL
SELECT AnimalID, COUNT(AnimalID) * -1 as the_count
FROM Table2
GROUP BY AnimalID) t
GROUP BY AnimalID
ORDER BY AnimalID
``````
0

LVL 27

Accepted Solution

Chris Luttrell earned 2000 total points
ID: 39707588
Something like this:
``````SELECT  COALESCE(T1.AnimalId,T2.AnimalId) AS AnimalId,
COALESCE(T1.Cnt,0) - COALESCE(T2.Cnt,0) Results
FROM
(SELECT AnimalId, COUNT(AnimalId) Cnt FROM Table1 GROUP BY AnimalId) AS T1
FULL OUTER JOIN
(SELECT AnimalId, COUNT(AnimalId) Cnt FROM Table2 GROUP BY AnimalId) T2
ON T2.AnimalId = T1.AnimalId
``````
0

LVL 66

Expert Comment

ID: 39707672
ProdigyOne2k - Did you try my solution?  Just curious.
0

LVL 66

Expert Comment

ID: 39708479
Actually, the FULL OUTER JOIN looks like the superior solution, as when I ran both and viewed the SET STATISTICS IO ON, the UNION ALL executed in 115ms, and the FULL OUTER JOIN executed in 4ms.

``````SET SHOWPLAN_XML OFF
GO

IF EXISTS (SELECT name FROM sys.tables WHERE name='animals1')
DROP TABLE animals1
GO

IF EXISTS (SELECT name FROM sys.tables WHERE name='animals2')
DROP TABLE animals2
GO

CREATE TABLE animals1 (AnimalID varchar(15))
CREATE TABLE animals2 (AnimalID varchar(15))

INSERT INTO animals1 (AnimalID)
VALUES
('Cat'),
('Dog'), ('Dog'), ('Dog'), ('Dog'),
('Hippo'), ('Hippo'), ('Hippo'), ('Hippo'), ('Hippo'),
('Cow'),
('Frog'), ('Frog')

INSERT INTO animals2 (AnimalID)
VALUES
('Cat'), ('Cat'), ('Cat'), ('Cat'),
('Dog'), ('Dog'), ('Dog'), ('Dog'),
('Snake'), ('Snake'), ('Snake'),
('Frog'), ('Frog'), ('Frog'), ('Frog'),
('Horse'), ('Horse'), ('Horse'), ('Horse'), ('Horse'),
('Sheep'),
('Pig'), ('Pig'), ('Pig')

SET STATISTICS TIME ON

SELECT 'UNION'
SELECT AnimalID, SUM(the_count) as total
FROM (
SELECT AnimalID, COUNT(AnimalID) as the_count
FROM animals1
GROUP BY AnimalID
UNION ALL
SELECT AnimalID, COUNT(AnimalID) * -1 as the_count
FROM animals2
GROUP BY AnimalID) t
GROUP BY AnimalID

SELECT 'FULL OUTER JOIN'
SELECT  COALESCE(T1.AnimalId,T2.AnimalId) AS AnimalId,
COALESCE(T1.Cnt,0) - COALESCE(T2.Cnt,0) Results
FROM
(SELECT AnimalId, COUNT(AnimalId) Cnt FROM animals1 GROUP BY AnimalId) AS T1
FULL OUTER JOIN
(SELECT AnimalId, COUNT(AnimalId) Cnt FROM animals2 GROUP BY AnimalId) T2
ON T2.AnimalId = T1.AnimalId
GO
``````
0

Author Comment

ID: 39710403
Hey Jimhorn,,
I did not yet but i will check out your last post and let you know how it goes
Thanks!
0

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