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Need Counts

I have two columns in a sql server table

LanID,   SerialNumber
100        101
101        101
102        987
103        622
104        733
104        733
105        626
106        626
107        626

Each LanID should have a unique serial number.   I need a list of SerialNumbers that has more than one LanID

Please I need a TSQL that gives me the SerialNumbers that have more than one LanID and a count of them
0
Charles Baldo
Asked:
Charles Baldo
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1 Solution
 
PortletPaulCommented:
SELECT
      *
FROM (
      SELECT
            LanID
          , SerialNumber
          , COUNT(*) OVER (PARTITION BY LanID ORDER BY SerialNumber) LanID_count
          , COUNT(*) OVER (PARTITION BY SerialNumber ORDER BY LanID) SerialNumber_count
    FROM your-table-here
    ) d
WHERE LanID_count > 1
      OR SerialNumber_count > 1

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{+edits} sorry please ensure you refresh
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PortletPaulCommented:
goodness, what was I thinking. started with row_number() in mind, then halfway swapped to count() and butchered it. This is better:
SELECT
      *
FROM (
      SELECT
            LanID
          , SerialNumber
          , COUNT(*) OVER (PARTITION BY LanID) LanID_count
          , COUNT(*) OVER (PARTITION BY SerialNumber) SerialNumber_count
      FROM table1
    ) d
WHERE LanID_count > 1
      OR SerialNumber_count > 1
ORDER BY LanID

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result looks like this:
| LanID | SerialNumber | LanID_count | SerialNumber_count |
|-------|--------------|-------------|--------------------|
|   100 |          101 |           1 |                  2 |
|   101 |          101 |           1 |                  2 |
|   104 |          733 |           2 |                  2 |
|   104 |          733 |           2 |                  2 |
|   105 |          626 |           1 |                  3 |
|   106 |          626 |           1 |                  3 |
|   107 |          626 |           1 |                  3 |

CREATE TABLE Table1
    ([LanID] int, [SerialNumber] int)
;
    
INSERT INTO Table1
    ([LanID], [SerialNumber])
VALUES
    (100, 101),
    (101, 101),
    (102, 987),
    (103, 622),
    (104, 733),
    (104, 733),
    (105, 626),
    (106, 626),
    (107, 626)
;

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Pawan KumarDatabase ExpertCommented:
Try.. Also note that Order by is not required in case of COUNT(*) OVER (PARTITION BY Col.)

--

CREATE TABLE Table1
    ([LanID] int, [SerialNumber] int)
GO
    
INSERT INTO Table1
    ([LanID], [SerialNumber])
VALUES
    (100, 101),
    (101, 101),
    (102, 987),
    (103, 622),
    (104, 733),
    (104, 733),
    (105, 626),
    (106, 626),
    (107, 626)
GO

--

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Query
----

--


SELECT * FROM 
(
	SELECT * , COUNT(*) OVER (PARTITION BY [SerialNumber]) Cnt
	FROM Table1 
)k
WHERE Cnt > 1

--

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O/p
-------------
LanID      SerialNumber      Cnt
100                      101                       2
101                      101                       2
105                      626                       3
106                      626                       3
107                      626                       3
104                      733                       2
104                      733                       2

Do you want Lan Ids information also along with the above info?
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Charles BaldoSoftware DeveloperAuthor Commented:
Thank You
0
 
PortletPaulCommented:
This is better:
and I corrected myself with the second comment, you will notice there is no order by in that

30 minutes later someone else points out the error I already admitted to, and corrected?

curious that such unfriendly behaviour should be rewarded
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Pawan KumarDatabase ExpertCommented:
Ohhh my bad !!, Didn't checked your second solution. Reopening the question and yes points should be awarded to you only.
@Author - Pls award to points to Paul. I didn't his second solution. :)
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Scott PletcherSenior DBACommented:
Wow, any Windowing function is overkill for this.  A standard GROUP BY and HAVING can handle this:

SELECT SerialNumber, COUNT(*) AS Total_Uses, MIN(LanID) AS LanID_Min, MAX(LanID) AS LanID_Max
FROM table_name
GROUP BY SerialNumber
HAVING COUNT(*) > 1

If there's more than two for a given serial number, and you need to lookup them all up, an outer query to handle that could easily be added as well, sample code below.  This does add some overhead, but probably not as much as another full scan for the Windowing(s), especially if the table is properly indexed.

SELECT t.*
FROM (
    SELECT SerialNumber, COUNT(*) AS Total_Uses, MIN(LanID) AS LanID_Min, MAX(LanID) AS LanID_Max
    FROM table1
    GROUP BY SerialNumber
    HAVING COUNT(*) > 1
) AS dups
INNER JOIN Table1 t ON t.SerialNumber = dups.SerialNumber AND t.LanID BETWEEN dups.LanID_Min AND dups.LanID_Max
ORDER BY t.SerialNumber, t.LanID
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Charles BaldoSoftware DeveloperAuthor Commented:
My apologies, was moving fast needed solution

The solution worked, was not my intention to misappropriate points.

Hope all is correct
Thank you to all who helped.
0

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