Question

SQL find customers who ordered something more than once

Asked by: spudsoftware

How can I query my SQL database and find all the duplicate orders where a customer ordered something more than once?

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Asked On
2009-02-27 at 07:48:44ID24184070
Tags

sql

Topics

UseNet (NNTP)

,

MS SQL Server

Participating Experts
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500
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Answers

 

by: chapmandewPosted on 2009-02-27 at 07:53:27ID: 23756685

example

select customerid, productid, count(*)
from orders
group by customerid, productid
having count(*) > 1

 

by: BrandonGalderisiPosted on 2009-02-27 at 07:55:03ID: 23756697

I don't know you table names, or column names, but this is the structure of the query given a customer and customer order table, linked by customerid.

Select customer.customerid, customer.customername, customerorder.ordered_item_number, count(*) as NumberOfTimesOrdered
from customer
  join customerorder
    on customer.customerid = customerorder.customerid
group by customer.customerid, customer.customername, customerorder.ordered_item_number
having count(*)>1

                                              
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by: aaronakinPosted on 2009-02-27 at 07:55:21ID: 23756702

Depends on what kind of table structure you have really, but let's say you have 3 tables (Customers, Products, Orders).

SELECT c.CustomerID, p.ProductID, COUNT(*)
  FROM Customers c
    INNER JOIN Orders o ON c.CustomerID = o.CustomerID.
    INNER JOIN Products p ON o.OrderID = p.OrderID
  GROUP BY c.CustomerID, p.ProductID
  HAVING COUNT(*) > 1

 

by: aaronakinPosted on 2009-02-27 at 07:56:11ID: 23756714

My bad...man you have to be quick.  Sorry about the dup post guys.

 

by: spudsoftwarePosted on 2009-02-27 at 08:47:41ID: 23757306

Thanks your solutions helped.
How do I put today's date in a CompleteDatefield for the oldest of the orders displayed per customer?

 

by: aaronakinPosted on 2009-02-27 at 08:50:37ID: 23757336

Is this what you mean?

SELECT c.CustomerID, p.ProductID, COUNT(*), GETDATE() AS CompleteDate
  FROM Customers c
    INNER JOIN Orders o ON c.CustomerID = o.CustomerID.
    INNER JOIN Products p ON o.OrderID = p.OrderID
  GROUP BY c.CustomerID, p.ProductID
  HAVING COUNT(*) > 1

or is this what you mean?

SELECT c.CustomerID, p.ProductID, COUNT(*), MAX(o.CompleteDate) AS CompleteDate
  FROM Customers c
    INNER JOIN Orders o ON c.CustomerID = o.CustomerID.
    INNER JOIN Products p ON o.OrderID = p.OrderID
  GROUP BY c.CustomerID, p.ProductID
  HAVING COUNT(*) > 1

 

by: spudsoftwarePosted on 2009-02-27 at 09:33:41ID: 23757767

Close.
But sometimes I am getting records that have "orders" (ProcedureID) that have only been ordered once, which is incorrect.  Then I want to update RCCompleteDate to Today's date when ProcedureDate is the oldest date.  This is what I have so far.

SELECT PatientHistory.PatientID, PatientHistory.ProcedureID, PatientHistory.ProcedureDate, PatientHistory.RCCompleteDate
FROM (PatientHistory LEFT JOIN Procedures ON PatientHistory.ProcedureID=Procedures.ID) INNER JOIN Patients ON PatientHistory.PatientID=Patients.ID
WHERE (((PatientHistory.PatientID) In (SELECT [PatientID] FROM [PatientHistory] As Tmp GROUP BY [PatientID],ProcedureID HAVING Count(*)>1 )))
ORDER BY PatientHistory.PatientID;

 

by: aaronakinPosted on 2009-02-27 at 10:26:18ID: 23758406

To solve the first problem of returning single orders, you need to change the IN statement of the WHERE clause to an EXISTS statement.

As for updating the date field, I'm not really sure what you're asking.  Can you provide an example of what you want the final output to look like?

SELECT PatientHistory.PatientID
     , PatientHistory.ProcedureID
     , PatientHistory.ProcedureDate
     , PatientHistory.RCCompleteDate
  FROM PatientHistory
    LEFT OUTER JOIN Procedures ON PatientHistory.ProcedureID = Procedures.ID
    INNER JOIN Patients ON PatientHistory.PatientID = Patients.ID
  WHERE EXISTS
         (
         SELECT [PatientID], ProcedureID
           FROM [PatientHistory] TMP
           WHERE TMP.PatientID = PatientHistory.PatientID
             AND TMP.ProcedureID = PatientHistory.ProcedureID
           GROUP BY [PatientID], ProcedureID
           HAVING COUNT(*) > 1
         )
  ORDER BY PatientHistory.PatientID

                                              
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by: spudsoftwarePosted on 2009-02-27 at 10:48:15ID: 23758617

Yes.

PatientID            ProcedureID              ProcedureDate      RCCompleteDate
11                       40                              3-14-2005
11                       40                             10-3-2008


The update query should change RCCompleteDate for the oldest ProcedureDate, so it should look like

PatientID            ProcedureID              ProcedureDate      RCCompleteDate
11                       40                              3-14-2005             10-3-2008
11                       40                             10-3-2008

The most recent ProcedureDate will be the only one with a blank RCCompleteDate.
Thanks for your help.

20120131-EE-VQP-002

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