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Query help needed

Posted on 2014-02-01
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Last Modified: 2014-02-01
I need help with the logic of this query.

I have two tables - customers and orders.

Customers
--------------------------------------
custid    name
1            Joe
2            Sam
3            Rick

Orders
-------------------------------------
orderid  custid  orderdate           status
1               1        01/01/2006       posted
2               1        10/10/2013       posted
3               1        01/14/2014       in process
4               2        02/02/2008       posted

I need the query to select all customers where the orderdate =>01/01/2012 AND the status is posted.

The criteria for the expected customer results is based on the values in orders. Currently the results I am getting include duplication of customers where there are more than one order that meets the criteria.

Example:
SELECT * from Customers
INNER JOIN    -- have tried other joins also
custid on customer.custid = orders.custid
WHERE
status = 'posted' and orderdate >= 01/01/2012

This results in two duplicate records in the results for custid 1

How do I need to properly construct the query to get the desired results?
0
Comment
Question by:ckelsoe
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9 Comments
 
LVL 61

Expert Comment

by:mbizup
ID: 39826643
What database platform are you using?

Access?  SQL Server?  ...?  (this makes a difference)

Try delimiting your dates:


status = 'posted' and orderdate >= #01/01/2012#       (MS Access)

status = 'posted' and orderdate >= '01/01/2012'       (SQL Server and others)


(Without the delimiters, 01/01/2012 is 1 divided by 1 divided by 2012)
0
 
LVL 45

Accepted Solution

by:
Kent Olsen earned 500 total points
ID: 39826659
Hi ckelsoe,

Probably the easiest to select the most recent when there are duplicates.

SELECT * 
FROM customers c
INNER JOIN order o
  ON c.customer_id = o.customer_id
WHERE order_date >= '01/'1/2-13'
  AND order_status = 'posted'
  AND order_id = (select max(order_id) from order o1 where o1.customer_id = o.customer_id and o1.order_status = 'posted')

Open in new window



That should work fine in SQL Server.


Good Luck,
Kent
0
 

Author Closing Comment

by:ckelsoe
ID: 39826701
Thanks - I think that should work perfectly for what I need.
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Author Comment

by:ckelsoe
ID: 39827107
Ok I now have this issue. The MAX(OrderID) does not work as there is a case where the highest order id does not have the date within the scope. An earlier orderid does have a date within scope. The code as written above drops that customer when it should be included in the results. I tried changing it to max(order_date) but that returns no results at all. Ideas?
0
 

Author Comment

by:ckelsoe
ID: 39827123
So this works:
SELECT
	MAX (PostedDate)
FROM
	ERCHistory
WHERE
	customerid = 394
AND ERCStatus = 'posted'

Open in new window


But this does not:
SELECT
	c.CustomerID,
	c.Business,
	c.BusName,
	c.NameLast,
	c.NameFirst,
	c.Address1,
	c.City,
	c.State,
	c.Zip,
	c.Phone,
	c.BusPhone,
	c.Cell,
	c.Email,
	c.Pager,
	c.ResaleNumber,
	c.TaxExemptParts,
	c.TaxExemptLabor,
	c.[TimeStamp]
FROM
	dbo.Customer c
INNER JOIN dbo.ERCHistory o ON c.CustomerID = o.CustomerID
WHERE
	o.ERCStatus = 'Posted'
AND o.PostedDate >= '01/01/2006'
AND o.ERCID = (
	SELECT
		MAX (PostedDate)
	FROM
		ERCHistory o1
	WHERE
		o1.CustomerID = o.CustomerID
	AND o1.ERCStatus = 'posted'
)
ORDER BY c.CustomerID ASC

Open in new window


The initial code at MAX (ERCID) which did work.

Here is the data that is causing the issue:
ERCID      CustomerID      ERCStatus      PostedDate
913              394      Posted      2004-09-15-00:00:00.000
1064      394      Posted      2005-03-09-00:00:00.000
1103      394      Posted      2005-04-26-00:00:00.000
1281      394      Posted      2006-01-10-00:00:00.000
1282      394      Posted      2005-12-30-00:00:00.000
0
 
LVL 45

Expert Comment

by:Kent Olsen
ID: 39827162
No problem.  With just need to include the data check in the inner filter.  I had assumed that the dates would increment as the ID value did...

SELECT *
FROM customers c
INNER JOIN order o
  ON c.customer_id = o.customer_id
WHERE order_date >= '01/01/2013'
  AND order_status = 'posted'
  AND order_id = (select max(order_id) from order o1 where o1.customer_id = o.customer_id and o1.order_status = 'posted' and order_date >= '01/01/2013')
                                           

Try that one.  :)
0
 

Author Comment

by:ckelsoe
ID: 39827170
Ok It is still not picking up the cases where the highest ercid does not have the latest posteddate. Here is the modified code looks like this:
SELECT
	c.CustomerID,
	c.Business,
	c.BusName,
	c.NameLast,
	c.NameFirst,
	c.Address1,
	c.City,
	c.State,
	c.Zip,
	c.Phone,
	c.BusPhone,
	c.Cell,
	c.Email,
	c.Pager,
	c.ResaleNumber,
	c.TaxExemptParts,
	c.TaxExemptLabor,
	c.[TimeStamp]
FROM
	dbo.Customer c
INNER JOIN dbo.ERCHistory o ON c.CustomerID = o.CustomerID
WHERE
	o.ERCStatus = 'Posted'
AND o.PostedDate >= '01/01/2006'
AND o.ERCID = (
	SELECT
		MAX (ERCID)
	FROM
		ERCHistory o1
	WHERE
		o1.CustomerID = o.CustomerID
	AND o1.ERCStatus = 'posted'
  AND o.PostedDate >= '01/01/2006'
)
ORDER BY c.CustomerID ASC

Open in new window

0
 
LVL 45

Expert Comment

by:Kent Olsen
ID: 39827184
Line 34.

It should read,

  AND o1.PostedDate >= '01/01/2006'
0
 

Author Comment

by:ckelsoe
ID: 39827212
Missed that - THANK YOU!!!!
0

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