Solved

SQL Query Problem

Posted on 2007-03-30
4
235 Views
Last Modified: 2010-06-21
Hi there,

I am trying to retrieve the last 100 distinct job positions that have attended an event. Right now the query returns the last 100 job positions but they are not distinct, because I have an order by event start date in my query clause. Is there anyway else I can retrieve this information.
I've posted the query below. I've tried a group by and that didn't work either because of the event start date.

Query:
SELECT DISTINCT TOP 100      WebUser.Wuser_Position, Event.Evnt_Start_Date
FROM                     Event INNER JOIN
                  Invoice ON Event.Evnt_ID = Invoice.Evnt_ID INNER JOIN
                  InvoiceItems ON Invoice.Inv_ID = InvoiceItems.Inv_ID INNER JOIN
                  WebUser ON InvoiceItems.Wuser_ID = WebUser.Wuser_ID
WHERE                  (WebUser.Wuser_Position IS NOT NULL) AND (WebUser.Wuser_Enabled = 1) AND
                  (NOT (UPPER(WebUser.Wuser_First_Name) LIKE '%TEST%')) AND
                  (NOT (UPPER(WebUser.Wuser_Last_Name) LIKE '%TEST%'))                  
ORDER BY             Event.Evnt_Start_Date DESC
0
Comment
Question by:quanmac
  • 2
4 Comments
 
LVL 50

Accepted Solution

by:
Lowfatspread earned 500 total points
ID: 18824480
you do want group by
you don't want distinct
you need to select max dates...
and for performance avoid using NOT...

SELECT  TOP 100      WebUser.Wuser_Position,max(Event.Evnt_Start_Date) as start_date
FROM                     Event
 INNER JOIN           Invoice
ON Event.Evnt_ID = Invoice.Evnt_ID
 INNER JOIN           InvoiceItems
ON Invoice.Inv_ID = InvoiceItems.Inv_ID
 INNER JOIN       (select *
                                     ,case when UPPER(Wuser_first_name) like '%TEST%' then 1 else 0 end as FN
         ,case when UPPER(Wuser_last_name) like '%TEST%' then 1 else 0 end as LN
                              from   WebUser
                             where Wuser_Position IS NOT NULL
                                 AND Wuser_Enabled = 1

 ON InvoiceItems.Wuser_ID = WebUser.Wuser_ID
WHERE     FN = 0 and LN=0
group by webuser.wuser_position        
ORDER BY   Event.Evnt_Start_Date DESC
 
0
 
LVL 23

Expert Comment

by:Christopher Kile
ID: 18824534
Is this SQL Server?

Don't use a single query.  Use a stored procedure.

CREATE PROCEDURE get100Positions
AS
CREATE TABLE #tempPos (
position <whatever type Wuser_position is> NOT NULL PRIMARY KEY
)

DECLARE p1 READ-ONLY CURSOR FOR
SELECT
WebUser.Wuser_Position, Event.Evnt_Start_Date
FROM                    
Event
INNER JOIN
Invoice
ON
Event.Evnt_ID = Invoice.Evnt_ID
INNER JOIN
InvoiceItems ON Invoice.Inv_ID = InvoiceItems.Inv_ID
INNER JOIN
WebUser
ON InvoiceItems.Wuser_ID = WebUser.Wuser_ID
WHERE                  
(
WebUser.Wuser_Position IS NOT NULL
)
AND
(
WebUser.Wuser_Enabled = 1
)
AND
(
NOT
(
UPPER(WebUser.Wuser_First_Name) LIKE '%TEST%'
)
)
AND
(
NOT
(
UPPER(WebUser.Wuser_Last_Name) LIKE '%TEST%'
)
)                  
ORDER BY            
Event.Evnt_Start_Date DESC

OPEN p1

DECLARE @position <type of Wuser_Position>
DECLARE @startDate DATETIME

FETCH NEXT FROM p1 INTO @postion, @startDate
WHILE @@FETCH_STATUS = 0 AND (SELECT COUNT COUNT(*) FROM #tempPOS) < 100)
BEGIN
    IF (SELECT COUNT(*) FROM #tempPOS WHERE position = @position) = 0
    BEGIN
        INSERT INTO #tempPos (position) VALUES (@position)
    END
END

CLOSE p1
DEALLOCATE p1

RETURN
GO
0
 
LVL 23

Expert Comment

by:Christopher Kile
ID: 18824541
Whoops!

Add before RETURN:

SELECT * FROM #tempPos
0
 
LVL 3

Author Comment

by:quanmac
ID: 18824552
Thanks Lowfatspread, it worked like a charm
0

Featured Post

NEW Veeam Agent for Microsoft Windows

Backup and recover physical and cloud-based servers and workstations, as well as endpoint devices that belong to remote users. Avoid downtime and data loss quickly and easily for Windows-based physical or public cloud-based workloads!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Ever wondered why sometimes your SQL Server is slow or unresponsive with connections spiking up but by the time you go in, all is well? The following article will show you how to install and configure a SQL job that will send you email alerts includ…
When it comes to protecting Oracle Database servers and systems, there are a ton of myths out there. Here are the most common.
Via a live example, show how to setup several different housekeeping processes for a SQL Server.
Viewers will learn how to use the SELECT statement in SQL and will be exposed to the many uses the SELECT statement has.

685 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question