Select Statement Help

May 29, 2007

Hi,

I am trying to select only the most recent record added to a table per user.  Say the table has a userid, date, and a color and may look like this:

2 5/06/07 red

8 5/3/07 grey

2 5/13/07 green

4 4/30/07 orange

8 4/26/07 yellow

And I want, in any order:

2 5/13/07 green

8 5/3/07 grey

4 4/30/07 orange

 

Thanks for any help.

Greg

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Sep 3, 2007

Hello... im having a problem with my query optimization....

I have a query that looks like this:


SELECT * FROM table1
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Aug 29, 2006

I am currently having this problem with gridview and detailview. When I drag either onto the page and set my select statement to pick from one table and then update that data through the gridview (lets say), the update works perfectly.  My problem is that the table I am pulling data from is mainly foreign keys.  So in order to hide the number values of the foreign keys, I select the string value columns from the tables that contain the primary keys.  I then use INNER JOIN in my SELECT so that I only get the data that pertains to the user I am looking to list and edit.  I run the "test query" and everything I need shows up as I want it.  I then go back to the gridview and change the fields which are foreign keys to templates.  When I edit the templates I bind the field that contains the string value of the given foreign key to the template.  This works great, because now the user will see string representation instead of the ID numbers that coinside with the string value.  So I run my webpage and everything show up as I want it to, all the data is correct and I get no errors.  I then click edit (as I have checked the "enable editing" box) and the gridview changes to edit mode.  I make my changes and then select "update."  When the page refreshes, and the gridview returns, the data is not updated and the original data is shown. I am sorry for so much typing, but I want to be as clear as possible with what I am doing.  The only thing I can see being the issue is that when I setup my SELECT and FROM to contain fields from multiple tables, the UPDATE then does not work.  When I remove all of my JOIN's and go back to foreign keys and one table the update works again.  Below is what I have for my SQL statements:------------------------------------------------------------------------------------------------------------------------------------- SELECT:SELECT People.FirstName, People.LastName, People.FullName, People.PropertyID, People.InviteTypeID, People.RSVP, People.Wheelchair, Property.[House/Day Hab], InviteType.InviteTypeName FROM (InviteType INNER JOIN (Property INNER JOIN People ON Property.PropertyID = People.PropertyID) ON InviteType.InviteTypeID = People.InviteTypeID) WHERE (People.PersonID = ?)UPDATE:UPDATE [People] SET [FirstName] = ?, [LastName] = ?, [FullName] = ?, [PropertyID] = ?, [InviteTypeID] = ?, [RSVP] = ?, [Wheelchair] = ? WHERE [PersonID] = ? ---------------------------------------------------------------------------------------------------------------------------------------The only fields I want to update are in [People].  My WHERE is based on a control that I use to select a person from a drop down list.  If I run the test query for the update while setting up my data source the query will update the record in the database.  It is when I try to make the update from the gridview that the data is not changed.  If anything is not clear please let me know and I will clarify as much as I can.  This is my first project using ASP and working with databases so I am completely learning as I go.  I took some database courses in college but I have never interacted with them with a web based front end.  Any help will be greatly appreciated.Thank you in advance for any time, help, and/or advice you can give.Brian 

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Oct 29, 2007

Hi guys,
I have the query below (running okay):



Code Block
SELECT DISTINCT Field01 AS 'Field01', Field02 AS 'Field02'
FROM myTables
WHERE Conditions are true
ORDER BY Field01

The results are just as I need:


Field01 Field02

------------- ----------------------

192473 8461760

192474 22810



Because other reasons. I need to modify that query to:



Code Block
SELECT DISTINCT Field01 AS 'Field01', Field02 AS 'Field02'
INTO AuxiliaryTable
FROM myTables
WHERE Conditions are true
ORDER BY Field01
SELECT DISTINCT [Field02] FROM AuxTable
The the results are:

Field02

----------------------

22810
8461760

And what I need is (without showing any other field):

Field02

----------------------

8461760
22810


Is there any good suggestion?
Thanks in advance for any help,
Aldo.

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Hello friends,
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SELECT E.EmployeeID,
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WHEN 1 THEN
select * from Tbl1
WHEN 2 THEN
select * from Tbl2
WHEN 3 THEN
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END
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can any one help me in this?
please give me a sample query.

Thanks and Regards,
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INSERT INTO EMImportListing ("
sql += " CustId,Title,Description,JobCity,JobState,JobPostalCode,JobCountry,URL,Requirements, "
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Hi,

I am a newbie to this site and hope someone can help....

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if(TL_flag= '1', "yes") as [Trial Leave]

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Hi All,

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BEGIN
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...i also looked through some Case...When statements am just not sure how to put in the condition

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Hi there,
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Hi,
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Hi.
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Dec 28, 2007

hello
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pf.FundId,
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f.FundName,
CASE
WHEN
pf.PlanFundDisplayName IS NULL
THEN
f.ShortName
ELSE pf.PlanFundDisplayName
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p.OneYear,
p.ThreeYear,
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p.TenYear,
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f.ExpenseRatio,
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f.AssetAllocationEquityPercent EquityAllocPct,
f.AssetAllocationConvertiblesPercent ConvertAllocPct,
f.AssetAllocationFixedIncomePercent FixedIncAllocPct,
f.AssetAllocationOtherPercent OtherAlloc,
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FROM
PlanFund pf
Right Outer JOIN Fund f
Right Outer JOIN FundClass c
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Right Outer Join FundPerformance p
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The following Select statement shows "distinct l.userid" for the available c.id.  I would like to see all the "c.id" even if "distinct l.userid" are NULL. 
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left join labvalues l on c.id = l.companyid
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            2     13
            7      25
Expected Output:  1     12
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                            3     NULL
                            4     NULL
                            5     NULL
                            6     NULL
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