How To Return Null Values For Non-exist Record On A Left Join Statement

Oct 16, 2004

I have table Products and Orders that has the following columns:





table Products: ProductID, ProductName


table Orders: OrderID, ProductID, OrderDate, Quantity, Price





The Orders table contains orders placed on all the dates. I want to obtain a list of orders for a particular date, if there is no order for a product on the requested date, I want to return null values for the Quantity and Price fields.





I tried the following select statement:





select Products.ProductName, Orders.Quantity, Orders.Price from Products left join Orders on Products.ProductID = Orders.ProductID where Orders.OrderDate = '10/16/2004'








Where, there are a total of three products (A,B,C) in table Products. Product-C has no order on 10/16/2004, but I want it to return :





ProductName / Quantity / Price


Product-A 5 1.89


Product-B 6 2.43


Product-C null null





Obviously, my sql statement won't work becaue the where clause will filter out Product-C.





Could anyone help me figure out how to modify my sql code to get the resultset I want?





Thanks in advance.

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How To Write A Query To Return Null For Non-exist Record In An Outer Join.

Jun 2, 2004

I have two tables:

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2. tblProductCodes
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The 2nd table is for storing product codes for customers, in other words, one product can have different ProductCode for different customers. But some customers do not have ProductCode for a ProductID.

I want to create a query to return all the Products and its ProductCode (null is valid) for a specific customer.

I tried:

SELECT dbo.tblProductCodes.ProductCode, dbo.tblProductCodes.CustomerID,
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But the query left out all products that does not have ProductCode value in tblProductCodes table for CustomerID = 2. I want all the ProductName returned from query and render null or empty string for ProductCode value if the code does not exist in tblProductCodes table for the customer.

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May 16, 2005

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Hello,

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Edit: This is the query I have tried:


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I'm sorry, this question has a pretty long preamble, but bear with me as this will fully explain my problem, and save a number of clarification questions.I am using Visual Web Developer 2005 Express, with SQL Server 2005. After reading a Microsoft article saying that it was much better to use a three tier architecture with data adapters than to write explicit queries, I have used this approach extensively, and generally it works very well.  Typical code patterns are: -        Dim taPassenger As New ShippingTableAdapters.VPassengerTableAdapter        Dim tbpassenger As Shipping.VPassengerDataTable        Dim trpassenger As Shipping.VPassengerRow        .....        '   to process all passengers from a voyage: -        tbpassenger = taPassenger.GetDataByVOYid(Voyageid)        For Nbr As Integer = 1 To tbpassenger.Count            trpassenger = tbpassenger(Nbr - 1)             '    I now have the row available in properly-typed fields, eg trpassenger.vpxName             ...        Next        '   to read and process a single passenger        tbpassenger = tapassenger.GetDataByVPXid(VPXid)        trpassenger = tbpassenger(0)The table adapter has been created with Insert,Update, Delete methods.   Thus you can assign values to row fields, and then update the row: -        trpassenger.VPXName = "New Name"        ....        tapassenger.update(trpassenger)There are actually several overloads of the update method:  you could have written a field list, like this, where the names (VPXid etc) would be defined in my program as variables of the appropriate type for the corresponding column.        tapassenger.update(VPXid, VPXName, VPXAge, ....HOWEVER,  this doesn't work properly if you have non-string data that could be null.   Thus if the fourth field is a foreign key that could be null, if you write        Dim VPXVoyId as Nullable(of GUID)        VPXVoyid = nothing        tapassenger.update(VPXid, VPXname, VPXAge, VPXVoyid, ...or         Trpassenger.VPXVoyid = Nothing        tapassenger.update(trpassenger) you do NOT put a null value into the database.  Instead you store a value of "00000000-0000-0000-0000-000000000000".   You can solve this annoying problem in two ways: -A.   If you will ALWAYS be storing a null value at this point of your program, then simply write the update statement like this: -        tapassenger.update(VPXid, VPXname, VPXAge, Nothing, ...Here "Nothing" actually means "DBNull" even though it doesn't mean this when used in a normal VB assignment (and neither does DBNull).B   You can use the SetxxxxNULL method: -        If trpassenger.VPXVoyid = nothing then             trpassenger.SetVPXVoyidNull        End If        tapassenger.update(trpassenger) Thus when the program logic is complex and there are many paths to the update statement I will often put statements such as this in front of the update statement, using SetxxxxxNull for all non-string values that may be null.  You don't need to worry about string values because the Nullvalue property can be used to simply say that Null values are empty, and it all works properly, but for reasons unknown Microsoft have prohibited this for other data types. Now at last we get to my question, which is "How do I do the equivalent for an Insert?"   tapassenger.insert does not have any overloads, and the only form is  tapassenger.insert(field list).   But this creates the problem above:  if VPXVoyid = nothing then I insert the not-null value of "00000000-0000-0000-0000-000000000000".   If I COULD use the form tapassenger.insert(trpassenger), then I'd have another problem: if you haven't set trpassenger (for example with trpassenger = tbpassenger(0)) then it will not exist, so you will get an exception when you try to reference it.  Yet you can't write    If isnothing(trpassenger) then       trpassenger = new shipping.vpassengerrow)         (I've tries this both as an assignment, and as a Dim statement)    end ifSo far I can think of only two solutions, both awful: -a/    Use multi-choice logic to choose an appropriate insert statement.  If there is only one or two possibly-null fields, I could write:-        If field4 = nothing then            trpassenger.insert (VPXid, VPXname, VPXAge, Nothing, ..        However if there is more than one possibly-null field, you need (2 to the power of  nbr-of-possibly-null-fields) insert statements, with of course a lot of testing to choose which oneb/    I could insert the record with nulls, then read it back and update it.  Surely there is a better way!   Help! Thank you, Robert Barnes.    

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Apr 16, 2014

I'm using a Merge statement to update/insert values into a table. The Source is not a table, but the parameters from a Powershell script. I am not using the Primary Key to match on, but rather the Computer Name (FullComputerName).

I am looking on how-to return the Primary Key (ComputerPKID) of an updated record as "chained" scripts will require a Primary Key, new or used.As an aside: the code below does return the newly generated Primary Key of an Inserted record.

CREATE PROCEDURE [dbo].[usp_ComputerInformation_UPSERT](
@FullComputerName varChar(50) = NULL
,@ComputerDescription varChar(255) = NULL
,@ComputerSystemType varChar(128) = NULL
,@ComputerManufacturer varChar(128) = NULL

[code]....

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Jul 19, 2006

Hi all
My query has some inner joins to some tables. And problem is when any ON clause get null as value, the correspondent record is not displayed.
SELECTTableA.A, TableB.AFROM TableAINNER JOIN TableB ON TableA.A = TableB.A
What I did try:
SELECTTableA.A, TableB.AFROM TableAINNER JOIN TableB ON TableA.A = TableB.A OR TableA.A IS NULL
(but It generates redundant values from TableB)
I need to show all values even that value from Tablea is null
Thank a lot for any help

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Oct 18, 2013

I've got 2 tables of towns. I'm using outer join because i need all the town from both tables. However I'm sometimes getting duplicates.

My query

select a.town, b.town
from a
outer join b on a.town = b.town
group by a.town, b.town

How to stop getting null values?

portsmouth null
portsmouth portsmouth
southampton southampton
null southampton
TownA null
null TownB

I'm looking for distinct values like this:

portsmouth portsmouth
southampton southampton
TownA null
null TownB
etc...

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Jun 29, 2015

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When I run the following query, I get the required result except the rows for CID 500 for which PID is NULL in table T1. I want the rows for CID 500 as well with PID values as NULL.

SELECT  A.CID, 
A.ANI,
A.PID,
B.RD
FROM T1 AS A CROSS APPLY GIVERD(A.PID) B

CREATE TABLE [DBO].[RDTEST](
[PID] [INT] NULL,
[RD] [INT] NULL
)

[Code] ....

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Sep 21, 2007

Hello all,
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 I have a SqlDataSource"
 <asp:SqlDataSource ID="SqlUpsertAffiliateDetails" runat="server" ConnectionString="<%$ ConnectionStrings:connectionstring %>"
SelectCommand="SELECT am.affiliate_id AS AffiliateId, am.member_id AS MemberId, m.First_Name, m.Last_Name, am.category_id AS CategoryId, ac.category_name, am.profile_web_address AS WebAddress, am.profile_email_1 AS Email, am.comments AS Comments, am.date_modified FROM tAffiliateMaster AS am WITH (NOLOCK) INNER JOIN tAffiliateCategories AS ac WITH (NOLOCK) ON am.category_id = ac.category_id INNER JOIN rapdata..Member AS m WITH (NOLOCK) ON am.member_id = m.Member_Number WHERE (am.affiliate_id = @AffiliateId)"
UpdateCommand="spUpsertAffiliateProfile" UpdateCommandType="StoredProcedure">
<SelectParameters>
<asp:QueryStringParameter Name="AffiliateId" QueryStringField="affiliate_id" />
</SelectParameters>
<UpdateParameters>
<asp:Parameter Name="Action" Type="Byte" DefaultValue="2" />
</UpdateParameters>
</asp:SqlDataSource>
 And my SP:/* 09-19-07 Used to update affiliate profile */

CREATE PROCEDURE spUpsertAffiliateProfile
@Action tinyint,
@AffiliateId int,
@MemberId int = -1,
@CategoryId int,
@WebAddress varchar(50),
@Email varchar(50),
@Comments varchar(1500)
AS

SET NOCOUNT ON

-- Find errors first, check is not needed if deleting
IF @Action <> 3
IF NOT EXISTS (SELECT Member_Number FROM rapdata..Member_Association WHERE Member_Number = @MemberId AND Status = 'A' AND Association_ID = 'TRI' AND Bill_Type_Code LIKE '%AF%')
BEGIN
SELECT retval = 'A qualified member ID was NOT found. Action Failed.', errorcount = 1, 0 AS affiliate_id
RETURN
END
IF @Action = 1
IF EXISTS (SELECT member_id FROM tAffiliateMaster WHERE member_id = @MemberId)
BEGIN
SELECT retval = 'This member has already been listed. Action Failed.', errorcount = 1, 0 AS affiliate_id
RETURN
END


IF @Action = 1 AND @AffiliateId = 0-- insert
BEGIN
INSERT INTO tAffiliateMaster
(member_id, category_id, profile_web_address, profile_email_1, comments)
VALUES
(@MemberId, @CategoryId, @WebAddress, @Email, @Comments)

SELECT retval = 'Record Entered', errorcount = 0, @@IDENTITY AS affiliate_id
RETURN
END

ELSE IF @Action = 2 AND @AffiliateId > 0-- update
BEGIN
UPDATE
tAffiliateMaster

SET
category_id= @CategoryId,
profile_web_address=@WebAddress,
profile_email_1=@Email,
comments=@Comments

WHERE
affiliate_id = @AffiliateId AND member_id = @MemberId

SELECT retval = 'Record Updated', errorcount = 0, @AffiliateId AS affiliate_id
RETURN
END

ELSE IF @Action = 3 AND @AffiliateId > 0-- delete
BEGIN
DELETE
tAffiliateMaster

WHERE
affiliate_id = @AffiliateId

SELECT retval = 'Record Deleted', errorcount = 0, 0 AS affiliate_id
RETURN
END
GO

 My question is how will I be able to return the retval? Will I need to do it within the code behind of the SqlDataSource Updated Event?
 Thanks!
 

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Nov 14, 2007

Hey guys,

This is what I think and hope is a fairly straight forward SQL question

Essentially, I have a table which has the following columns that are relevent to my question:

PROJID
ACTIVITY_NAME
COMPLETION_DATE

Rows in this table are, for example:

PROJID ACTIVITY_NAME COMPLETION_DATE
1 Prepro 10/12/2007 3:42:30
2 Prepro 10/13/2007 9:16:27
2 QA 10/13/2007 10:00:01
2 Delivery 10/14/2007 09:31:12
etc.

So, really the key is the PROJID & the ACTIVITY_NAME (really, there's a unique column ID, but for this question, I'll leave it at that).

(Though this should be much easier to accomplish in code, the system is not built that way so) Is there a good way that I could return a status for a given PROJID based on whether a row exists for a given PROJID). In other words, ultimately, I would like to return something like this:

PROJID LAST_ACTIVITY
----------------------------------------------
1 Prepro
2 Delivery

where the activity order (in this case) is Prepro, QA, Delivery. So because a Delivery row exists for PROJID 2, then the LAST_ACTIVITY would return "Delivery" and because only Prepro exists for PROJID 1, the LAST_ACTIVITY returned would be Prepro

I really appreciate the help

Thanks,
Steve

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Sep 4, 2007

Hi.
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