Left Join / Group By And Sum Where Related Records Do Not Exist

Dec 9, 2010

I am trying to accomplish the following:
SELECT Table1.prod_code, SUM(Table1.prod_bal) AS TotalProdBalance
FROM Table1
LEFT OUTER JOIN Table2 ON Table1.prod_code = Table2.prod_code
WHERE Table2.prod_code IS NULL
GROUP BY Table1.prod_code
HAVING (SUM(Table1.prod_bal) <> 0)
How to translate this to Linq using VB.net syntax?

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Left Join Linq To Entity's .net?

Apr 11, 2011

I can't figure out that linq to entity query syntax. My problem is that if the value of the Calls table is null then noting comes up, I want to make something like a left join to get 'all' rows from the Calls table.I tried to group it but I can't figure out the correct way to write it.

Dim TicketQuery As ObjectQuery = From c In EnData.Customer _
Join t In EnData.Calls On t.CustomerID Equals c.CustomerID _
Join Status In EnData.Lists On t.Status Equals Status.ListValue _

[code].....

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LINQ Dataset LEFT JOIN?

Jun 14, 2012

i think i have not represented my question correctly here My LEFT OUTER JOIN MSDN reference is here to visualize my problem in access databaseTABLE "T1"1234567TABLE "T2"1,sunday2,monday i need output as 1,sunday2,monday34567 i need it to done through LINQso far i did is here

Dim RIGHT_table As DataTable = ds1.Tables("t1")
Dim LEFT_table As DataTable = ds2.Tables("T2")
Dim OutPut = From LEFTsource In LEFT_table.AsEnumerable(), RIGHTsource In RIGHT_table.AsEnumerable() _

[code]...

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Linq Left Outer Join?

Apr 21, 2011

I ultimately what I needed is generic function which would take two datatable and and 2 tablekeys and return Joined datatable. So here is my first step to solve it.

How Can I write Linq example of following T-SQL example in VB?

SELECT * FROM
Table1
LEFT OUTER JOIN
Table2
ON Table1.key = Table2.key

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LINQ To SQL Left Outer Join VB?

Nov 9, 2011

I cannot get this to work with LINQ to SQL vb.net?

SELECT a.FLD_ID, a.FLD_SUBJECT, a.FLD_GROUP, a.FLD_SUBMITTED, a.FLD_LASTACTION, a.FLD_CLOSED
FROM TBL_WSS_TT_TICKET a LEFT OUTER JOIN
TBL_WSS_TT_ALLOW b ON a.FLD_ID = b.FLD_TICKET_REF
WHERE (a.FLD_USER = 'user') OR (b.FLD_USER = 'user')

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Use LINQ To Left Join 2 Datatables?

Nov 10, 2011

I have two UNTYPED datatables: "Shelfs" and "Books". Data came from different databases.

I must create a "left join" relationship because I want a list of ALL shelfs and books (if they have any).

Dim dset As New DataSet
dset.Tables.Add(dtShelfs)
dset.Tables.Add(dtBooks)

[Code].....

I spent hours googling around, but all examples I found were only applicable to strongly typed dataSets, and how to build queries (not to get the data)

I could solve this the "easy" way: by looping both datatables and sending the rows to a third one, but I want to do this the "right" way and, of course... LINQ exists to make things easier and I don't know how to use it

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.net - Subsonic3 LINQ Left Outer Join?

Mar 25, 2011

I am using Subsonic3 and would like to get a Left Outer Join between two tables. Here is the tested SQL

SELECT a.*
FROM vwVendor a
LEFT OUTER JOIN dbo.pubvenmap b
on a.vend_no = b.vend_no
where b.vend_no is null

[Code]...

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Left Join Of Two Data Table Into One Two DataTabale?

Aug 18, 2011

Here is my Scenario

I Have First Datable :TableA
**Item** **Place**
ItemA PlaceA

[code].....

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LINQ -> Extra Condition On Left Join?

Aug 19, 2010

I'm basically trying to emulate a query like the below in LINQ:

DECLARE @id INT
SET @id = 1
SELECT
q.txtLQRdisplayName AS DisplayName,

[code]....

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Linq Left Outer Join Null

Sep 27, 2010

I've got what I think is a working left outer join linq query but I'm having problems with the select because of null values in the right hand side of the join.[code]I want to return all of e and one column from c called tClassCode. I was wondering what the syntax would be. As you can see I'm using vb.net.[code]If i remove the c.tClassCode from the select the query runs without error. So i though perhaps i needed to do a select new but i don't think i was doing that correctly either.

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VS 2008 LINQ Dataset LEFT JOIN?

Jun 13, 2012

i am having 2 tables one table stores the WEEK-days another table stores the WEEK-days + other fields.i need the LINQ query to return all WEEK-days + other fields just like SQL LEFT JOIN query so far i did is [code]....

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VS 2008 Linq To DataSet Left Join?

Feb 10, 2011

The query works but only retrieve the joined rows, i want to retrieve all rows in the first datatable.My current query:

vb.net
Dim q = From regE In (From registoE In _dtRegistosAEnviar.AsEnumerable
Group registoE By colaborador = registoE.Field(Of String)("Colaborador") Into grupoE = Group
Select New With {

[code]....

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Write For 3 Tables Left Join Statement?

Mar 11, 2010

Table 1 has fields: A, B, C, Table 2, there are fields: D, E, F, Table 3 has fields: G, H, I

Connect the condition that A = D and F = I

provide a look at Table A left join B, C of the SQL statement

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Asp.net - SQL Query Conversion To LINQ Left Outer Join?

Jul 4, 2009

I've looked all around and spent way to long trying to convert this SQL statement into a Linq statement in VB. I'm sure it would be a good example for others out there - the statement is trying to pull products that have a many-to-many relationship with product categories, and the categories have a hierarchy of parents/children.

Here is the query I am trying to convert:

SELECT P.ProductID, P.ProductName, P.ProductSlug, P.PartNumber
FROM Products AS P
INNER JOIN Products_Categories AS PC ON PC.ProductID = P.ProductID

[code]....

I can get up to the point where I am trying to say "WHERE ... (P_Cats.Parent = 9)" but can't figure that part out.

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.net - Linq-to-Entities: LEFT OUTER JOIN With WHERE Clause And Projection?

Oct 18, 2010

how to translate a simple SQL LEFT OUTER JOIN with a two condition where clause into a working Linq-to-Entities query. There are only two tables. I need values for all rows from Table1, regardless of matches in Table2, but the WHERE clause uses fields from Table2. In SQL, the two parameters would be Table2WhereColumn1 and Table2WhereColumn2, and the query (which works) looks like this:

SELECT t1.Table1Id,
t1.FieldDescription,
t2.FieldValue

[code].....

I've tried using Group Join with DefaultIfEmpty(), as well as an implicit join (without the actual Join keyword), and I only get rows for items that have values in Table2. I'm sure this won't help, but here's an example of the Linq I've been trying that doesn't work:

Public Shared Function GetProfilePreferencesForCedent(ByVal dc As EntityContext, _
ByVal where1 As Int32, _
ByVal where2 As Int32) _

[code].....

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Unable To Use A Linq-to-sql Statement And Getting A Left Outer Join To Work?

Apr 29, 2010

i'm having troubles with a linq-to-sql statement and getting a left outer join to work. here is a sample of two tables i'm trying to join and my code that i've wrote.

Table1 Table2
f1 f2 f3 f4 fID f1 f2 f3 f4
val1 val2 val3 val4 1 val1 val2 val3 val4

[code]....

Instead I'm returning ALL values from table 1. I need to return all values from the left outer join where tbl2.fID is null.

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.net - Group Join With Multiple Conditions And One Of Them Being With A Constant?

Jan 29, 2010

Here is a snippet of my (VB) LINQ:

From event_evn In xmlEvents.Descendants("event_evn") _
Join genre_gnr In xmlGenre.Descendants("genre_gnr") On event_evn.Element("evn_gnr_id") Equals genre_gnr.Element("gnr_id").Value _
Group Join eventdata_eda In xmlEventData.Descendants("eventdata_eda") On _
eventdata_eda.Element("eda_evn_id").Value Equals event_evn.Element("evn_id").Value And _
eventdata_eda.Element("eda_dty_id").Value Equals "15" _

[Code]...

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Can't Use A Where Clause On Both Tables In A LINQ Group Join?

Jun 7, 2011

Here's what I want to do:

Dim queryX = From m In db.Master
Where m.Field = value
Group Join d In db.Detail
On m.Id Equals d.MasterId Into Group
Where d.Field = value

In English, I want to join the master and detail tables, specifying conditions on each. But this causes the following compiler error:

"Name 'd' is either not declared or not in the current scope."

It works if I put this same condition in functional form:

Group Join d In db.Detail.Where(Function(x) x.Field = value)

but I think this is more typing, harder to understand, and introduces that irritating dummy variable. I really would prefer to use the query comprehension syntax. Is there a way to accomplish this?

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LINQ Left Outer Join W/ Date Range Restriction On Right Table?

Feb 4, 2011

I have two tables, a LP_task table and an lp_Update table. I want a complete list of tasks and only updates that were posted during a specific date range. LINQ doesn't seem to support any other join criteria but 'equals'or each task. I want all tasks (left table) even if they don't have an update. (Left Outer Join)

Dim TasksData = (From t In db.LP_Tasks _
Group Join up In db.LP_Updates On t.ID Equals up.TaskID Into upds = Group _
From u In upds.DefaultIfEmpty _

[code]......

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Adding Related Records In LINQ?

Mar 12, 2009

Processing an XML file with LINQ to add records into a table in a SQL Server database via a data context. As we are adding records we need to assign the parents in various other tables. Most of the time we can find the existing parent and use it but sometimes we will need to create a new parent.Thought we could do this like this:

Dim defaultPub As publication
defaultPub = New publication With {.name = e..Value}
Dim pub = _Data.publications.Where(Function(s) s.name =

[code].....

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Delete Records From Related Tables

Jun 6, 2011

i have 3 tables in ms access that is patient , NOK,and admission they have related fields, i am using vb 2005. when i delete a record from the patient table i want the related records from the other tables to be deleted.

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VS 2008 Error - Related Tables - Can't Update Records

Mar 1, 2010

Using a datagrid, binding to one table, and related to one combobos, I cant update records, cause gives me a violation error. I'm not changing the primary key, so, I dont undersatnd cause this happen. I prepair a example of this error, and it was attached to this message.

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Records Exist, Save If Not?

Mar 7, 2012

I am new in VB .NET 2010, I am trying to code ADD, EDIT, UPDATE, DELETE simple function, I use SQL Server 2008, I have done saving function but Im stack with duplicate records, How to code if records exist then prompt a message, if not then it will save.

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Fill Up A Data Grid View With Records Of Two Related Tables?

Mar 16, 2010

I try to fill up a data grid view with records of two related tables. Beneath you can find the code I use to handle this.

The first table �GemeentenT� has the following columns.

GemeenteId Primary key
GemeentePostnummer
GemeenteNaam

[Code].....

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Forms :: Display A Button If No Records Exist?

Dec 7, 2009

I would like to display a button if no records exist and hide the same button if a record exists.

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Sql Server - Join Tables Based On A Column Without Creating Records For Every Combination

Mar 20, 2012

I have two tables as follows:

Customer | Product
------------------
A | Car
A | Bike
A | Boat

[Code].....

If I use a normal JOIN then I get a list of friends for every separate product. I just want the two lists once.

The output lists with '-' need not be table cells, they can be <ul>s.

How can I achieve this? I would like to bind to ASP.net GridView. Should I try to do it all in one query, or use multiple queries and somehow add them both to the same Grid?

Each row actually forms part of a long report. Essentially each row of the report contains Customer ID, a bunch of other fields which match one-to-one with Customer ID, then the two lists for each Customer ID I described. Perhaps I can use a separate query for each list, then manually add each list to the grid on RowDataBound or similar?

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Datatables Left Join Linq - Joining 2 Datatables And Have The Joined Datatable As Result

Jun 1, 2012

I'm having a hard time joining 2 datatables and have the joined datatable as result. First datatable (labels) holds data including a printerid. Second datatable (printers) holds printer references (id > unc). I would like to have as endresult (joined) a datatable with all data from the first datatable with the field (unc) of the second datatable. [Code]

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LINQ: "Group Join" Functionality Joining Three Tables

Jul 21, 2010

I'm working on becoming familiar with LINQ, and getting my head around the syntax and usage.

[Code]...

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Sql Server Query To Group Records?

May 9, 2011

i would like to select from the following table:

PostTable

feed dateinserted count
box1 2011-05-28 11:00 1000[code].....

the total number of records for the previous day where the feed is, 1, 3 and 5 i.e.the feeds I need to retrieve totals for will just be selected based on what I need for instance it could be box4 and box 5...not specifically odd and even...I hope this makes it more clearer..what I have for all records:

select sum(count) as [total] from PostTable where Cast(dateinserted as DATE) =
CAST(getdate()-1 as DATE)

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Reporting Services - Input Parameter Needs To Return All Records If Left Blank

Jul 9, 2009

I have an input parameter for my stored Proc, Instead of choosing available values from a drop Dwn, the customer wants an empty input box that when left blank returns all records. the parameter type is numeric(6,0) in the Db. I have not found a way to leave the input blank and retrieve all records. my default value for all records is '-99' and also is declared as the default value for the param in the proc.

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