DataSource Controls :: Outer Join In LINQ Getting My Desired Result?
Jun 26, 2010
I'm trying to achieve an outer join in LINQ but I'm not getting my desired result.There are two relational tables between Fruit_Name and Fruit_Ripe.The Fruit_Ripe table has a boolean field (IsRipe) that I use in my condition.The condition let me show all fruits that is not yet rippen (false) or fruits that isn't inputted yet in Fruit_Ripe table.
Dim fruit_salad = From myFruit In _DataContext.Fruit_Name
Group Join myRipeFruit In _DataContext.Fruit_Ripe On myFruit.fId Equals myRipeFruit.fId Into Group
From fruitty In Group.Where(Function(d) Not d.isRipe =
For context: First of all, I am new to LINQ, as I have been using SubSonic for quite some time now.
I have two tables, Users, and Affiliates. They both have a very typical schema. The FK that joins them is the UserId field, which is in the Affiliates table. I want to create a LINQ query that pulls the Username from the Users table using the AffiliateId value. The AffiliateId is a primary key of the Affiliates table.
I have tried to accomplish this using many variations of the following code:
[Code]....
In the above query, I expect to get a single row result set. However, I instead receive the entire table of results.
How can I make this work? I have yet to see an example or article out there to do what I am trying to do.
I know I'm missing something here but I can't figure out what it is. I've got a query joining three tables....accounts, payments, and a table linking the two (there is a M:M relationship).I'm trying to pull a list of all accounts in the account table that have a payment that needs to be resequenced, and also the maximum payment priority if there are any payments that haven't been fully paid. If all payments HAVE been fully paid, I want to return a 0.
It's that last bit of logic that I can't get right. If I include that in the where clause, I get only the accounts that have a payment that hasn't been fully paid. If I take it out, I get all the accounts I get, but I get the highest payment priority whether or not the payment has been fully met.
Here is the query....how do I include the where clause criteria but still include all accounts?
I'm having trouble doing a left outer join with multiple generic lists tables. I've been researching for hours and there isn't a whole lot out there on this subject and VB (at least what I found).
I have the following Linq query:
Dim DataForGridview = (From s In S1 _ Join c In C1 On c.ID Equals s.ID _ Join v In V1 On v.ID Equals s.ID _ Select New With { _ .dataFieldID = s.ID, _ .dataField1 = s.dataField1, _ .dataField2 = c.dataField2, _ .dataField3 = c.dataField3, _ .dataField4 = c.dataField4, _ .dataField5 = v.dataField5 _ }).ToList()
S1 has a count of 30. V1 has a count of 20. C1 has a count of 10. This query joins the three but ends up with a count of only 10 based on the datakey ID and, of course, only shows those 10 in the gridview.
I would like to show all 30 from S1 in the gridview with blank fields wherever V1 and C1 do not have data. From what I've read I need to do a left outer join. However, all examples I've found are with two datasets.
I've tried multiple times expanding on what I've found by changing it to a group join and also adding the .DefaultIfEmpty() property in the query, but nothing is working.
How can I change the above query to a left outer join with these multiple tables?
i have a form that my i use to look up whether or not there is an email address in the database. i wrote a query with this basic structure:
select *
from table A, table B
where table A.email = "email" or table b = "email"
i though that would return all instances that the email occurred in either table. what i am getting back is a bunch of null or other unrelated records from table A with a matching email in table B. the thing is, these two tables primary key to join them. i thought i wouldnt need to do that though in this case.
here is the actually query i am using if it makes things more clear:
I want to get data from Projects(which have CourseId) and related CourseName from Courses table.
I have written following code:
var projects = from n in db.Projects join c in db.Courses on n.CourseId equals c.ID orderby n.Name select new { Project = n, Course = c }; return View(projects.ToList());
and I get error:
The model item passed into the dictionary is of type 'System.Collections.Generic.List1[<>f__AnonymousType22[ProjectManager.Models.Project,ProjectManager.Models.Course]]', but this dictionary requires a model item of type 'System.Collections.Generic.IEnumerable`1[ProjectManager.Models.Project]'.
What I need to do in Controller and in View to display this data?
i am trying to use predicatebuilder for a linq to sql query but i cant seem to get a join to another table. in my model, i have a table for applicants and another for job applications.. each applicant can have several job applications.
i expect in linq to sql to be able to do something like;
p.jobapptable.jobappdate where p is the applicant.
this isnt the case..i am trying to use predicatebuilder to search through applicants based on the job applications they have made? how`can i get linq to sql to show the foreign key relationships?
I have two tables namely "CategoryMapping" and "PartnerCategory"...The partnercategory table has foreign key with categorymapping on CategoryID...
let us say categorymapping should be filed first then partnercategory should be filed based on the categories defined in categorymapping. For example my two tables have the following data:
I have one sproc with Dynamic Temp Table. Sproc returns dynamic temp table rows and when I drag and drop the sporc on to Linq to Sql Designer I am not getting Return Type as "(Auto-generated Type).
I have 9 tables i need data out of.. 8 of those tables will always just return 1 row of fields that i need. the 9th table can contain many records.. So what i need is a few fields out of each of the 8 tables and then ALL records from the 9th table.. so i know that because there will be multiple records in the 9th table returned, that the fields i pull from the other 8 tables will contain duplicate information and thats fine since i will be displaying the individual records from table 9 on their own page..So everything could be for the same vendor, except for the date in the 9th table that contains specific dates and details about each record returned.When i review the execution plan im getting an yellow exclamation icon on a nested inner join and has this message as the warning: No Join Predicate
Here is what i have, but is returning incorrectly, way to may records, seems to be stuck in a loop.. then below that, i have one that returns the correct number of records, but everything except one column is duplicate, all the TR columns should be unique in the values stored in them.. the rest should all be duplicates, just because its the same vendor, so all the other information will be generic information about that record.
[Code]....
This FROM and WHERE return the correct number of records, but the fields are all duplicated except the last column with is transaction_date, seems that the 3 TR fields are being populated with the first records data or something.. not sure.
To write a join query with or condition. It means a query has two inner join, here it is possible to fetch the records, if one inner join is true and other is false. I got a record when only two join conditions are true.
I'm trying to build a linq2Entity/gridview function for a forum, that draws data from multible tables.The result should be: Get the latest 10 threads that user(xx) has replyed in, that is not disabled or has a subject that is not allowed.Include information on the last post, thread owner user, and last post user, in each thread. ere is my code... is returns the correct threads and some that should not be there.
I have this ListView that has a Drop Down List.Everything works fine (I think/hope) except that the drop down list are not showing its result correctly.This is the code.
Front-End [Code]....
The code behind consist of the page_load and the ItemDataBound [Code]....
I am using Access as my database for an ASP.NET project/Vb.NET. However it seems as though Access does not support Full Outer Joins.
Basically I have two tables in one query used to populate a Gridview. I need to list all available companies and their employee count even if that Company does not have any employees and return the result as 0. Is there anyway I can do this in an Access query. The relationship layout is the tblCompany has a 1 to Many relationship with the Employee table.
Below is what I would like have happen however access does not seem to recognize FULL OUTER JOINS.
SELECT DISTINCTROW tblCompany.Comp_Name, tblCompany.Comp_CompanyID, tblCompany.Comp_CreatedOn, tblCompany.Comp_Status, Count(*) AS [Employee Count] FROM tblCompany FULL OUTER JOIN tblEmployee ON tblCompany.Comp_CompanyID = tblEmployee.Comp_CompanyID GROUP BY tblCompany.Comp_Name, tblCompany.Comp_CompanyID, tblCompany.Comp_CreatedOn, tblCompany.Comp_Status;
I'm having a problem with my Linq to XML query. I'm getting the result data I want, but it's nested so deep that there must be a better way.Here is my XML:
[Code]....
I'm trying to get a list (simple string[]) of all Item IDs where Category Names contains "Other".Here is my Linq:
[Code]....
[Code]....
Here is a snapshot of my result from Visual Studio:The results I want are there ("item100", "item400", "item500"), but buried so deeply in the results var.
I have three tables nameTbl contains the following columns: BarID, Name, Description locTbl contains locID and Location namelocationTbl contains BarID(from the nameTbl) and locID(from the locTbl)
