ADO.NET :: Join 3 Tables Using Inner Join?
Sep 8, 2010i need join 3 tables using inner join...
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View 6 RepliesADO.NET :: Join Two Tables Using LINQ?
Jan 24, 2011I need to make a category filter. For this purpose I have two tables "Ingredient" and "Category"
My Category Table looks like this:
[Code]....
And my ingredient table:
[Code]....
I want to join the two tables so when the KategoriID match it should then return all from that category.
[Code]....
[Code]....
ADO.NET :: LINQ To SQL - How Do You Join More Than 2 Tables
Sep 9, 2010 I was trying to find out how I can join more than 2 tables using the LINQ-to-SQL syntax. For instance, joining 2 tables in SQL:
SELECT * FROM Table1 AS T1 INNER JOIN Table2 AS T2 ON T1.Key=T2.Column1WHERE T2.Key='17';
can be expressed as:
var Result = from T1 in DbContext.Table1 join T2 in DbContext.Table2 on T1.Key equals T2.ForeignKey where T2.Key=17 select new { T1, T2 };
But how would I join 3 or more tables using LINQ? For example:
SELECT * FROM (Table1 AS T1 INNER JOIN Table2 AS T2 ON T1.Key=T2.Column1) INNER JOIN Table3 AS T3 ON T3.Key=T2.Column2 WHERE T2.Key='37';
I've been searching and experimenting and I cannot seem to find any informraiton on this. One example I found involves putting the result for the frist join into a temp object, and then performing the second join. I'm not sure performance-wise if that's the same as doing a 3-table join directly using a single SQL statement.
ADO.NET :: How To Join The Two Tables With A Constraint
Nov 23, 2010I have a scenario, I will pass a StatusID , According to that StatusID , The rows will be fetched from a table[tblEventStatus] and newly fetched row has to fecth the data from another table [tblEvent].
Ex: StatusID - Value I am Passing
Table 1: tblEventStatus - Column:SysID - StatusId - EventID
Table 2: tblEvent - Column:SysID - EventID - EventDesc
I want to use the Linq - I tried like this, But It doesnt work
var query1 = from objtblEventStatus in db.tblEventStatus
where objtblEventStatus.StatusId== StatusId
join objev_events in db.tblEvent on objtblEventStatus.EventID equals
(objev_events == null ? null : objev_events.UID)
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SQL Server :: Cross Join Two Tables?
Sep 10, 2010TABLE 1
SELECT I.STUNA
,S.SNO
,SUM(B.AMT * Y.YEAR) AS AMT
FROM STUDENT S
LEFT JOIN INFO I ON S.SNO = I.SNO
LEFT JOIN BONUS B ON S.SNO = B.SSNO
LEFT JOIN YEAR Y ON S.SNO = Y.SSNO
STUNA SNO AMT
JOHN A 10
LISA B 20
ALLEN C 100
TABLE 2
SNO AMT
A 1
B 2
C 3
D 5
I WANT TO HAVE RESULT LIKE THIS (TABLE1 + TABLE2)
STUNA SNO AMT
JOHN A 11
LISA B 22
ALLEN C 103
EDDIE D 5
I TRIED USE THIS QEURY
SELECT I.STUNA
,S.SNO
,SUM(B.AMT) AS AMT
FROM STUDENT S
LEFT JOIN INFO I ON S.SNO = I.SNO
LEFT JOIN BONUS B ON S.SNO = B.SSNO
LEFT JOIN
(
SELECT SNO, SUM(AMT) AS AMT
FROM TABLE2
GROUP BY SNO
) T2 ON S.SNO = T2.SNO
GROUP BY I.STUNA,S.SNO
THE RESULT IS
STUNA SNO AMT
JOHN A 11
LISA B 22
ALLEN C 103
THE "EDDIE" WAS MISS. ALSO I TRY USE CROSS JOIN... THE RESULT IS STILL NOT CORRECT.
ADO.NET :: Can't Group With Linq When Join Several Tables
Dec 9, 2010I have T_articles to save the articles.
each article has authorCode , and categoryCode.
each article can be modified by the author several times.
and I save every modification in the T_articles in a difference row.
now I want to dislpay for each autor:
author name, article name , article category's name, last modified date
In SQL I should to it like that:
[Code]....
I try to write it in Linq so:
[Code]....
so I got error:
[Code]....
and again I got an error:
[Code]....
ADO.NET :: How To Join 3 Related Tables With Linq To Sql
Nov 9, 2010Here's my DB structure:
I have three tables.
User, Details, Optional
User has fields: ID, FirstName, LastName
Details has fields: ID, MyDetails1, MyDetails2, User_ID
Optional has fields: ID, MyOptions1, MyOptions2, User_ID
There is a 1 to many relationship with User & Detail (User ID & Detail User_ID)
There is a 1 to many relationship with User & Optional (User ID & Optional User_ID)
With that said, one user can have many details and/or many optionals
Now I'm trying to build a linq query that will say:
"where user id = x, select FirstName, LastName, all MyDetails1 from every record where User_ID == x, all MyOptions1 from every record where User_ID == x"
After the merge I should have one string that lists the distict user & all of their many fields:
FirstName + LastName + (MyDetails1 + MyDetails1 + MyDetails1..etc) + (MyOptions1 + MyOptions1)
Anyone try this before?
I tried this with JOIN but this doesn't do the trick for what I'm looking for.
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SQL Server :: Join Two Tables In Different Databases?
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View 3 RepliesADO.NET :: Can't Combine "LINQ Join" With Other Tables?
Jan 8, 2011The main problem is that I recieve the following message:
"base {System.SystemException} = {"Unable to create a constant value of type 'BokButik1.Models.Book-Author'. Only primitive types ('such as Int32, String, and Guid') are supported in this context."}"
based on this LinQ code:
[Code]....
How shall I solve this problem to get a class instance that contain with property title and Book-AuthorID?I also have tried making some dummy by using "allbooks" relation with Code Samples from the address
http://www.hookedonlinq.com/JoinOperator.ashx. Unfortunately, still same problem.
I also have taken account to Int32 due to entity framework http://msdn.microsoft.com/en-us/library/bb896317.aspx. Unfortunatley, still same problem.
Using database with 3 tables and one of them is a many to many relationship. This database is used in relation with entity framework
Book-Author
Book-Author (int)
BookID (int)[code]....
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The code that exists now will pull all rows from the OutreachProgram table. I can't figure out how to add the UserInfo table to the query to make it work.
JsonGrid <OutreachProgram> grid =
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SQL Server :: Get All Data From Tables When Inner Join Is Not Enough?
Sep 28, 2010Suppose I have two tables "t1" and "t2"
t1 :
id FirstName Age
1 Joe 22
2 James 33
3 Bart 28
t2:
id LastName
1 Coymer
2 Manes
I can combine the data from the two tables using an inner join.
1 Joe 22 CoyLap
2 James 33 Manes
The problem though is that the person "Bart" with an Id of 3 is left out because he does not have an entry in the second table.So how can I include Bart in the output in such a way that the output might look like this:
1 Joe 22 CoyLap
2 James 33 Manes
3 Bart null null
Or spaces can instead appear for Barts last name and age instead of null.Basically I just need Bart in the output as well even though he has no age and last name.
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Aug 23, 2010I have a select query which is executing well. Now, I want to add one more field to that query. That field is not in the current query table, It is in the another table.
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SQL Server :: How To Join 2 Tables To Get Specific Results
Jan 13, 2011I have 2 tables:
Attributes
AtrributeVales
attrId(PK) name
id (PK) attrId(FK) value
1
color 1
1 green
2
size 2
2 small
3 1 red
4 2 medium
I need to build some query that will return something like this:
Color Size
Green small
Red medium
ADO.NET :: JOIN Tables From Different Physical Database Servers?
Jan 11, 2011Basically I want to JOIN a table from a MySQL database to a table from a MSSQL database. The reason is because I don't own the MySQL database and I only have SELECT privileges to it. For my ASP.NET application, I need to create two new tables. I have my own MSSQL DB and I have an SA account for it. Is this possible?
This is how I connect to MySQL:
[Code]....
I think the problem here is that I need 2 open database connections for the DataAdapter to use?
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Mar 5, 2011I have two tables: Projects and ProjectsData and I want to execute query with join and get the result in the View.
In the Controller I have this code:
[Code]....
What I should use in the View to extract this data. I tried that:
[Code]....
but it doesn't work...
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Aug 18, 2010I need to join two tables accross two different databases and return an ADO dataset.
ie: select * from database1.table1 a inner join database2.table2 b on
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ADO.NET :: Entity Framework - How To Join Tables Without LINQ And With Only String
Sep 30, 2010I have a question about Entity Framework. answer if you know answer on this. I have such query :
[Code]....
Particularly I want to join few tables in one query, but I can NOT use LINQ and can NOT use ObjectQuery with objects mapped to DB fields inside my query. Because each entity creates dynamically. So this is what i
can NOT use : [URL]
The question is can I use something like this instead of using objects?
[Code]....
The purpose is to use Join method of ObjectQuery with syntax as in Where method :[URL]
SQL Server :: Customer Referenced In Multiple Tables Vs Big Join?
Dec 23, 2010Just looking through database design and wondering what would be the better option. I have customers, who all have orders, pickings, deliveries and invoices. Now an invoice can't exist without a delivery, a delivery can't exist without a picking and a picking can't exist without an order. So I could set the tables up in a linear fashion. e.g.
Customer -> Orders -> Picking -> Delivery -> Invoice
then in Orders, there would be an ID field, with a customerID field and in Picking, there would be an ID field, with an orderID field and in Delivery, there would be an ID field, with pickingID and in Invoice, there would be an deliveryID field. Linking them altogether, again, in a 'linear' fashion.
The problem is if I want to get, say, all the invoices for a specific customer, my query would be something like
[Code]....
My other option would be to have in a customerID column in each of the tables meaning a much easier query
[Code]....
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Jan 29, 2010I have 2 different datatables. 2 datatables from 2 different servers.
My first datatable is this:
SELECT DISTINCT a.name, a.create_date, a.Modify_Date, a.Object_Id
FROM dbname.sys.objects a
and my 2nd datatable is the same, but from a different server connection string
SELECT DISTINCT b.name, b.create_date, b.Modify_Date, b.Object_Id
FROM dbName.sys.objects b
Basically, I want to compare which procedures are on one server and not the other (dev and prod)
So after I have my 2 datatables i want to create a data relationship on the name and then do a left join to see whats in a and not b.