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Published on 2010-04-05T05:03:08Z
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Can anybody can explain in detail how to implement a left outer join in LINQ?
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This article demonstrates how to use LINQ on DataTable, XML Data using LINQ to XML and SQL server data base using LINQ to SQL Classes.
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I am running a query using Linq2SQL that comes down to following query:
DateTime? expiration = GetExpirationDate();
IQueryable<Persons> persons = GetPersons();
IQueryable<Items> subquery = from i in db.Items
where i.ExpirationDate >= expiration
…
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The way data can be retrieved in .NET. LINQ provides a uniform way to retrieve data from any object that implements the IEnumerable<T> interface. With LINQ, arrays, collections, relational data, and XML are all potential data sources. Why LINQ?With LINQ, you can use the same syntax to retrieve…
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I have a Logic layer that references Silverlight's System.Xml.Linq dll and a GUI that is in WPF (hence using the non-Silverlight System.Xml.Linq dll). When I attempt to pass an XElement from GUI project to a method in the Logic project, I am getting (basically) "XElement is not of type XElement" errors…
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Hi, I am using SQL Server 2005 in a project. I have to decide about datalayer. I would like to use LINQ in my project. I saw SubSonic 3 supporting LINQ and I also have option for LINQ to SQL, because i can have typed lists from LINQ to SQL.
I am wondering what is different between LINQ to SQL and…
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The query optimizer does not always choose an optimal strategy when joining partitioned tables. This post looks at an example, showing how a manual rewrite of the query can almost double performance, while reducing the memory grant to almost nothing. Test Data The two tables in this example use…
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Just a small question regarding joins. I have a table with around 30 fields and i was thinking about making a second table to store 10 of those fields. Then i would just join them in with the main data. The 10 fields that i was planning to store in a second table does not get queried directly, it's…
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Just a small question regarding joins. I have a table with around 30 fields and i was thinking about making a second table to store 10 of those fields. Then i would just join them in with the main data. The 10 fields that i was planning to store in a second table does not get queried directly, it's…
>>> More
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Table 1
Field1 Field2
AA 20
AA 20
AB 12
AC 13
Table2
field3 field4
AA 20
AA 20
AC 13
AD 23
AW 21
output required:
newfield field2 field4
AA 20 20
AA 20 20
AC 13 13
I used:
select field1 as newfield, t1.field2,t2.field4
from table1 t1 join table2 t2 on t1.field1=t2.field3
This…
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I have a program to use the IMDB database and am having very slow performance on my query. It appears that it doesn't use my where condition until after it materializes everything. I looked around for hints to use but nothing seems to work. Here is my query:
SELECT *
FROM name as n1
FULL JOIN…
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