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Using extension syntax I'm trying to create a left-join using LINQ on two lists that I have. The following is from the Microsoft help but I've modified it to show that the pets list has no elements. What I'm ending up with is a list of 0 elements. I assume...
Started by Guy on
, 6 posts
by 6 people.
Answer Snippets (Read the full thread at stackoverflow):
I don't have the exact syntax in context.People join pet in context.Pets on person = pet.Owner into tempPets from pets; pets = new List<Pet>{barley}; var results....
Left joins in LINQ are possible with the DefaultIfEmpty() method.
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I have generated the following sql query code in access using the Qbe and converting it to sql.However, i want proof that i did without help so i intend to take out all inner join statements and replace them with the WHERE statement. How do i work it ...
Started by Selase on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
Each INNER JOIN can be mechanically transformed into a WHERE ....
It's a strange thing to want to do (as commenters say, INNER JOIN is usually better, and applying a mechanical transformation proves nothing), but not difficult.
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Is there a difference in performance (in oracle) between
Select * from Table1 T1 Inner Join Table2 T2 On T1.ID = T2.ID
And
Select * from Table1 T1, Table2 T2 Where T1.ID = T2.ID
?
Started by Juan Manuel Formoso on
, 15 posts
by 15 people.
Answer Snippets (Read the full thread at stackoverflow):
Hopefully ( id INT, name....
The SQL Server version of the old style left join is flawed even in SQL Server 2000 and gives inconsistent results (sometimes a left join sometimes a cross join), so it should never be used.
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Ask your Facebook Friends
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Both these joins will give me the same results:
SELECT * FROM table JOIN otherTable ON table.ID = otherTable.FK
vs
SELECT * FROM table INNER JOIN otherTable ON table.ID = otherTable.FK
Is there any difference between the statements in performance or otherwise...
Started by driis on
, 6 posts
by 6 people.
Answer Snippets (Read the full thread at stackoverflow):
LEFT....
OUTER JOIN and never LEFT JOIN, but I never use INNER JOIN but rather I just use "JOIN"
SELECT ColA JOIN can be a bit more clear to read, especially if your query has other join types (e.g.
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Provided that the tables could essentially be inner joined, since the where clause excludes all records that don't match, just exactly how bad is it to use the first of the following 2 query statement syntax styles:
SELECT {COLUMN LIST} FROM TABLE1 t1...
Started by Joshua on
, 5 posts
by 5 people.
Answer Snippets (Read the full thread at stackoverflow):
The first query doesn't produce a full OUTER join (which is the union of both LEFT and RIGHT that is 17 years out of date for goodness sakes!
Further, the left and right join syntax in the old syntaxhttp://stackoverflow....
A role.
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Duplicate of: What’s the difference between just using multiple froms and joins?
Most SQL dialects accept both the following queries:
SELECT a.foo, b.foo FROM a, b WHERE a.x = b.x SELECT a.foo, b.foo FROM a LEFT JOIN b ON a.x = b.x
Now obviously when ...
Started by jmucchiello on
, 11 posts
by 11 people.
Answer Snippets (Read the full thread at stackoverflow):
FROM Company LEFT JOIN ( Department INNER JOIN Employee ON Department.ID = Employee.DepartmentID, but with the new syntax, you can do this:
SELECT * FROM Company LEFT JOIN ( Department INNER JOIN....
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I much prefer to code in t-sql using what is in effect an in-line join, rather than have a long list of the joins at the end of the stored procedure or view.
For example, I code:
SELECT PKey , Billable, (SELECT LastName FROM Contact.dbo.Contacts WHERE...
Started by Lill Lansey on
, 9 posts
by 9 people.
Answer Snippets (Read the full thread at stackoverflow):
Generally speaking sub-queries (ie first example) are slower server provides excellent analysis and performance... .
The first one (subqueries) does 3 queries) to a left outer join.
The second one (the actual inner join), generally.
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What is the main purpose of using CROSS APPLY ?
I have read (vaguely, through posts on the Internet) that cross apply can be more performant when selecting over large data sets if you are partitioning. (Paging comes to mind)
I also know that CROSS APPLY...
Started by Jeff Meatball Yang on
, 6 posts
by 6 people.
Answer Snippets (Read the full thread at stackoverflow):
CROSS APPLY CROSS APPLY works better on things a difference in those cases where INNER JOIN will work as well?
See the article article in my blog BY t2.rank DESC )....
For detailed performance comparison:
INNER JOIN vs.
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I find myself unwilling to push to using JOIN when I can easily solve the same problem by using an inner query:
e.g.
SELECT COLUMN1, ( SELECT COLUMN1 FROM TABLE2 WHERE TABLE2.ID = TABLE1.TABLE2ID ) AS COLUMN2 FROM TABLE1;
My question is, is this a bad...
Started by Nissan Fan on
, 9 posts
by 9 people.
Answer Snippets (Read the full thread at stackoverflow):
In MySQL , however, there are some cases when an aggregate function... .
You use was often used as a replacement for a LEFT JOIN for the engines that lacked it (most notably supports LEFT JOIN , use the LEFT JOIN .
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On Thu, 3 Jul 2008 10:28:35 -0700 (PDT), shapper <mdmoura@gmail.com
Hello,
I am used to SQL but I am starting to use LINQ.
How can I create Left, Right and Inner joins in LINQ? How to
distinguish the different joins?
Here is a great SQL example...
Started by shapper on
, 20 posts
by 5 people.
Answer Snippets (Read the full thread at omgili):
Select distinct c.* from customers c inner join orders o
on c.Customerid with the
join statement, to prevent row exclusion in some edge queries
(combinations of inner and left....
C.CustomerId = o.Customerid
vs.
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