Problem With SQL Server Left Outer Join: Help Needed

Nov 1, 2004

I am getting different results with LEFT outer join operator and *= operator. With *= I am getting the expected results. Can anyone look at SQL and tell what I am doing wrong?

SQL with Left Outer join operator:

select CurrentWeekFinMetrics.[Hub+],
WeeklyMetricsFormat.line#,
WeeklyMetricsFormat.MetricsType,
WeeklyMetricsFormat.Metrics,
WeeklyMetricsFormat.Measure, WeeklyMetricsFormat.jobs, case when dataformatchar is not null then
case when IsPrefix = 'Y' then dataformatchar + convert (varchar, CurrentWeekFinMetrics.displayCol )
else convert (varchar, CurrentWeekFinMetrics.displayCol ) + dataformatchar end
else
convert (varchar, CurrentWeekFinMetrics.displayCol )
end
from WeeklyMetricsFormat LEFT JOIN CurrentWeekFinMetrics on (WeeklyMetricsFormat.Line# = CurrentWeekFinMetrics.Line#)
where CurrentWeekFinMetrics.WeekEndingDate = '10/09/04' and CurrentWeekFinMetrics.[Hub+] = 'Amstelveen'
order by CurrentWeekFinMetrics.[Hub+], WeeklyMetricsFormat.Line#


SQL with *= operator
select CurrentWeekFinMetrics.[Hub+],
WeeklyMetricsFormat.line#,
WeeklyMetricsFormat.MetricsType,
WeeklyMetricsFormat.Metrics,
WeeklyMetricsFormat.Measure, WeeklyMetricsFormat.jobs, case when dataformatchar is not null then
case when IsPrefix = 'Y' then dataformatchar + convert (varchar, CurrentWeekFinMetrics.displayCol )
else convert (varchar, CurrentWeekFinMetrics.displayCol ) + dataformatchar end
else
convert (varchar, CurrentWeekFinMetrics.displayCol )
end
from WeeklyMetricsFormat , CurrentWeekFinMetrics
where CurrentWeekFinMetrics.WeekEndingDate = '10/09/04' and CurrentWeekFinMetrics.[Hub+] = 'Amstelveen'
AND (WeeklyMetricsFormat.Line# *= CurrentWeekFinMetrics.Line#)

For Left outer join operator, I am getting 54 rows, *= I am getting 69 rows.

Thanks and Regards
mb

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Left Join Vs Left Outer Join Syntax Generates Different Execution Plans

Apr 16, 2008



Anyone know why using

SELECT *
FROM a LEFT OUTER JOIN b
ON a.id = b.id
instead of

SELECT *
FROM a LEFT JOIN b
ON a.id = b.id

generates a different execution plan?

My query is more complex, but when I change "LEFT OUTER JOIN" to "LEFT JOIN" I get a different execution plan, which is absolutely baffling me! Especially considering everything I know and was able to research essentially said the "OUTER" is implied in "LEFT JOIN".

Any enlightenment is very appreciated.

Thanks

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Apr 15, 2015

I'm attempting to improve a vendor created query.

Here is the original -

SELECT m.lID
FROM Message m
inner join Message_Cc mCC on m.lID=mCC.lMessage and mCC.lOfficeRecipient = 200321
INNER JOIN UserRole d on mCC.szRecipient=d.szRoleName
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[Code] ....

If I run this without the LEFT OUTER JOIN and the is null statement I get 648 rows. But If I include it I get 0 rows. I can't understand why I get 0 rows with the outer join.

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Oct 8, 2015

I was writing a query using both left outer join and inner join.  And the query was ....

SELECT
        S.companyname AS supplier, S.country,P.productid, P.productname, P.unitprice,C.categoryname
FROM
        Production.Suppliers AS S LEFT OUTER JOIN
        (Production.Products AS P
         INNER JOIN Production.Categories AS C

[code]....

However ,the result that i got was correct.But when i did  the same query using the left outer join in both the cases

i.e..

SELECT
        S.companyname AS supplier, S.country,P.productid, P.productname, P.unitprice,C.categoryname
FROM
        Production.Suppliers AS S LEFT OUTER JOIN
(Production.Products AS P
LEFT OUTER JOIN Production.Categories AS C
ON C.categoryid = P.categoryid)
ON
S.supplierid = P.supplierid
WHERE
S.country = N'Japan';

The result i got was same,i.e

supplier     country    productid    productname     unitprice    categorynameSupplier QOVFD     Japan     9     Product AOZBW    97.00     Meat/PoultrySupplier QOVFD    Japan   10     Product YHXGE     31.00     SeafoodSupplier QOVFD     Japan   74     Product BKAZJ    10.00     ProduceSupplier QWUSF     Japan    13     Product POXFU     6.00     SeafoodSupplier QWUSF     Japan     14     Product PWCJB     23.25     ProduceSupplier QWUSF    Japan     15    Product KSZOI     15.50    CondimentsSupplier XYZ     Japan     NULL     NULL     NULL     NULLSupplier XYZ     Japan     NULL     NULL     NULL     NULL

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Scenario:

OLEDB source 1
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...
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OLEDB source 2
SELECT ...
,[Bo Tkt Num] <-- this column set to sort order = 1
...
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These two tasks are followed immediately by a MERGE JOIN

All columns in source1 are ticked, all column in source2 are ticked, join key is shown above.
join type is left outer join (source 1 -> source 2)

result of source1 (..dcd column)
...
4-400-8000119
4-400-8000120
4-400-8000121
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4-400-8000123
4-400-8000124
...


result of source2 (..tkt num column)
...
4-400-1000118
4-400-1000119
4-400-1000120
4-400-1000121
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4-400-1000123
4-400-1000124
4-400-1000125
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Jan 7, 2002

Hello!
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But I need one condition in this query:only records from customer table where cus_type in ("A","B","C").
I don't need all other types ("D","E").

So my query looks like this:

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Bingo 47 lone oak C NULL
Sears 1020 Magic dr. B exist


But my query pulls records for customers with type "D" and "E" that I'm trying to exclude from result.


Please help.
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Hi,

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P

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Hi All,

Greetings! I have a problem converting *= to LEFT OUTER JOIN.
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Thank you,
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Hello !
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I am trying to write a query which essentially gives the amount of stock available for a particular stock_code.

select Stock_code, description from stock

Now what i want to do is, for each one of the stock_code that apears in the table above i want to look into another table called pop_item, and get the closest delivery_date for that particular stock_code. So i have top 1 and order it by delivery_date desc.

Individually for a particular stock_code, i can do this no problem. And here is my code for stock_code='E0016/6'

select top 1
stock_code, delivery_date, order_number,qty_order-qty_delivered as onorder
from pop_item
where
stock_code='E0016/6' and
qty_order>qty_delivered
order by delivery_date desc

But I can't seem to be able to do this for all the stock_code, and not a specific one, cause even though i try and left outer join it, i can't access the outer stock_code from the first query into the next...

i.e

select stock.Stock_code, description, tempp.stock_code, tempp.delivery_date, tempp.onorder from stock

left outer join

(select top 1
stock_code, delivery_date, order_number,qty_order-qty_delivered as onorder
from pop_item
where

--Can't say this(stock_code= stock.stock_code and )
qty_order>qty_delivered
order by delivery_date desc) as tempp

on tempp.stock_code=stock.stock_code

Now my question is, is there anyway to access stock.stock_code within the second query? Casue the whole query on top returns only one value for delivery_date, only of the highest delivery date in the whole of pop_item. which make sense... but i don;t know how to get around this...

OOOOOOOOOOOOOOOOOOhhhhhhhhhhhhhhhhhhhhhhhhhhhhh!

Hope someone can help me.

Regards,

Munira

ps- should i be using a cursor, can i call cursors from asp.net. every where i read about cursors they adivice us not to use them.

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Sub-select Vs. LEFT OUTER JOIN

May 11, 2007

I think it is quite often when you need to view some records, which refer (by key) to data in other tables. For instance, a user belongs to a group but it is preferable to show group name in the user data rather than group id. The options are

1) LEFT OUTER JOIN:
SELECT users.id, groups.name FROM users LEFT OUTER JOIN groups ON users.[group] = groups.id

2) A Subselect:
SELECT id, [group] = (SELECT [name] FROM groups WHERE id = users.[group]) FROM users

Which is better and why?

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