Additional Criteria In LEFT JOIN

Jan 18, 2008

I have a stored procedure which is used to search records in the database based on the data sent from the web page. There are several search fields and all of them are in one table (Table1) except the "CallerName" field which is in a different table (Table2). Since I had to show CallerName also in the gridview apart from other columns, I did a LEFT JOIN (using field CallerNumber) to show all the required fields from Table1 and CallerName from Table2.

Now heres the problem. Since CallerName is a search criteria, its supposed to be in the WHERE clause after the JOIN or in the JOIN clause itself. The problem is, if I put it in WHERE clause, the result set doesn't show records from Table1 which do not have a matching CallerNumber in Table2. SELECT T1.CallerNumber, T1.DateCalled, T2.CallerName
FROM Table1 T1
LEFT JOIN Table2 T2 on
T1.CallerNumber = T2.CallerNumber
WHERE T1.CallerNumber = 'some number' AND T2.CallerName = 'some name' If I put it in the JOIN condition, it works just like a LEFT JOIN is supposed to work, showing all the records in Table1 and also those which had CallerName in Table2. SELECT T1.CallerNumber, T1.DateCalled, T2.CallerName
FROM Table1 T1
LEFT JOIN Table2 T2 on
T1.CallerNumber = T2.CallerNumber AND T2.CallerName = 'some name'
WHERE T1.CallerNumber = 'some number'



1st SQL won't work for me because it doesn't show all the records in Table1, even when no search criteria is specified.
2nd SQL won't work for me because it shows more than required when just CallerName is sent from the web page as search criteria. It will show all the records where CallerName is "some name" and also all the additional records (since it is a left join).

Can I get the goodness of both in one or do I have to create two separate Stored Procedures?

Thanks all,
Bullpit

 

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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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May 24, 2004

For example, consider the following queries:


DECLARE @SomeParam INT
SET @SomeParam = 44

SELECT *
FROM TableA A
JOIN TableB B ON A.PrimaryKeyID = B.ForeignKeyID
WHERE B.SomeParamColumn = @SomeParam

SELECT *
FROM TableA A
JOIN TableB B ON A.PrimaryKeyID = B.ForeignKeyID AND B.SomeParamColumn = @SomeParam


Both of these queries return the same result set, but the first query filters the results in the WHERE clause whereas the the second query filters the results in the JOIN criteria. Once upon a time a DBA told me that I should always use the syntax of the first query (WHERE clause). Is there any truth to this, and if so, why?

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Apr 7, 2008

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May 14, 2008

Hi,

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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
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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

and this time also i got the same result.My question is that is there any specific reason to use inner join when join the third table and not the left outer join.

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Aug 10, 2007

Scenario:

OLEDB source 1
SELECT ...
,[MANUAL DCD ID] <-- this column set to sort order = 1
...
FROM [dbo].[XLSDCI] ORDER BY [MANUAL DCD ID] ASC


OLEDB source 2
SELECT ...
,[Bo Tkt Num] <-- this column set to sort order = 1
...
FROM ....[dbo].[FFFenics] ORDER BY [Bo Tkt Num] ASC

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
4-400-1000122 <--row not joining
4-400-1000123
4-400-1000124
4-400-1000125
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Aug 9, 2013

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I have this statement:

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P.SuffixID,
A.Linenumber1,
A.LineNumber2,
Z.City,

[code]....

Seems like no matter which join type I choose i still get duplicates.

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Sep 28, 2015

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inner join EmpB on EmpA.email = EmpB.email
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I now want to modify the above where I want to output rows such that

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Feb 5, 2015

Why does this right join return the same results as using a left (or even a full join)?There are 470 records in Account, and there are 1611 records in Contact. But any join returns 793 records.

select Contact.firstname, Contact.lastname, Account.[Account Name]
from Contact
right join Account
on Contact.[Account Name] = Account.[Account Name]
where Contact.[Account Name] = Account.[Account Name]

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Aug 17, 2007

Hi guys,

I'll appreciate any help with the following problem:

I need to retrieve data from 3 tables. 2 master tables and 1 transaction table.

1. Master table TBLOC contain 2 records :
rcd 1. S01
rcd 2. S02

2. Master table TBCODE contain 5 records:

rcd 1. C1
rcd 2. C2
rcd 3. C3
rcd 4. C4
rcd 5. C5

3. Transaction table TBITEM contain 4 records which link to 2 master table:
rcd 1. S01, C1, CAR

rcd 2. S01, C4, TOY
rcd 3. S01, C5, KEY
rcd 4. S02, C2, CAR



I use Left Join & Right Join to retrieve result below (using non-ASNI method) but it doesn't work.

Right Join method:


SELECT C.LOC, B.CODE, A.ITEM FROM TBITEM A RIGHT JOIN TBCODE B ON A.CODE = B.CODE

RIGHT JOIN TBLOC C ON A.LOC = C.LOC

GROUP BY C.LOC, B.CODE, A.ITEM ORDER BY C.LOC, B.CODE



When I use Non-ASNI method it work:



SELECT C.LOC, B.CODE, A.ITEM FROM TBITEM A, TBCODE B, TBLOC C

WHERE A.CODE =* B.CODE AND A.LOC =* C.LOC

GROUP BY C.LOC, B.CODE, A.ITEM ORDER BY C.LOC, B.CODE

Result:

LOC CODE ITEM
-----------------------------
S01 C1 NULL
S01 C2 NULL
S01 C3 CAR
S01 C4 TOY
S01 C5 KEY
S02 C1 NULL
S02 C2 CAR
S02 C3 NULL
S02 C4 NULL
S02 C5 NULL


Please Help.

Thanks.






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INSERT @LeftTable (LeftValue)
VALUES (111)
INSERT @LeftTable (LeftValue)
VALUES (222)

[code]....

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I have two tables a and b, where I want to add columns from b to a with a criteria. The columns will be added by month criteria. There is a column in b table called stat_month which ranges from 1 (Jan) to 12 (Dec). I want to keep all the records in a, and join columns from b for each month. I do not want to loose any row from a if there is no data for that row in b.

Here is table a:

naics ust_code port all_qty_1_yr all_qty_2_yr all_val_yr all_air_val_yr all_air_wgt_yr all_ves_val_yr all_ves_wgt_yr all_cnt_val_yr all_cnt_wgt_yr all_border_val_yr
11111000 2010 2002 8070569.14298579 0 2335641254.30021 0 0 2335641254.30021 8156408492.66667 0 0 0
11111000 2230 2010 280841.478063446 0 84622385.9133129 0 0 84622385.9133129 299600780.773355 0 0 0
11111000 2410 1401 25735 0 12305667 0 0 12305667 25719794 0 0 0

[Code] ....

and here is table b:

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11111000 1220 0106 01 2 0 3440 0 0 0
11111000 1220 0107 03 14 0 3442 0 0 0
11111000 1220 0108 09 0 0 0 0 0 0

[Code] ....

I do not know how to have the multiple joins for 12 different months and what join I have to use. I used left join but still I am loosing not all but few rows in a, I would also like to know how in one script I can columns separately from stat_mont =’01’ to stat_month =’12’

/****** Script for SelectTopNRows command from SSMS ******/
SELECT a.[naics]
,a.[ust_code]
,a.[port]
,a.[all_qty_1_yr]
,a.[all_qty_2_yr]

[Code] ....

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komorka

09
10
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II-P
III-P
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SI/3


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Code:

Code:

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