Help required for Join Query in MSSQL

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SQL-Server-2008R2

SQL

SELECT     SampleRegistration.SampleNumber
FROM         SampleRegistration INNER JOIN
                      NewSampleEntrys ON SampleRegistration.QlCode = NewSampleEntrys.QLID INNER JOIN
                      Protocol ON SampleRegistration.SampleNumber = Protocol.SampleNumber
WHERE     (NewSampleEntrys.RecvdDate > '1/1/2013') AND (SampleRegistration.Tested = 'F')

In above Query i want all matching record from NewSampleEntrys & SampleRegistration and skip all record in Protocol table.

what changes should i made plz help.

Posted 5-Sep-14 2:43am

Nikhil Bhivgade

Updated 5-Sep-14 3:22am

Herman<T>.Instance

v2

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4 solutions

Solution 1

If you want to skip records in Protocol that do not have a match in SampleRegistration, you should use a LEFT JOIN:

SQL

SELECT       SampleRegistration.SampleNumber
FROM         SampleRegistration 
INNER JOIN   NewSampleEntrys ON SampleRegistration.QlCode = NewSampleEntrys.QLID 
LEFT JOIN    Protocol ON SampleRegistration.SampleNumber = Protocol.SampleNumber
WHERE        (NewSampleEntrys.RecvdDate > '1/1/2013') 
AND          (SampleRegistration.Tested = 'F')

Posted 5-Sep-14 2:52am

kbrandwijk

Comments

Nikhil Bhivgade 5-Sep-14 8:59am

i think i am not able to put my question properly.

if samplenumber is present in protocal table it should not been displayed in result

Solution 4

Hi Nikhil,
Please check this

SQL

SELECT  SampleRegistration.SampleNumber
FROM    SampleRegistration
INNER JOIN NewSampleEntrys ON SampleRegistration.QlCode = NewSampleEntrys.QLID
Where SampleRegistration.SampleNumber not in (Select SampleNumber from Protocol)
and (NewSampleEntrys.RecvdDate > '1/1/2013') AND (SampleRegistration.Tested = 'F')

It may help for you, good luck,

Posted 5-Sep-14 7:14am

Manikandan MAC

Comments

kbrandwijk 5-Sep-14 17:29pm

How is this different from Solution 2?

Manikandan MAC 6-Sep-14 2:10am

Hi, I am sorry, I didn't see solution 2, both are same.

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Gupta Poonam · Accepted Answer · 2014-09-05T03:19:00

You can try using NOT IN operator..

SQL

SELECT     SampleRegistration.SampleNumber
FROM         SampleRegistration INNER JOIN
                      NewSampleEntrys ON SampleRegistration.QlCode = NewSampleEntrys.QLID
WHERE     (NewSampleEntrys.RecvdDate > '1/1/2013') AND (SampleRegistration.Tested = 'F') AND SampleRegistration.SampleNumber Not IN (SELECT SampleNumber From Protocol)

kbrandwijk · Accepted Answer · 2014-09-05T03:32:00

Solution 2 works, but is slow. See http://www.componentworkshop.com/blog/2009/06/26/sql-server-basics-avoiding-in-and-not-in[^] for more information on why you don't want queries with IN or NOT IN. You can keep your original join, but add a condition that no record in Protocol was found by checking for null values:

SQL

SELECT       SampleRegistration.SampleNumber
FROM         SampleRegistration
INNER JOIN   NewSampleEntrys ON SampleRegistration.QlCode = NewSampleEntrys.QLID
LEFT JOIN    Protocol ON SampleRegistration.SampleNumber = Protocol.SampleNumber
WHERE        (NewSampleEntrys.RecvdDate > '1/1/2013')
AND          (SampleRegistration.Tested = 'F')
AND          (Protocol.Id IS NULL)

Assuming Id is an existing Id column in the Protocol table. If it's named differently, please update the condition to reflect this.