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 Joining three tables		  New Topic  Reply to Topic
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amurark
Yak Posting Veteran

India
50 Posts
Posted - 12/08/2012 :  00:30:50  Show Profile  Reply with Quote
pls help me
suppose there are threee tables A,B and C.
A has some records which are avalble in B table and B has some records which have in C table. But A and C dont have any connection.

How tojoin A, B and C.

For eg
one record of A -->1000256 is in B
B table have both--> 1000256, 1000930

one record of C --> 1000930 is in B


how to join three tables ?



Pls help me



Ankita

chadmat
The Chadinator

USA
1961 Posts
Posted - 12/08/2012 :  01:52:01  Show Profile  Visit chadmat's Homepage  Reply with Quote
SELECT * FROM
A JOIN B on A.id1 = b.id1
JOIN C ON B.id2 = C.id2

-Chad
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amurark
Yak Posting Veteran

India
50 Posts
Posted - 12/08/2012 :  02:28:54  Show Profile  Reply with Quote
thanks for your reply but it didn't returned any rows.

SELECT A.element_id,A.sample_timestamp,B.SYS_NAME,B.ALIAS, C.BITSIN,
A.CPUUTILIZATION,A.MemoryUTilization FROM
NHV_ST_B_104022 A JOIN NHV_ELEMENT_FOR_USER B
on A.element_id= b.element_id
JOIN NHV_ST_B_104050 C ON B.element_id = C.element_id

Ankita
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sunitabeck
Flowing Fount of Yak Knowledge

5152 Posts
Posted - 12/08/2012 :  08:30:25  Show Profile  Reply with Quote
In the example you posted, what is the output that you are expecting? You can change the joins to FULL JOIN and see if that meets your requirements:
SELECT * FROM 
A FULL JOIN B on A.id1 = b.id1
FULL JOIN C ON B.id1 = C.id1
If that is not it, please post sample input data long with the required output.
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