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ruchi.jain
New User
Joined: 17 Sep 2007
Posts: 17
Location: Pune
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Hi All,
I want to retrieve data from 7 different tables. There is no condition we have to retrieve all the tables data.
It might be like that the user1 is in table1 but its not there in table2; but then also in our report we want that user.
I tried using UNION keyword but the limitation with UNION is that if we are retrieving 3 columns from table1 than from table2 we have to retrieve 3 columns only.
Can we use other function or keyword so that if the column numbers are mismatch then also we will able to get the data.
One more question, I tried with SPUFI but it is showing row limit exceeded. Apart from SPUFI/QMF how can i retrieve the data.
Appreciate your help. |
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Ketan Varhade
Active User
Joined: 29 Jun 2009
Posts: 197
Location: Mumbai
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HI Ruchi,
Please could you explain that on what basis that you want to the data for all the 7 table, is there any connection between the 7 tables, some key ?
Can you give us a example that how should be a desired output look like.
Have you tried using joins? |
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ruchi.jain
New User
Joined: 17 Sep 2007
Posts: 17
Location: Pune
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Hi Ketan,
There is no condition; we want to retrieve the data from all tables. One thing is that 5 tables have 1 column in common: Racfid is the column name.
Other 3 tables are not having this column but they are inter-related between them.
But i want the data like:
Table1 has 3 columns... table2 has 2 columns... table3 has 4 columns.... and so on...
if 1 user is in table1 but not in table2 then also i want the user1 in the report.
The report will contain all the columns name and if user detail is not there in particular column then it will give null value. |
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enrico-sorichetti
Superior Member
Joined: 14 Mar 2007
Posts: 10873
Location: italy
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it would be wise to try to understand better the requirement...
from the confusing info provided the quick and dirty answer would be..
run as many queries as the tables You have
also get proper math training...
in the topic title You say 10 tables
in the topic text You say 7
afterward You contradict Yourself again by saying 5 and 3
sloppyness will not make people eager to help You
to get good help You need to post clearly what You have to do, |
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ruchi.jain
New User
Joined: 17 Sep 2007
Posts: 17
Location: Pune
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Hi,
Actually i want data of 10 tables only but i was just giving an example. Ketan asked are there any key column in all the tables so i am giving an example that if there are 8 tables then 5 are having 1 common column and other 3 are inter-related to them.
I am sorry if that misguide you but i really want to fetch data from 10 tables and out of them 7 are having 1 column common and other 3 are inter-related but with other column.
I want to give the data in 1 report only so running as much query as tables is not the feasible method.
I hope now you got the correct statistics.
Please help. |
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GuyC
Senior Member
Joined: 11 Aug 2009
Posts: 1281
Location: Belgium
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there are a few ways of full outer joining > 3 tables :
Basic : Nested outer join :
| Code: |
Select * from
( Select first2.* ,c.*, coalesce(first2.K1, c.col1) as K1
from
(Select a.*,b.*, coalesce(a.col1,b.col1) as K1
from table1 a
full outer join table2 b on a.col1 = b.col1) as first2
full outer join table3 c on c.col1 = first2.K1) as first3
full outer join table4 d on d.col1 = first3.K1 |
Easier : all in one
| Code: |
select *
from table1 a
full outer join table2 b on b.col1 = a.col1
full outer join table3 c on c.col1 = coalesce (a.col1,b.col1)
full outer join table4 d on d.col1 = coalesce (a.col1,b.col1,c.col1)
full outer join table5 e on e.col1 = coalesce (a.col1,b.col1,c.col1,d.col1) |
If outer joining with different columns = combination of the above
suppose :
first 5 table outer join on col1
sixth table outer join on col2 which is also on table1,table3 and table5
| Code: |
select * from (
select a.*,b.*,c.*,d.*,e.*, coalesce (a.col2,c.col2,e.col2) as K2
from table1 a
full outer join table2 b on b.col1 = a.col1
full outer join table3 c on c.col1 = coalesce (a.col1,b.col1)
full outer join table4 d on d.col1 = coalesce (a.col1,b.col1,c.col1)
full outer join table5 e on e.col1 = coalesce (a.col1,b.col1,c.col1,d.col1)
) First5
full outer join table6 F on f.col2 = First5.K2 |
with very doubtfull results if a.col2 <> c.col2
PS.: you must understand that outer joining > 3 tables is not very performant, because for each 2 tables he must build an intermediate result |
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sushanth bobby
Senior Member
Joined: 29 Jul 2008
Posts: 1020
Location: India
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Hi Ruchi,
Can you give us you sample data and the expected report output along with the query you have tried. It would be a lot helpfull.
| Code: |
| Try to use CODE tags while posting your sample data. |
Thank You,
Sushanth |
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sushanth bobby
Senior Member
Joined: 29 Jul 2008
Posts: 1020
Location: India
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Ha, i should have refreshed my page before posting.
Sushanth |
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dick scherrer
Moderator Emeritus
Joined: 23 Nov 2006
Posts: 19244
Location: Inside the Matrix
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Hello,
If there is a large volume of data to be processed, you might consider unloading all of the data in some common format and doing what you need using the extracted data.
Running high volumes of data thru some poorly performing "query(ies)" will only waste system resources. . . |
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