left join in multiple tables

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Table 1:

SQL

Table 2:

SQL

id   amount
1    100
1    100
2    200
3    300
4    null

Table 3:

SQL

id amount
1   null
2   200
2   200
3   300
3   200
4   null

id is common for each tables , how can i get output like this:

SQL

id  t1   t2   t3
1  100  200  null
2  200  200   400
3  300  300   500
4  400  null null

i am stuck with this .

Posted 7-Dec-13 0:37am

King Fisher

Updated 7-Dec-13 18:46pm

Amir Mahfoozi

v6

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idle63 · Answer 1 · 2013-12-07T00:59:00

Solution 1

SQL

SELECT 
  TBL1.AMOUNT T1,  
  TBL2.AMOUNT T2,  
  TBL3.AMOUNT T3
FROM TBL1
LEFT JOIN TBL2 ON TBL2.ID = TBL1.ID
LEFT JOIN TBL3 ON TBL3.ID = TBL1.ID

Now after improving the question by OP, this solution is of course not the solution.

Posted 7-Dec-13 0:59am

idle63

Updated 7-Dec-13 21:13pm

v5

Comments

King Fisher 7-Dec-13 7:05am

thanks,
i used this ,but im getting id which is repeats more than one time

[no name] 7-Dec-13 7:52am

But that means TBL1 (or one of the other two tables) contains the same ID more then one time.

In case all the tables contain ID unique, I'm pretty sure the select statement above is right.

So the question is what will you do if ID is not unique. Do you like then to have the respective sum of the amounts?

King Fisher 7-Dec-13 8:17am

yes .your right.

i used this

SELECT
TBL1.ID,
sum(TBL1.AMOUNT T1),
sum(TBL2.AMOUNT T2),
sum(TBL3.AMOUNT T3)
FROM TBL1
LEFT JOIN TBL2 ON TBL2.ID = TBL1.ID
LEFT JOIN TBL3 ON TBL3.ID = TBL1.ID group by id

i got the unique id 1,2,3,4 , but the amount is not respective to the id

[no name] 7-Dec-13 8:44am

You improved the question. Are you sure the result table is correct? E.g. is it not like this that T3 for ID==2 should be 400?

Amir Mahfoozi · Answer 2 · 2013-12-07T18:46:00

This will give you what you want. But I supposed that table1 has all the Ids.

SQL

select id,  (select sum(amount) from table1 st1 where st1.id=tbl1.id) t1,
            (select sum(amount) from table2 st2 where st2.id=tbl1.id) t2,
            (select sum(amount) from table3 st3 where st3.id=tbl1.id) t3
from table1 tbl1

Good Luck