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Sep 18th, 2012, 09:22 AM
#1
Thread Starter
Hyperactive Member
Join or Union?
I have two tables:
Table 1:
Code,No1
A, 1
C, 2
E, 3
Table 2:
Code, No2
A, 2
B, 4
D, 6
I want to join these two tables to give;
Code,No1,No2
A, 1, 2
B, 0, 4
C, 2, 0
D, 0, 6
E, 3, 0
I have been trying varius JOINS & UNION but I cannot find the solution - any suggestions.
Thanks.
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Sep 18th, 2012, 09:35 AM
#2
Re: Join or Union?
Looks like a Full Outer to me:-
Select isnull(table1.No1), isnull(table2.No2)
From Table1
Full Outer Join Table2
on Table1.Code = Table2.Code
edit> If you Joined a Union would it have to be a Left Join?
Last edited by FunkyDexter; Sep 18th, 2012 at 09:37 AM.
Reason: Never could resist a quip
The best argument against democracy is a five minute conversation with the average voter - Winston Churchill
Hadoop actually sounds more like the way they greet each other in Yorkshire - Inferrd
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Sep 18th, 2012, 10:11 AM
#3
Thread Starter
Hyperactive Member
Re: Join or Union?
That's neary what I want, it's not giving the code
No1,No2
1, 2
0, 4
2, 0
0, 6
3, 0
I tried adding it to the SELECT satement but it leaves blanks.
Select table1.code, isnull(table1.No1), isnull(table2.No2)
From Table1
Full Outer Join Table2
on Table1.Code = Table2.Code
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Sep 18th, 2012, 12:21 PM
#4
Re: Join or Union?
Worked with Access
Code:
SELECT table4.Code, table4.No1, iif(isnull(table2.No2),0,table2.No2) As No2 From
(SELECT DISTINCT(table3.Code), IIf(IsNull(table1.No1),0,table1.No1) AS No1
FROM (Select * From table1
UNION
Select * from table2) AS table3 LEFT JOIN table1 ON table3.code = table1.code) As table4
left join table2 on table4.code=table2.code
Last edited by Zvoni; Tomorrow at 31:69 PM.
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One IDE to bring them all, and to the Framework bind them,
in the Land of Redmond, where the Windows lie
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Sep 19th, 2012, 03:22 AM
#5
Re: Join or Union?
Ah, sorry, I overlooked the code.
It will leave it blank for records that aren't in Table1 because you're reading it from Table1 and, well, it isn't there. What you want to do is read ot from Table1 if it's there and Table2 if its not, either:-
ISULL(Table1.Code, Table2.Code)
Or:-
Coalesce(Table1.Code, Table2.Code)
The best argument against democracy is a five minute conversation with the average voter - Winston Churchill
Hadoop actually sounds more like the way they greet each other in Yorkshire - Inferrd
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Sep 20th, 2012, 02:09 AM
#6
Thread Starter
Hyperactive Member
Re: Join or Union?
Thanks, I hadn't thought of using isnull that way.
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