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Query needed...

 
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Rohit Umarjikar

Senior Member


Joined: 21 Sep 2010
Posts: 1806
Location: NY,USA

PostPosted: Wed Jan 16, 2013 6:30 am    Post subject: Query needed...
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Hello Team,

I have below two tables,

A
Code:

DepNo
---------------
12345
12346
12347



B
Code:


DepNo            flag
---------------  -------
12345              H
12345              H
12345              S
12345              I
12347              I
12347              S


I would like to output as,

output
Code:

DepNo           Flag
--------------  -------
12345            H
12346            N
12347            S


Here below rules are places,
1)All the DepNo from table A should come
2)If the DepNo from A is not present in table B then flag should be marked as 'N'
3)if DeptNo is present multiple times in table B (for e.g. 12345 ) then out of I,S,H only H should be picked up also if only S,I is present(for e.g. 12347) then 'S' should be picked up and if any 'I' is present then only 'I' should be picked up.

Appreciate your suggestion.
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Srihari Gonugunta

Active User


Joined: 14 Sep 2007
Posts: 295
Location: Singapore

PostPosted: Wed Jan 16, 2013 1:04 pm    Post subject:
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Rohit,
You may try this.

Code:
select distinct t1.depno,
case
when locate('H',t1.flag)<>0 then 'H'
when locate('S',t1.flag)<>0 then 'S'
when locate('I',t1.flag)<>0 then 'I'
else 'N'end as flag
from (select distinct a.depno,coalesce(b.flag,'N')||coalesce(c.flag,'N')||coalesce(d.flag,'N') as flag from table1 a
left outer join table2 b on a.depno = b.depno and b.flag = 'H'
left outer join table2 c on a.depno = c.depno and c.flag = 'S'
left outer join table2 d on a.depno = d.depno and d.flag = 'I') t1;
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GuyC

Senior Member


Joined: 11 Aug 2009
Posts: 1281
Location: Belgium

PostPosted: Wed Jan 16, 2013 7:32 pm    Post subject:
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Code:
select A.deptno,
 coalesce(substr(min(digits(locate(b.flag,'HSI'))||b.flag),11),'N')
from      TableA A
left join TableB B on a.deptno = b.deptno
group by a.deptno
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Rohit Umarjikar

Senior Member


Joined: 21 Sep 2010
Posts: 1806
Location: NY,USA

PostPosted: Wed Jan 16, 2013 9:57 pm    Post subject:
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Thanks Srihari.
GuyC, it is working as expected. Thank you.
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