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# Conditional Group by

Posted on 2010-09-19
838 Views
Hello
i have a a table mytable has a data as follows
---------------------------------------------------------------------------------------
ACC_no        | Tr_Date                    | Doc_No             | Doc_TY   line_No     | AMT
-----------------------------------------------------------------------------------------
12272              01-09-2010               12                           01         05              100
12272              05-09-2010               12                           01         06                20
12272              06-09-2010               12                           04         01              150
12272              07-09-2010               12                           02         01                  5
12272              07-09-2010               12                           04         01               110
12272              07-09-2010               12                           02         17                  90

What i need is to group by with a condition "When Doc_Ty =01 >>>> then group Doc_TY, When Doc_ty='04' >>>> then group by TR_DT , otherwise DONT GROUP)
0
Question by:ali_alannah
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LVL 19

Expert Comment

ID: 33711991
hi..

apart from grouping column, other columns are going 2 aggregate function?

else all columns will going to come in group by.

you can achieve it by

select columnlist
from table
group by case Doc_Ty when '01' then Doc_TY else when '04' then TR_DT end
0

LVL 19

Expert Comment

ID: 33712004

sory sory.....

my query is wrong.

how can u do conditional grouping when same result set having both values
0

LVL 3

Expert Comment

ID: 33712076
You can create a table to receive the result sets of 3 different queries, those being filtered using a WHERE clause for your 3 grouping types, something like:

select
ACC_no,
Tr_Date,
Doc_No,
Doc_TY,
min(line_No),
sum(AMT)
into #t_mytable
from mytable
where Doc_Ty='01'
group by
ACC_no,
Tr_Date,
Doc_No,
Doc_TY

insert into #t_mytable
select
ACC_no,
Tr_Date,
min(Doc_No),
min(Doc_TY),
min(line_No),
sum(AMT)
from mytable
where Doc_ty='04'
group by
ACC_no,
Tr_Date

insert into #t_mytable
select
ACC_no,
Tr_Date,
Doc_No,
Doc_TY,
line_No,
AMT
from mytable
where Doc_ty not in ('01','04')

select * from #t_mytable

drop table #t_mytable

Good luck,
DdN
0

Expert Comment

ID: 33712144
i think this would help this is a solution of a problem if bc_smtrtype is K1 AND A ACCNO NUMBER HAS OCCURED 1 THEN ONLY IT SHOULD BE COUNTED.

Select *

From (Select Bc_Sconn_Id,

Bc_Saccno,

Count(*) All_Mtr,

Count(Case

When bc_smtrtype = 'K1' Then

1

End) K1_Mtr

Where Bc_Sconn_Id In (Select Bc_Sconn_Id

Where bc_smtrtype = 'K1')

And bc_izone In (43, 44)

And bc_strf in

('T39', 'T40', 'T41', 'T42', 'T43', 'T44', 'T66', 'T67')

Group By Bc_Sconn_Id, Bc_Saccno)

Where All_Mtr = 1 And K1_Mtr = 1
0

LVL 50

Accepted Solution

ID: 33712560
you basically write the 3 separate queries for each situation and use UNION (ALL) to join them into one result set.select ACC_no ,Tr_Date ,Doc_No , Doc_TY ,  line_No , AMT from mytable  where Doc_ty not in (''01' .'04')Union  select ACC_no ,Max(Tr_Date) ,max(Doc_No) , '01' , max( line_No) ,sum( AMT) from mytable  where Doc_ty = ''01'  group by Acc_noUnion  select ACC_no ,Tr_Date ,max(Doc_No) , '04' , max( line_No) ,sum( AMT) from mytable  where Doc_ty = ''04'  group by Acc_no,tr_dateOrder by Acc_no,tr_date
0

Author Closing Comment

ID: 33714401
Perfect
0

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