I am having issue in group by using decode and case in pl/sql

Question

my query is some thing like this but having more column in select. when i am firing this query it is giving result but that is not proper
my problem is , like if there are 3 more values for uh.sflowtype (0,1,2) then group by is not working for them and those are coming in different row , i need them to be combined
query is :
select substr(uh.sstartdatetime,1,8) DateTime,
( case
when uh.sflowtype=7 then 'sms'
when uh.sflowtype=9 then 'mms'
when uh.sflowtype=10 then 'gprs'
else 'voice'
end )
as flowtype from e_vpn_usagehistory uh where 1=1 and uh.nspid='1' AND ((substr(uh.sstartdatetime,1,8) >= 20130507 )
AND (substr(uh.sstartdatetime,1,8) <= 20130606)) GROUP BY substr(uh.sstartdatetime,1,8),uh.sflowtype
order by substr(uh.sstartdatetime,1,8) DESC
result :
DATETIME FLOWTYPE
20130507 voice
20130507 voice
20130507 voice
20130507 sms
20130507 mms
but i need
20130507 voice
20130507 sms
20130507 mms
so what should i do?
please suggest me

Answer 1

996962 wrote:
my query is some thing like this but having more column in select. when i am firing this query it is giving result but that is not proper
my problem is , like if there are 3 more values for uh.sflowtype (0,1,2) then group by is not working for them and those are coming in different row , i need them to be combined
query is :
select substr(uh.sstartdatetime,1,8) DateTime,
( case
when uh.sflowtype=7 then 'sms'
when uh.sflowtype=9 then 'mms'
when uh.sflowtype=10 then 'gprs'
else 'voice'
end )
as flowtype from e_vpn_usagehistory uh where 1=1 and uh.nspid='1' AND ((substr(uh.sstartdatetime,1,8) >= 20130507 )
AND (substr(uh.sstartdatetime,1,8) <= 20130606)) GROUP BY substr(uh.sstartdatetime,1,8),uh.sflowtype
order by substr(uh.sstartdatetime,1,8) DESC
result :
DATETIME FLOWTYPE
20130507 voice
20130507 voice
20130507 voice
20130507 sms
20130507 mms
but i need
20130507 voice
20130507 sms
20130507 mms
so what should i do?
please suggest meWell, you are grouping by substr(uh.sstartdatetime,1,8),uh.sflowtype
so different values of sflowtype that aren't 7,9 or 10 will be grouped separately.
You therefore need to group by your case statement instead of just the sflowtype.
The most worrying thing though is that you have sstartdatetime that appears to be a varchar2 and not a date.
If it is a date, you are applying a substr (which applies to strings) to a date. you then compare the result
of the substr to a number.
This is a recipe for future problems: sort it out using the correct conversion functions with format masks.
Edited by: Paul Horth on May 14, 2013 1:25 PM