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sql help
I have the following sql which returns 4 rows, i want to filter it further so that i only display the rows where the timestamp column OTR_TSP_REC_UPDATE is the most recent :
select OTR_RID_OST_TRAN,
OTR_CDE_GROUP_TYPE,
OTR_CDE_OBJ_STATE,
OTS_CID_LENDER,
OTR_AMT_ACTUAL,
OTS_AMT_BOOKING
OTR_TSP_REC_UPDATE,
OTR_DTE_EFFECTIVE
from vls_outstanding
left join vls_ost_tran on OTR_RID_OUTSTANDNG = OST_RID_OUTSTANDNG
join VLS_OST_TR_SG_SHR on OTR_RID_OST_TRAN = OTS_RID_OST_TRAN
where OST_NME_ALIAS = 'BURDON SPO00079'
and OTR_CDE_OBJ_STATE in ('PEND','AWSTA','AWREL' )
and OTR_CDE_GROUP_TYPE in ( 'QLR','LRP')
how should i ammend my code?
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Answers
Putting MAX() in the SELECT clause will give you the max value for each grouping. For example, if your table is like:
myColor, myVal
Red, 1
Red, 1
Red, 2
Green, 1
Green, 2,
Green, 3
Green, 3
Blue, 2
Blue, 2
Blue, 2
Blue, 3
Blue, 3
Putting MAX(myVal) in the SELECT clause will give you one record for each group:
Red, 2
Green, 3
Blue, 3
If you want all records where myVal = MAX(myVal), then you will have to put that condition in the WHERE clause.
Or the analytic version (you have to add whatever fields you need to group by in the "partition by" clause)
select OTR_RID_OST_TRAN,
OTR_CDE_GROUP_TYPE,
OTR_CDE_OBJ_STATE,
OTS_CID_LENDER,
OTR_AMT_ACTUAL,
OTS_AMT_BOOKING
OTR_TSP_REC_UPDATE,
OTR_DTE_EFFECTIVE
from
(
select OTR_RID_OST_TRAN,
OTR_CDE_GROUP_TYPE,
OTR_CDE_OBJ_STATE,
OTS_CID_LENDER,
OTR_AMT_ACTUAL,
OTS_AMT_BOOKING
OTR_TSP_REC_UPDATE,
OTR_DTE_EFFECTIVE,
row_number() over (partition by ..... order by OTR_TSP_REC_UPDATE desc) rn
from vls_outstanding
left join vls_ost_tran on OTR_RID_OUTSTANDNG = OST_RID_OUTSTANDNG
join VLS_OST_TR_SG_SHR on OTR_RID_OST_TRAN = OTS_RID_OST_TRAN
where OST_NME_ALIAS = 'BURDON SPO00079'
and OTR_CDE_OBJ_STATE in ('PEND','AWSTA','AWREL' )
and OTR_CDE_GROUP_TYPE in ( 'QLR','LRP')
)
where rn=1
I think there has been a mistake as the accepted solution appears to me to be the wrong answer. Please read my response to that post above.
The OP says: "display the rows where the timestamp column OTR_TSP_REC_UPDATE is the most recent"
The OP wants only rows that have a timestamp equal to the the max value of OTR_TSP_REC_UPDATE. Not the max value of OTR_TSP_REC_UPDATE for each group.
A bit late? I only recieved the notification that the question was classified as abandoned this morning. Maybe four days is not enough time.
As for the missing group by clause. The OP is not asking for any grouping. The question says he/she wants to, "filter it further so that i only display the rows where the timestamp column OTR_TSP_REC_UPDATE is the most recent". The key word being "filter". There is no group by clause in the orignal post and none is needed. The OP wants to see ALL rows with timestamp equal to the latest value. Hence, it is a matter of adding another condition to the WHERE clause. Please reread the question.
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by: adlink_laPosted on 2008-08-22 at 19:59:47ID: 22295546
I think this should give you what you want...
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