How to Delete the records based upon Prev and Next rows and assign the date based upon certain conditions

Question

This is my insert Statements for the Source data.

REM INSERTING into EXPORT_TABLE  
SET DEFINE OFF;  
Insert into EXPORT_TABLE   values (\'4VKMH\',\'GUIDFREE         


        

Answer 1

Let me state up front that I didn't test this in Oracle as I don't have an Oracle database handy.

I pared it down to a single join, it may be useful to compare performance with the accepted answer.

select  
    e1.reg_id,
    e1.product_cd,
    e1.event_type, 
    e1.event_date, 
    e1.term_start_date,
    case e1.event_type when 'CANCELLATION' then e1.term_end_date else coalesce(e2.term_end_date, e1.term_end_date) end as term_end_date,
    e1.days, 
    e1.amt
from event e1 
    left outer join event e2 on 
        e1.reg_id = e2.reg_id and 
        e1.product_cd = e2.product_cd and 
        e1.term_start_date = e2.term_start_date and 
        (e1.event_type = 'CANCELLATION' or e2.event_type = 'CANCELLATION') and 
        e1.event_date <> e2.event_date  
where trunc(e1.event_date) <> trunc(e2.event_date) or e2.reg_id is null