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Challenging SQL

Challenging SQL

Challenging SQL


I have 2 tables

Table S
(S_rec_key  decimal (15),
 S_route    varchar (50,0)
primary index (s_rec_key)

Table E
(E_rec_key  decimal (15,0),
 S_rec_key  decimal(15,0),
 E_stn      varchar (3,0),
 E_dtm      timestamp

Table S contains information on the account and table E contains mutiple events for account. What I would like is that the field S.S_route in order of the E.E_dtm. Two events follwoing each other with the same E.E_stn are considered as one.

S values (1,NULL)
S values (2, NULL)
E values (5,1,'BRU',TIMESTAMP '20070712 12:12:12')
E values (5,2,'AMS',TIMESTAMP '20070711 10:12:12')
E values (5,1,'BRU',TIMESTAMP '20070712 12:11:12')
E values (5,1,'FRA',TIMESTAMP '20070713 12:12:12')
E values (5,2,'CDG',TIMESTAMP '20070710 12:12:12')
E values (5,2,'HKG',TIMESTAMP '20070713 09:12:12')

I want a query that has as result that S looks like this:


Is this possible in pure sql?



RE: Challenging SQL

May be as simple as this. Did not check the syntax and may have misunderstood the question - the key element to eliminate 'duplicates' is the distinct DML statement.

select distinct e.e_stn
from e,
where e.e_s_rec_key
=     s.s_rec_key

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