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  2. RPG400-L
  3. October 2019

Re: sql equivalent to chain and readpe

Oops sorry - you probably want DESC on the order by on TYPE and DATE

e.g

select t1.*, t2.*
from FILE t1
left join lateral (
select t2.* from FILE t2
where t1.id = t2.id
and t2.type < 'REPAIR'
order by id, type DESC, date DESC
fetch first row only) as t2 on 1 = 1
where t1.type = 'REPAIR'

On Tue, 29 Oct 2019 at 14:29, Craig Richards <craig@xxxxxxxxxxxxxxxx> wrote:

Mike,

Looking at your data and keys:

ID TYPE Date Status
21489 RECHECK 20180928 2
21489 REGRADE 20180418 2
21489 REPAIR 20190102 0

Key in file is ID,TYPE,Date

The previous record in ID / TYPE sequence would be 21489 RECHECK.

So - what about this:

select t1.*, t2.*
from FILE t1
left join lateral (
select t2.* from FILE t2
where t1.id = t2.id
and t2.type < 'REPAIR'
order by id, type, date
fetch first row only) as t2 on 1 = 1
where t1.type = 'REPAIR'

t2.* should have your previous values in.

regards,
Craig





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