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  3. February 2013

Re: can lateral be made to function like left outer join?

On 19 Feb 2013 09:24, Steve Richter wrote:
<<SNIP>>
( I want to use lateral because lateral supports "fetch first row only" )

AFaIK the Nested Table Expression (NTE) or Derived Table supports the FETCH FIRST clause; i.e. LATERAL need not be specified for the NTE.

select a.srcdta, b.ibmreqd
from qrpglesrc a
, lateral ( select c.ibmreqd from sysibm/sysdummy1 c
where c.ibmreqd = 'N' ) b

The following functions to get the results of the NTE using the FETCH FIRST clause, as tested on v5r3:

SELECT a.srcdta, b.ibmreqd
from QRPGLESRC a
left outer join
(select * from sysibm/sysdummy1 where ibmreqd='X'
fetch first row only) b
on /* 1=1 or... */ srcseq>0


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