Issue with minor substitution in sql

Question

I have spend a lot of time trying to get this to work but no joy.
I am using sql developer and the db version is 10.2.0.5
Your help and contribution will be greatly appreciated.
It is a long sql and I am just pasting the FROM statement as that seems the problems is coming from there... It was working before I change the bold from scj_moac to crs.crs_moac. The problems seem to be the left join which I dont really understand
select ..........
FROM SRS_SCJ scj
INNER JOIN srs_cqa cqa
ON cqa.cqa_crsc = scj.scj_crsc
INNER JOIN( INS_STU
LEFT JOIN srs_nat
ON nat_code = stu_natc)
ON stu_code = scj_stuc
LEFT JOIN ( ins_spr spr
LEFT JOIN ( CAM_SAW saw
LEFT JOIN ins_awd awd
ON awd.awd_code = saw.awd_code)
ON saw.spr_code = spr.spr_code
AND saw.aws_code = 'CONF')
LEFT JOIN ins_awd awd2
ON awd2.awd_code = spr.awd_code
ON spr.spr_code = scj_sprc
LEFT JOIN ins_moa moa
ON moa.moa_code = crs.crs_moac
LEFT JOIN srs_crs crs
LEFT JOIN ins_dpt dpt
ON dpt.dpt_code = crs.crs_dptc
ON crs.crs_code = scj.scj_crsc
INNER JOIN srs_sta sta
ON sta.sta_code = scj.scj_stac
The error is:
ORA-00904: "CRS"."CRS_MOAC": invalid identifier
00904. 00000 - "%s: invalid identifier"
*Cause:   
*Action:
Error at Line: 44 Column: 20

Answer 1

Hi,
The join criteria is referencing table alias "prior to its " definition which is CRS.
Example...
with t
(select 'A' x from dual)
, t1 as
(select 'B' x from dual)
, t2 as
(select 'C' x from dual)
select * from a
left outer join b
on a.x = c.x
left outer join c
on b.x = c.x
Error at Command Line:2 Column:1
Error report:
SQL Error: ORA-00904: : invalid identifier
00904. 00000 -  "%s: invalid identifier"However, if you rearrange the "order of tables and join predicates" such that definition of alias is prior to its reference, it'll work fine.
vr