Troube with this sql query

Question

Hi there, I'm sure that this is an easy query but i'm having real trouble writing it, brain freeze today. I thought i had wrote it correctly but obviously not.
select distinct ech.claim_id,
ech.status,
ech.total_usd_value,
ech.total_exchange_value,
ech.examiner_currency
from email_collection_details ecd,
email_collection_header ech,
school_department sd
where ech.year = 2007
and ech.month = 'NOVEMBER'
and (ech.CLAIM_ID is null or ech.CLAIM_ID = v_claim_id)
By taking away the last line of this query, it returns 2 rows. When i add the line it fails to return any rows even if v_vlaim_id contains a value or not.
what have i done wrong?

Answer 1

hi guys.
this is the query in full
select distinct ech.claim_id,
ech.status,
ech.total_usd_value,
ech.total_exchange_value,
ech.examiner_currency
from email_collection_details ecd,
email_collection_header ech,
school_department sc
where ech.year = 2007
and ech.month = 'NOVEMBER'
and (ech.CLAIM_ID is null or ech.CLAIM_ID = 19884)
and (ech.STATUS is null or ech.status = '')
and (ech.EXAMINER_CODE is null or ech.EXAMINER_CODE = '000035')
and (sc.SUBJECT_OPTION is null or sc.SUBJECT_OPTION = '')
and (sc.lvl is null or sc.lvl = '')
and (sc.COMPONENT is null or sc.COMPONENT = '')
and sc.year = ech.year
and sc.month = ech.month
and ecd.claim_id = ech.CLAIM_ID
and ecd.PAPER_CODE = sc.PAPER_CODE
claim_id is a number everything else is a varchar2
this query doesn't return any rows, it should return only 1 row with the claim_id filled in as is, or should return 2 rows with the examiner_code only.
Cheers