if you are using order by in sub query with delete statement like the below :
delete from tAccountScoring where riskscoring_id=1 and id in
(select * from tAccountScoring where last_update <= sysdate-3 AND rownum < 3 AND ACC_ID = 251 over (order by last_update desc))
You will have an error :
Error report:
SQL Error: ORA-00907: missing right parenthesis
00907. 00000 – “missing right parenthesis”
*Cause:
*Action:
The workaround to solve this issue is simple like the below :
delete from tAccountScoring
where riskscoring_id=1 and id in
(select ID from (select * from tAccountScoring
where last_update <= sysdate-3 AND rownum < 3 AND ACC_ID = 251 order by last_update))
Thank you
Osama Mustafa
Technology Geek 
What benefit is there for the delete, to have the list in sorted order?Does it run faster?
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Don hope you doing fine , actually No point at all , but it was challenge between developers team to tweak this and i provide them with solutions
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there is a logical reason for the order by if you use it with “where rownum <= x" as is used here. No reason to use order by in a delete otherwise.
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yes. sometimes is very important to delete in order.example: you have some delete from a couple of tables in order(to respect foreignKeys).for some performance issues you may conditions delete by intervals(500 rows at the time).if you don't order your delete you can have errors…..
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yeeeeeeeeeeeeeeeeeeeee
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