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Message Posted: Fri, 12 Aug 2005 @ 08:25:08 GMT


     
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Subj:   ROWID based join!
 
From:   S.Aananth

Hello All,

I was being interviewd yesterday and the interviewer put to me these 2 questions which baffled me. I just thought may be he IS right under certain circumstances. Can someone help?

1. Find avg sal by dept. -- I said -> sel avg(sal) from emp group by deptno. He insisted that deptno would have to be selected in the select clause else an error will b thrown. I just tested it after coming back home and it did work!! Are there specific conditions where it wouldnt -- like will work in BTET and not in ANSI or BTEQ & SQLA etc??

2. What is a ROWID based join? - I've come across rowhash based and rowkey based join -- but what is a ROWID based join? I just sifted thru the materials i've got and tried some explain but couldnt find out. Is there such a join - anyone?


Thanks

Aananth



     
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