What is the bookmark lookup and rid lookup?
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Following are some of the question related to below mentioned query? select e1.salary from employee3 e1 where 2= ( select count(distinct(e2.salary)) from employee3 e2 where e2.salary>=e1.salary ) 1) What the query returns? 2) How it works? - Detail explanation (what the sub query does, why it is (where 2=)....etc...Please?
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