0 votes 0 votes shubhamdarokar asked Jan 9, 2017 shubhamdarokar 408 views answer comment Share Follow See all 6 Comments See all 6 6 Comments reply santhoshdevulapally commented Jan 9, 2017 reply Follow Share SELECTION in sql=$\Pi$(projection) in R A. WHERE in sql=$\sigma$(selection) in RA answer is A. 0 votes 0 votes shubhamdarokar commented Jan 9, 2017 reply Follow Share but sql retains duplicate whereas RA does not.So as in tthe sql query distinct is not given so result shud be different. Correct me if i am wrong 0 votes 0 votes santhoshdevulapally commented Jan 9, 2017 reply Follow Share may be different. some times duplicates are not possible for some queries. 0 votes 0 votes shubhamdarokar commented Jan 9, 2017 reply Follow Share then how to know which is the correct one. 0 votes 0 votes santhoshdevulapally commented Jan 9, 2017 reply Follow Share dont be tense,in the gate exam this ambiguity problem is not there. 0 votes 0 votes shubhamdarokar commented Jan 9, 2017 reply Follow Share k thanks 0 votes 0 votes Please log in or register to add a comment.