1 votes 1 votes Databases databases made-easy-test-series sql relational-algebra + – vaishali jhalani asked Jan 7, 2017 edited Mar 6, 2019 by adeebafatima1 vaishali jhalani 359 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.
0 votes 0 votes In query 1 if condition matches then "where not exit " return false and if condition does not matches then it return true and print all attribute so both query Q1, Q2 is returning all student who never got grade above 4. Shailendra_ answered Nov 10, 2019 Shailendra_ comment Share Follow See all 0 reply Please log in or register to add a comment.