1 votes 1 votes C is provided as the answer. Statement P, I understand but why S is also correct? Databases gateforum-test-series databases relational-algebra + – Gupta731 asked Oct 24, 2018 edited Mar 12, 2019 by akash.dinkar12 Gupta731 429 views answer comment Share Follow See all 2 Comments See all 2 2 Comments reply Shubhanshu commented Oct 24, 2018 reply Follow Share This time Gate forum is correct :) And that is subset not substring in S. Take t2 as {A, B, C} and t1 as {A,B} statement R will lead to error. And thus statement S is true. 1 votes 1 votes Gupta731 commented Oct 24, 2018 reply Follow Share Thank You :D 0 votes 0 votes Please log in or register to add a comment.