3 votes 3 votes Which of the following is used to write both safe and unsafe expression? (A) SQL (B) Relational Algebra (C) Relational Calculus (D) Both B and C Databases gateforum-test-series + – Mk Utkarsh asked Jan 23, 2018 Mk Utkarsh 367 views answer comment Share Follow See 1 comment See all 1 1 comment reply Anu007 commented Jan 23, 2018 reply Follow Share Relational calculus (TRC) 2 votes 2 votes Please log in or register to add a comment.
Best answer 0 votes 0 votes In Tuple Relational Calculus and Domain Relational, we can have safe and unsafe expressions. So, answer should be (C). http://www.cs.sfu.ca/CourseCentral/354/zaiane/material/notes/Chapter3/node14.html https://stackoverflow.com/questions/44913692/unsafe-tuple-calculus-expressions Rishabh Gupta 2 answered Jan 23, 2018 selected Jan 23, 2018 by Mk Utkarsh Rishabh Gupta 2 comment Share Follow See all 0 reply Please log in or register to add a comment.
0 votes 0 votes option c SQL and Relational algebra both are safe . relational Calculus may not be safe. abhishekmehta4u answered Mar 30, 2018 abhishekmehta4u comment Share Follow See all 0 reply Please log in or register to add a comment.