4 votes 4 votes Which of the following has same expressive power with regard to relational query language? Rational algebra and domain relational calculus Relational algebra and tuples relational calculus Relational algebra and domain relational calculus restricted to safe expression Relational algebra and tuples relational calculus restricted to safe expression i and ii only iii and iv only i and iii only ii and iv only Databases ugcnetcse-june2019-paper2 relational-calculus + – Arjun asked Jul 2, 2019 edited Jan 8 by makhdoom ghaya Arjun 3.6k views answer comment Share Follow See 1 comment See all 1 1 comment reply Abhisek Tiwari 4 commented Jul 3, 2019 reply Follow Share 2 Relational Algebra equivalent in expressing power to A. TRC B. DRC restricted to safe Operation. 0 votes 0 votes Please log in or register to add a comment.
0 votes 0 votes B) c and d only A SAFE EXPRESSION is one that is guaranteed to yield a finite number of tuples as its results. Otherwise, it is called UNSAFE. ex.. {t| ~(t belongs R)} this is unsafe query.. Ajinkya123 answered Jul 19, 2020 Ajinkya123 comment Share Follow See all 0 reply Please log in or register to add a comment.