0 votes 0 votes Which of the following relational operators is commutative? 1. Difference, Union 2. Full outer join and Left outer join 3. Full outer join and intersection 4. Right outer join and Union Databases nptel-quiz databases + – gulsanchouhan asked Aug 25, 2017 gulsanchouhan 492 views answer comment Share Follow See all 0 reply Please log in or register to add a comment.
0 votes 0 votes option 3 Full outer join and intersection. Because A ∩ B and B ∩ A produce same output table. Similarly in the case of Full outer join also. Abhi Girin answered Aug 25, 2017 Abhi Girin comment Share Follow See 1 comment See all 1 1 comment reply Gurdeep Saini commented Dec 20, 2018 reply Follow Share Because A ∩ B and B ∩ A produce same output table. according to your logic union is also commutative but the given answer is option 3 https://nptel.ac.in/courses/106104135/Assignment4.pdf Q6 0 votes 0 votes Please log in or register to add a comment.
