453 views

1 Answer

0 votes
0 votes
S1 and S2 two Score table

here.$\ni S1\in marks$ means marks of student S1.

$not\ni  S1\in marks=\vee marks=$all student marks

$e_{2}$ student table which contain city of student.

Now, in this query S1 is one or some student, S2 is all those students whose marks greater than or equal to marks of S1 and lives in Mumbai.

The student who got more than or equal to marks of some student in Mumbai.
edited by

Related questions

0 votes
0 votes
0 answers
1
punit dubey asked Sep 11, 2018
161 views
0 votes
0 votes
1 answer
3
saif asked Aug 10, 2018
303 views
Can anyone explain How to check whether the given tuple relational query is safe or not( any link or blog)