Self doubt

Question

What data this query will return please explain someone.. and how we approach this type of query 

Comments

@saif then change the title

i am sure it is already in GO, please check for duplicates before posting a question

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but how to check ???

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please don't add screenshots of question until necessary. otherwise it is difficult to search the questions.

Answer 1

Because
negation  of  (∃∃E2∈∈Employee(E1.salary<E2.salary))

this query will produce

the result with highest salary among all and by applying and operation we will get the highest salary as output.