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Which of the following relational algebra queries returns a single tuple with a value of 25?

Considering the provided database, after executing the following update statement: UPDATE RideDetail xSET tip = price * 0.1WHERE price > 15; What RID value(s) would be returned by the following query: SELECT RIDFROM Rider rWHERE NOT EXISTS (SELECT * FROM RideDetail x WHERE x.RID = r.RID AND TIP > 4);

Hypothetically, if a constraint were added that a rider can have only one ride per day, how many candidate keys are there for the RideDetail relation?Please note this hypothetical situation applies to only this question.

For a relation  which contains two candidate keys  and :

The UK had it’s first successful “three-parent baby” born in 2023 after changing the laws to allow for mitochondrial replacement therapy in cases that prevent serious genetic disease. 

How many tuples appear in the following query?

Hypothetically, if all NOT NULL constraints are removed from the provided schema, which of the following SQL statements will successfully insert a new row into a table? Please note this hypothetical situation applies to only this question.

The influenza NS1 proteins primarily _______________________.

Influenza produces 11 different proteins from 8 genome segments. Which proteins are NOT packaged into the viral particle?

Which of the following explanation is correct about genome replication (not transcription) in the influenza virus?