How many logical schema (conceptual schema) will be there for a database?

A set of permissible legal values can be specified through ____________________.

For the following relational algebra division operation          (Ta with x rows) / (Tb with y rows) => (Quotient with z rows) which of the following conditions will be correct?  

What is correct about a stored procedure?

What are the quantifiers (marked as “?”) in the following tuple relational calculus query: List of project numbers that involve an employee whose last name is ‘Wong’,  as manager of the controlling department for the project. ans :=    { P.pNumber | projects(P) and    ((? M) (? D)      (employee(M) and department(D) and P.dNumber = D.dNumber and D.mgrSSN = M.eSSN and M.lName = ‘Wong’ ) ) };

What is the purpose of a relational algebra project operation?

Indexes on a table improves performance for ____________________________.

Which constraint will guarantee that a column of a table will have only a set of permissible values?

What is the correct connectivity sequence among database system modules?

If you anticipate running a particular SQL query often, you can improve overall performance by saving the query in a __________________.