Consider this query: Retrieve the SSNs of employees who work on at least those projects on which the… 1 answer below »

Consider this query: Retrieve the SSNs of employees who work on at least those projects on which the employee with SSN = 123456789 works. This may be stated as (FORALL x) (IF P THEN Q), where

• x is a tuple variable that ranges over the PROJECT relation.

• P M employee with SSN = 123456789 works on project x.

• Q M employee e works on project x.

Express the query in tuple relational calculus, using the rules

• ( x)(P(x)) M not( x)(not(P(x))).

• (IF P THEN Q) M (not(P) or Q).

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