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select branch-name from branch where assets > all (select assets from branch where branch-city = Brooklyn ) As it does for some, SQL also allows < all, <= all, >= all, = all, and <> all comparisons As an exercise, verify that <> all is identical to not in As another example of set comparisons, consider the query Find the branch that has the highest average balance Aggregate functions cannot be composed in SQL Thus, we cannot use max (avg ( )) Instead, we can follow this strategy: We begin by writing a query to nd all average balances, and then nest it as a subquery of a larger query that nds those branches for which the average balance is greater than or equal to all average balances: select branch-name from account group by branch-name having avg (balance) >= all (select avg (balance) from account group by branch-name)

SQL includes a feature for testing whether a subquery has any tuples in its result The exists construct returns the value true if the argument subquery is nonempty Using the exists construct, we can write the query Find all customers who have both an account and a loan at the bank in still another way:

In this example, you can see two active SIP sessions, where each call-id represents a separate phone session The first session is in a Call init state, which indicates that the call is still being established (the caller sent the INVITE message and hasn t see the 200 OK final response) The second session is in an active state, which means that the call has been established (the RTP connections have been negotiated) This session has been idle for 5 seconds

select customer-name from borrower where exists (select * from depositor where depositorcustomer-name = borrowercustomer-name) We can test for the nonexistence of tuples in a subquery by using the not exists construct We can use the not exists construct to simulate the set containment

Here s a simple example of an inspection policy for SIP:

Assemble a work team of specialists from sales operations, finance, and information technology (IT) to examine automation alternatives and select a preferred system Get approval and funding for a solution (See Appendix C for a list of incentive software vendors) Test automation solution prior to program launch

The McGraw Hill Companies, 2001

ciscoasa(config)# policy-map type inspect sip L7_sip_policy ciscoasa(config-pmap)# parameters ciscoasa(config-pmap-p)# no im ciscoasa(config-pmap-p)# rtp-conformance enforce-payloadtype ciscoasa(config-pmap-p)# software-version action mask log ciscoasa(config-pmap-p)# state-checking action drop log ciscoasa(config-pmap-p)# strict-header-validation action drop log ciscoasa(config-pmap-p)# traffic-non-sip ciscoasa(config-pmap-p)# uri-non-sip action mask log ciscoasa(config)# policy-map global_policy ciscoasa(config-pmap)# class inspection_default ciscoasa(config-pmap-c)# inspect sip L7_sip_policy ciscoasa(config)# service-policy global_policy global

(that is, superset) operation: We can write relation A contains relation B as not exists (B except A) (Although it is not part of the SQL-92 and SQL:1999 standards, the contains operator was present in some early relational systems) To illustrate the not exists operator, consider again the query Find all customers who have an account at all the branches located in Brooklyn For each customer, we need to see whether the set of all branches at which that customer has an account contains the set of all branches in Brooklyn Using the except construct, we can write the query as follows: select distinct Scustomer-name from depositor as S where not exists ((select branch-name from branch where branch-city = Brooklyn ) except (select Rbranch-name from depositor as T, account as R where Taccount-number = Raccount-number and Scustomer-name = Tcustomer-name)) Here, the subquery (select branch-name from branch where branch-city = Brooklyn ) nds all the branches in Brooklyn The subquery (select Rbranch-name from depositor as T, account as R where Taccount-number = Raccount-number and Scustomer-name = Tcustomer-name) nds all the branches at which customer Scustomer-name has an account Thus, the outer select takes each customer and tests whether the set of all branches at which that customer has an account contains the set of all branches located in Brooklyn In queries that contain subqueries, a scoping rule applies for tuple variables In a subquery, according to the rule, it is legal to use only tuple variables de ned in the subquery itself or in any query that contains the subquery If a tuple variable is de ned both locally in a subquery and globally in a containing query, the local de nition applies This rule is analogous to the usual scoping rules used for variables in programming languages

13:

SQL includes a feature for testing whether a subquery has any duplicate tuples in its result The unique construct returns the value true if the argument subquery contains