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To insert data into a relation, we either specify a tuple to be inserted or write a query whose result is a set of tuples to be inserted Obviously, the attribute values for inserted tuples must be members of the attribute s domain Similarly, tuples inserted must be of the correct arity The simplest insert statement is a request to insert one tuple Suppose that we wish to insert the fact that there is an account A-9732 at the Perryridge branch and that is has a balance of $1200 We write insert into account values ( A-9732 , Perryridge , 1200) In this example, the values are speci ed in the order in which the corresponding attributes are listed in the relation schema For the bene t of users who may not remember the order of the attributes, SQL allows the attributes to be speci ed as part of the insert statement For example, the following SQL insert statements are identical in function to the preceding one: insert into account (account-number, branch-name, balance) values ( A-9732 , Perryridge , 1200) insert into account (branch-name, account-number, balance) values ( Perryridge , A-9732 , 1200) More generally, we might want to insert tuples on the basis of the result of a query Suppose that we want to present a new $200 savings acocunt as a gift to all loan customers of the Perryridge branch, for each loan they have Let the loan number serve as the account number for the savings account We write insert into account select loan-number, branch-name, 200 from loan where branch-name = Perryridge Instead of specifying a tuple as we did earlier in this section, we use a select to specify a set of tuples SQL evaluates the select statement rst, giving a set of tuples that is then inserted into the account relation Each tuple has a loan-number (which serves as the account number for the new account), a branch-name (Perryridge), and an initial balance of the new account ($200) We also need to add tuples to the depositor relation; we do so by writing insert into depositor select customer-name, loan-number from borrower, loan where borrowerloan-number = loanloan-number and branch-name = Perryridge.

ciscoasa# show skinny LOCAL FOREIGN STATE -------------------------------------------------1 100110/51237 10031/2000 1 MEDIA 100110/22948 100221/32798 2 100112/51231 10031/2000 1 MEDIA 100112/32798 100210/32948

The McGraw Hill Companies, 2001

This example has two connections from phones (100110 and 100112) to CallManager (10031) these are connections 1 and 2 Below each phone entry is a MEDIA entry, which represents a phone call using RTP Each of the two phones has an active phone call: the first phone has a connection to 100221 and the second phone to 100210

4

Project Steps 1 Fact Finding 2 Assessment 3 Alignment 4 Program Design 5 Support Programs 6 Modeling and Costing 7 Automation 8 Implementation 9 Communication 10 Administration

This query inserts a tuple (customer-name, loan-number) into the depositor relation for each customer-name who has a loan in the Perryridge branch with loan number loannumber It is important that we evaluate the select statement fully before we carry out any insertions If we carry out some insertions even as the select statement is being evaluated, a request such as insert into account select * from account might insert an in nite number of tuples! The request would insert the rst tuple in account again, creating a second copy of the tuple Since this second copy is part of account now, the select statement may nd it, and a third copy would be inserted into account The select statement may then nd this third copy and insert a fourth copy, and so on, forever Evaluating the select statement completely before performing insertions avoids such problems Our discussion of the insert statement considered only examples in which a value is given for every attribute in inserted tuples It is possible, as we saw in 3, for inserted tuples to be given values on only some attributes of the schema The remaining attributes are assigned a null value denoted by null Consider the request insert into account values ( A-401 , null, 1200) We know that account A-401 has $1200, but the branch name is not known Consider the query select account-number from account where branch-name = Perryridge Since the branch at which account A-401 is maintained is not known, we cannot determine whether it is equal to Perryridge We can prohibit the insertion of null values on speci ed attributes by using the SQL DDL, which we discuss in Section 411

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

In certain situations, we may wish to change a value in a tuple without changing all values in the tuple For this purpose, the update statement can be used As we could for insert and delete, we can choose the tuples to be updated by using a query Suppose that annual interest payments are being made, and all balances are to be increased by 5 percent We write update account set balance = balance * 105

ciscoasa(config)# policy-map type inspect skinny L7-skinny-map ciscoasa(config-pmap)# match message-id range 0x200 0x300 ciscoasa(config-pmap-c)# drop log ciscoasa(config-pmap)# parameters ciscoasa(config-pmap-p)# enforce-registration ciscoasa(config)# class-map inspection_default ciscoasa(config-cmap)# match default-inspection-traffic ciscoasa(config)# policy-map global_policy ciscoasa(config-pmap)# class inspection_default ciscoasa(config-pmap-c)# inspect skinny L7-skinny-map ciscoasa(config)# service-policy global_policy global

The McGraw Hill Companies, 2001