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Earlier in the chapter, you state that statements such as the SELECT, DELETE, UPDATE, and CREATE TABLE statements must be executed within the context of a transaction. However, we have not been using transactions in the examples and Try This exercises throughout the book. When are transactions used Throughout the book, we have been using interactive SQL (direct invocation) to communicate with the database. Most of the SQL statements that we have been executing within this environment have been done within the context of a transaction, even though you weren t aware of that happening. For most SQL implementations, each SQL statement is considered its own transaction, a processing mode that is often called autocommit. When you execute the statement, a transaction is initiated. If the statement is successful, any changes made are committed to the database and the transaction is terminated, in much the same way as if you had executed a COMMIT statement. If the statement is not successful, the changes are rolled back, the database is returned to the state it was in when the statement was first executed, and the transaction is terminated, as though you executed a ROLLBACK statement. Although interactive SQL tends to treat each statement as its own transaction, you can usually execute transaction-related statements in this environment. However, which statements you can execute and what options they support vary from product to product, so make sure you check the documentation. In general, it is not necessary to specifically define a transaction in interactive SQL.

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Try This 16-1

Like the DELETE statement, the UPDATE statement can update several rows at once with the proper search condition, as in this example: Transfer all salespeople from the Chicago office (number 12) to the New York office (number 11), and lower their quotas by 10 percent UPDATE SALESREPS SET REP_OFFICE = 11, QUOTA = 9 * QUOTA WHERE REP_OFFICE = 12 3 rows updated In this case, the WHERE clause selects several rows of the SALESREPS table, and the value of the REP_OFFICE and QUOTA columns are modified in all of them Conceptually, SQL processes the UPDATE statement by going through the SALESREPS table row by row, updating those rows for which the search condition yields a TRUE result and skipping over those for which the search condition yields a FALSE or NULL result.

In this Try This exercise you will create several transactions that execute statements against the INVENTORY database. For each transaction, you will explicitly start the transaction and execute one or more SQL statements. For this exercise, you will work with the COMMIT statement and ROLLBACK statement in separate transactions because you re working with directly invoked SQL (in your client application). However, if you were initiating transactions from within an application programming language, you would no doubt be using COMMIT and ROLLBACK together in some sort of conditional structure. In that way, certain results would cause the transaction to roll back, and other results would cause the transaction to commit, depending on how you set up the conditions in the programming language. However, for this exercise, we keep them separate so that you can effectively run through these steps. You can download the Try_This_16.txt file, which contains the SQL statements used in this exercise.

1. Open the client application for your RDBMS and connect to the INVENTORY database. 2. The first transaction that you ll create uses a START TRANSACTION statement to set the

Because it searches the table, this form of the UPDATE statement is sometimes called a searched UPDATE statement This term distinguishes it from a different form of the UPDATE statement, called a positioned UPDATE statement, which always updates a single row The positioned UPDATE statement applies only to programmatic SQL and is described in 17 Here are some additional examples of searched UPDATE statements: Reassign all customers served by employee number 105, 106, or 107 to employee number 102 UPDATE CUSTOMERS SET CUST_REP = 102 WHERE CUST_REP IN (105, 106, 107) 5 rows updated Assign a quota of $100,000 to any salesperson who currently has no quota UPDATE SALESREPS SET QUOTA = 10000000 WHERE QUOTA IS NULL.

isolation level to READ UNCOMMITTED, retrieves information from the ARTISTS table, and then commits the transaction. Enter and execute the following SQL transaction:

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