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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. 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 numbers 105, 106, or 107 to employee number 102.

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The SET clause in the UPDATE statement is a list of assignments separated by commas. Each assignment identifies a target column to be updated and specifies how to calculate the new value for the target column. Each target column should appear only once in the list; there should not be two assignments for the same target column. The ANSI/ISO specification mandates unqualified names for the target columns, but some SQL implementations allow qualified column names. There can be no ambiguity in the column names anyway, because they must refer to columns of the target table. The expression in each assignment can be any valid SQL expression that yields a value of the appropriate data type for the target column. The expression must be computable based on the values of the row currently being updated in the target table. In most DBMS implementations, the expression may not include any column functions or subqueries. If an expression in the assignment list references one of the columns of the target table, the value used to calculate the expression is the value of that column in the current row before any updates are applied. The same is true of column references that occur in the WHERE clause. For example, consider this (somewhat contrived) UPDATE statement:

Triggers were one of the most widely praised and publicized features of Sybase SQL Server when it was first introduced, and they have since found their way into many commercial SQL products. Although the SQL2 standard provided an opportunity to standardize the DBMS implementation of triggers, the standards committee included check constraints instead. As the trigger and check-constraint examples in the preceding sections show, check constraints can be effectively used to limit the data that can be added to a table or modified in a table. However, unlike triggers, they lack the ability to cause an independent action in the database, such as adding a row or changing a data item in another table. The extra capability provided by triggers has led several industry experts to advocate that they be included in a future SQL3 standard. Other experts have argued that triggers are a pollution of the data management function of a database, and that the functions performed by triggers belong in fourth generation languages (4GLs) and other database tools, rather than in the DBMS itself. While the debate continues, DBMS products have experimented with new trigger capabilities that extend beyond the database itself. These "extended trigger" capabilities allow modifications to data in a database to automatically cause actions such as sending mail, alerting a user, or launching another program to perform a task. This makes triggers even more useful and will add to the debate over including them in future official SQL standards. Regardless of the official stance, it appears that triggers will become a more important part of the SQL language over the next several years.

IMS is still a very widely used DBMS on IBM mainframes. Its raw performance makes it the database of choice in high-volume transaction-processing applications such as processing bank ATM transactions, verifying credit card numbers, and tracking the delivery of overnight packages. Although relational database performance has improved dramatically over the last decade, the performance requirements of applications such as these have also increased, so IMS continues to have a role. In addition, the large amount of corporate data stored in IMS databases insures that IMS use will continue long after relational databases have eliminated the performance barrier.

UPDATE SALESREPS SET QUOTA = 400000.00, SALES = QUOTA WHERE QUOTA < 400000.00;

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