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The CLOSE statement, shown in Figure 17-28, conceptually closes the table of query results created by the OPEN statement, ending access by the application program. Its single parameter is the name of the cursor associated with the query results, which must be a cursor previously opened by an OPEN statement. The CLOSE statement can be executed any time after the cursor has been opened. In particular, it is not necessary to FETCH all rows of query results before closing the cursor, although this will usually be the case. All cursors are automatically closed at the end of a transaction. Once a cursor is closed, its query results are no longer available to the application program.

SQL is thus a comprehensive language for controlling and interacting with a database management system Second, SQL is not really a complete computer language like COBOL, C, C++, or Java Instead, SQL is a database sublanguage, consisting of about 40 statements specialized for database management tasks These SQL statements can be embedded into another language such as COBOL or C to extend that language for use in database access Alternatively, the statements can be explicitly sent to a database management system for processing, via a call-level interface from a language such as C, C++, or Java, or via messages sent over a computer network SQL also differs from other computer languages because it describes what the user wants the computer to do rather than how the computer should do it (In more technical terms, SQL is a declarative or descriptive language rather than a procedural one.

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I SET NULL delete rule The SET NULL delete rule tells the DBMS that when a parent row is deleted, the foreign key values in all of its child rows should automatically be set to NULL Deletions from the parent table thus cause a set to NULL update on selected columns of the child table For the tables in Figure 11-1, this rule can be summarized as If an office is deleted, indicate that the current office assignment of its salespeople is unknown I SET DEFAULT delete rule The SET DEFAULT delete rule tells the DBMS that when a parent row is deleted, the foreign key values in all of its child rows should automatically be set to the default value for that particular column Deletions from the parent table thus cause a set to DEFAULT update on selected columns of the child table.

4 discussed primary keys, foreign keys, and the parent/child relationships that they create between tables. Figure 11-1 shows the SALESREPS and OFFICES tables and illustrates once again how foreign keys and primary keys work. The OFFICE column is the primary key for the OFFICES table, and it uniquely identifies each row. The REP_OFFICE column, in the SALESREPS table, is a foreign key for the OFFICES table. It identifies the office where each salesperson is assigned.

) SQL contains no IF statement for testing conditions, and no GOTO, DO, or FOR statements for program flow control Rather, SQL statements describe how a collection of data is to be organized, or what data is to be retrieved or added to the database The sequence of steps to do those tasks is left for the DBMS to determine Finally, SQL is not a particularly structured language, especially when compared with highly structured languages such as C, Pascal, or Java Instead, SQL statements resemble English sentences, complete with noise words that don t add to the meaning of the statement but make it read more naturally The SQL has quite a few inconsistencies and also some special rules to prevent you from constructing SQL statements that look perfectly legal but that don t make sense.

For the tables in Figure 11-1, this rule can be summarized as If an office is deleted, indicate that the current office assignment of its salespeople is the default office specified in the definition of the SALESREPS table There are some slight differences between the SQL2 and DB2 implementations of the delete rules The current DB2 implementation does not support the SET DEFAULT rule; it is specified only by the SQL2 standard The SQL2 standard actually calls the previously described RESTRICT rule, NO ACTION The SQL2 naming is somewhat confusing It means If you try to delete a parent row that still has children, the DBMS will take no action on the row The DBMS will, however, generate an error code.

Despite the inaccuracy of its name, SQL has emerged as the standard language for using relational databases SQL is both a powerful language and one that is relatively easy to learn The quick tour of SQL in 2 will give you a good overview of the language and its capabilities..

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