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SQL> ; (semicolon) ON OFF OFF
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Let s look at some experiments with SQL*Plus system variables, beginning with the FEEDBACK variable. This variable is a switch (you can set it to ON or OFF) and also a threshold value, as shown in Listing 11-12 where we set it to 4.
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Note In order to save some trees, the listings don t repeat the query results each time. You can easily see the effects of the various system variable values yourself.
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Listing 11-12. Using the FEEDBACK System Variable SQL> select * from departments; DEPTNO -------10 20 30 40 DNAME ---------ACCOUNTING TRAINING SALES HR LOCATION MGR -------- -------NEW YORK 7782 DALLAS 7566 CHICAGO 7698 BOSTON 7839
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SQL> set feedback 4 SQL> / DEPTNO -------10 20 30 40 DNAME ---------ACCOUNTING TRAINING SALES HR LOCATION MGR -------- -------NEW YORK 7782 DALLAS 7566 CHICAGO 7698 BOSTON 7839 <<<
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4 rows selected. SQL> select * from employees; ... SQL> set feedback off SQL> show feedback feedback OFF SQL> / ... SQL> set feedback 10 SQL>
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Using COLSEP and NUMWIDTH, as shown in Listing 11-13, the default space separating the result columns is replaced by a vertical line, and the GRADE and BONUS columns are now 10 columns wide. Listing 11-13. Using the COLSEP and NUMWIDTH System Variables SQL> select * from salgrades; GRADE LOWERLIMIT UPPERLIMIT BONUS ------ ---------- ---------- -----1 700 1200 0 2 1201 1400 50 3 1401 2000 100 4 2001 3000 200 5 3001 9999 500 SQL> set colsep " | " SQL> set numwidth 10 SQL> /
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GRADE ---------1 2 3 4 5 SQL>
| LOWERLIMIT | UPPERLIMIT | BONUS | ---------- | ---------- | ---------| 700 | 1200 | 0 | 1201 | 1400 | 50 | 1401 | 2000 | 100 | 2001 | 3000 | 200 | 3001 | 9999 | 500
Listing 11-14 shows examples of using NULL and NUMFORMAT. The NULL system variable makes all null values more visible. The NUMFORMAT variable allows you to influence the layout of all numeric columns. It supports the same formats as the SQL*Plus COLUMN command (see Appendix A of this book or SQL*Plus User s Guide and Reference for details). Listing 11-14. Using the NULL and NUMFORMAT System Variables SQL> set numwidth 5 SQL> set null " [N/A]" SQL> select ename, mgr, comm 2 from employees 3 where deptno = 10; ENAME MGR COMM -------- ------ -----CLARK 7839 [N/A] KING [N/A] [N/A] MILLER 7782 [N/A] SQL> set numformat 09999.99 SQL> select * from salgrades; GRADE LOWERLIMIT UPPERLIMIT BONUS --------- ---------- ---------- --------00001.00 00700.00 01200.00 00000.00 00002.00 01201.00 01400.00 00050.00 00003.00 01401.00 02000.00 00100.00 00004.00 02001.00 03000.00 00200.00 00005.00 03001.00 09999.00 00500.00 SQL> As Listing 11-15 shows, you can use the DEFINE system variable as a switch (ON or OFF) and you can also change the DEFINE character, if you need the ampersand character (&) without its special meaning.
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Listing 11-15. Using the DEFINE System Variable SQL> select 'Miracle&Co' as result from dual; Enter value for co: Breweries RESULT ---------------MiracleBreweries SQL> set define off SQL> run 1* select 'Miracle&Co' as result from dual RESULT ---------Miracle&Co SQL> set define ! SQL> select 'Miracle&Co' as result from !table; Enter value for table: dual RESULT ---------Miracle&Co SQL> set define & SQL>
Tip You have changed a lot of SQL*Plus settings in this section. In order to make a clean start, it is a good idea to exit SQL*Plus and to start a new session. This will reset all SQL*Plus variables to their default values.
11.2 Bind Variables
The previous section discussed SQL*Plus variables, which are variables maintained by the tool SQL*Plus. The SQL*Plus client-side program replaces all variables with actual values before the SQL commands are sent to the Oracle DBMS. This section discusses bind variables, an important component of the SQL language. To be more precise, bind variables are a component of dynamic SQL, a PL/SQL interface that allows you to build and process SQL statements at runtime. Bind variables are tool-independent. Bind variables are extremely important if you want to develop database applications for critical information systems. Suppose you have a database application to retrieve employee details. Application users just enter an employee number in a field on their screen, and then click the Execute button. For example, these SQL statements could be generated for two different database users, or for the same user using the same application twice:
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