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The third category of SQL*Plus variables is system variables. The values of these systemdefined SQL*Plus variables control the overall behavior of SQL*Plus. You already saw various examples of these system variables, such as PAGESIZE and PAUSE, in 2. In the previous section, you learned that you need the SQL*Plus commands DEFINE and UNDEFINE to manage user-defined variables. For system variables, you need the SQL*Plus commands SET and SHOW to assign or retrieve values, respectively. You can also manage SQL*Plus system variables via the Options Environment menu option. Listing 11-11 shows some examples of system variables. Listing 11-11. Some SQL*Plus System Variable Examples SQL> show pagesize pagesize 36 SQL> show pause PAUSE is OFF SQL> set SQL> set SQL> set pause '[Enter]... ' pause on pagesize 10
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SQL> select * from employees; [Enter]... EMPNO ----7369 7499 7521 ENAME -------SMITH ALLEN WARD INIT ----N JAM TF JOB MGR BDATE MSAL COMM DEPTNO -------- ----- ----------- ----- ----- -----TRAINER 7902 17-DEC-1965 800 20 SALESREP 7698 20-FEB-1961 1600 300 30 SALESREP 7698 22-FEB-1962 1250 500 30
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CHAPTER 11 SQL*PLUS AND i SQL*PLUS
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7566 JONES 7654 MARTIN 7698 BLAKE 7782 CLARK [Enter]... EMPNO ----7788 7839 7844 7876 7900 7902 7934 ENAME -------SCOTT KING TURNER ADAMS JONES FORD MILLER
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MANAGER SALESREP MANAGER MANAGER
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2975 1250 2850 2450
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20 30 30 10
INIT ----SCJ CC JJ AA R MG TJA
JOB MGR BDATE MSAL COMM DEPTNO -------- ----- ----------- ----- ----- -----TRAINER 7566 26-NOV-1959 3000 20 DIRECTOR 17-NOV-1952 5000 10 SALESREP 7698 28-SEP-1968 1500 0 30 TRAINER 7788 30-DEC-1966 1100 20 ADMIN 7698 03-DEC-1969 800 30 TRAINER 7566 13-FEB-1959 3000 20 ADMIN 7782 23-JAN-1962 1300 10
14 rows selected. SQL> set pause off pagesize 42 SQL> show all ... SQL> If you execute the last command of Listing 11-11 (SHOW ALL), you will see that the number of SQL*Plus system variables is impressive. That s why the output in Listing 11-11 is suppressed. Table 11-1 shows an overview of the SQL*Plus system variables, listing only the most commonly used SQL*Plus system variables. Where applicable, the third column shows the default values. In the first column, the brackets indicate abbreviations you may want to use. Table 11-1. Some Common SQL*Plus System Variables
Variable
COLSEP CON[CAT] DEF[INE] ECHO FEED[BACK] HEA[DING] HEADS[EP] LIN[ESIZE] LONG NEWP[AGE] NULL NUMF[ORMAT]
Description
String to display between result columns Character to mark the end of a variable name Character to refer to variable values Display or suppress commands (relevant only for scripts) Display ... rows selected from a certain minimum result size Display column names above results Divide column headers over multiple lines Line or screen width, in characters Default width for LONG columns Number of empty lines after every page break Display of null values in the results Default format to display numbers
Default
" " (space) . (period) & (ampersand) OFF 6 ON | (vertical bar) 80 80 1
CHAPTER 11 SQL*PLUS AND i SQL*PLUS
Variable
NUM[WIDTH] PAGES[IZE] PAU[SE] SQLP[ROMPT] SQLT[ERMINATOR] TIMI[NG] TRIMS[POOL] USER VER[IFY]
Description
Default width for numeric columns Number of lines per page Display results per page SQL*Plus prompt string SQL command delimiter (execute the command) Show elapsed time after each command Suppress trailing spaces in spool files Username for the current SQL*Plus session (cannot be set) Show command lines before/after variable substitution
Default
10 14 OFF SQL> ; (semicolon) OFF OFF ON
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.
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.
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
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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