sql*plus pagesize explained

SQL*Plus is a not only the command-line interface to the database server, it is also a featured reporting tool with paging capabilities. The pagesize is the number of rows of one page. The default is 14 and the maximum is 50000. One of the common property of the page is the headers when selecting from a table.


SQL> sho pages
pagesize 14
SQL> select empno,ename from emp;

     EMPNO ENAME
---------- ----------
      7369 SMITH
      7499 ALLEN
      7521 WARD
      7566 JONES
      7654 MARTIN
      7698 BLAKE
      7782 CLARK
      7788 SCOTT
      7839 KING
      7844 TURNER
      7876 ADAMS

     EMPNO ENAME
---------- ----------
      7900 JAMES
      7902 FORD
      7934 MILLER

14 rows selected.

This is rather an annoying effect of the default setting than a feature and there is no set pagesize unlimited. The only way to have the header only once, is to set the pagesize to the maximum or use this trick : set pages 0 emb on newp none. Unfortunately, the later does not work for HTML reporting.

One of the less known and advanced sql*plus capabilities is the title of the page.

Today on the developpez.net forums I had a question about generating a describe for each table in user_tables.

The short answer is select * from user_tab_columns

In my output, I want to have each table on a separate page, with the table_name in the title, and the column names, not null options and datatypes in the page.

First I want to have a page per table, this I can define with break


bre on table_name ski page

I want to have the table name in the title of the page, but not as a column. I add some blank lines in the top title and in the bottom title.


col table_name new_v table_name nopri
tti le table_name s 2
bti s 1

Finally I set the pagesize to something bigger than the maximum number of columns of tables plus 6 for header and title

set pages 0
col pages new_v pages nopri
select max(count(*))+6 pages
from user_tab_columns
where table_name in (‘EMP’,’DEPT’,’T’)
group by table_name;
set pages &pages

Now the select

select
table_name,
column_name “Name”,
decode(nullable,’N’,’NOT NULL’) “Null?”,
DATA_TYPE||
case when DATA_TYPE in (‘NUMBER’,’FLOAT’)
and (data_precision is not null
or data_scale is not null) then
‘(‘||nvl(DATA_precision,38)||
case when data_scale!=0 then
‘,’||DATA_SCALE
end
||’)’
when data_type like ‘%CHAR%’ then
‘(‘||DATA_LENGTH||’)’ end
“Type”
from user_tab_columns
where table_name in (‘EMP’,’DEPT’,’T’);

DEPT

Name                           Null?    Type
------------------------------ -------- --------------------
DEPTNO                         NOT NULL NUMBER(2)
DNAME                                   VARCHAR2(14)
LOC                                     VARCHAR2(13)

EMP

Name                           Null?    Type
------------------------------ -------- --------------------
EMPNO                          NOT NULL NUMBER(4)
ENAME                                   VARCHAR2(10)
JOB                                     VARCHAR2(9)
MGR                                     NUMBER(4)
HIREDATE                                DATE
SAL                                     NUMBER(7,2)
COMM                                    NUMBER(7,2)
DEPTNO                                  NUMBER(2)

For a HTML report, set mark html on


set mark html on
/

DEPT
Name Null? Type
DEPTNO NOT NULL NUMBER(2)
DNAME   VARCHAR2(14)
LOC   VARCHAR2(13)

 
 

EMP
Name Null? Type
EMPNO NOT NULL NUMBER(4)
ENAME   VARCHAR2(10)
JOB   VARCHAR2(9)
MGR   NUMBER(4)
HIREDATE   DATE
SAL   NUMBER(7,2)
COMM   NUMBER(7,2)
DEPTNO   NUMBER(2)

One thought on “sql*plus pagesize explained”

Leave a Reply

Your email address will not be published.


*

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>