基本 SQL*Plus 报告：Break On 命令未按预期工作

Question

我正在学习如何编写基本的 SQL*Plus 报告。

在练习时，我遇到了 BREAK ON 命令的问题，不知道如何继续。

作为参考，正在使用的表格称为“报纸”，它包含报纸中专题的名称、该专题所在的版块以及该专题所在的页面。

运行以下报告时，SQL*Plus 按预期返回结果：

rem Newspaper Report

ttitle 'Newspaper Features by Section'
btitle 'Hot off the Presses'

column feature format a15 word_wrapped
column section format a7 
column page format 99
column feature heading 'Feature'
column section heading 'Section'
column page heading 'Page'

break on section skip 1

set linesize 80
set pagesize 40
set newpage 0 
set feedback off

spool test.sql

select section, feature, page from newspaper
order by section;

spool off

输出：

Section Feature         Page
------- --------------- ----
A       National News      1
        Editorials        12

B       Bridge             2
        Movies             4
        Modern Life        1
        Television         7

C       Comics             4
        Weather            2

D       Sports             1

E       Business           1

F       Obituaries         6
        Classified         8
        Doctor Is In       6
        Births             7

在本例中，SQL*Plus 在遇到新特性时会跳过一行。这就是预期的工作方式。

但是，当我执行以下报告时，我的结果并没有按照应有的方式格式化：

rem Newspaper Report

ttitle 'Newspaper Features by Page'
btitle 'Hot off the Presses'

column feature format a15 word_wrapped
column section format a7 
column page format 99
column feature heading 'Feature'
column section heading 'Section'
column page heading 'Page'

break on page skip 1

set linesize 80
set pagesize 40
set newpage 0 
set feedback off

spool test.sql

select page, feature, section from newspaper
order by page;

spool off

输出：

Page Feature         Section
---- --------------- -------
   1 Modern Life     B
     Sports          D
     National News   A
     Business        E
   2 Weather         C
     Bridge          B
   4 Movies          B
     Comics          C
   6 Doctor Is In    F
     Obituaries      F
   7 Television      B
     Births          F
   8 Classified      F
  12 Editorials      A

页面更改时没有跳过任何行。我做错了什么还是命令以这种方式受到限制？

Answer 1

在我看来问题在于列名是“页面”；因为 page 是一个 BREAK ACTION。您可以尝试将列别名为“页面”以外的其他内容并尝试：例如：

column page_temp heading 'Page'

break on page_temp skip 1

set linesize 80
set pagesize 40
set newpage 0 
set feedback off

spool test.sql

select page page_temp, feature, section from newspaper
order by page;