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Oracle PL/SQL Tutorial/Table/comment - История изменений
2026-04-30T17:06:50Z
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в 13:45, 26 мая 2010
2010-05-26T13:45:46Z
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http://sqle.ru/index.php?title=Oracle_PL/SQL_Tutorial/Table/comment&diff=3071&oldid=prev
Admin: 1 версия
2010-05-26T10:05:00Z
<p>1 версия</p>
<p><b>Новая страница</b></p><div>== Add comment to a column==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="sql"><br />
SQL><br />
SQL> create table salgrades<br />
2 ( grade NUMBER(2)<br />
3 , lowerlimit NUMBER(6,2)<br />
4 , upperlimit NUMBER(6,2)<br />
5 , bonus NUMBER(6,2)<br />
6 ) ;<br />
Table created.<br />
SQL><br />
SQL><br />
SQL> comment on column salgrades.lowerlimit<br />
2 is "For sales reps only";<br />
Comment created.<br />
SQL><br />
SQL> drop table salgrades;<br />
Table dropped.<br />
SQL></source><br />
<br />
<br />
<br />
== Create comment for a table==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="sql"><br />
SQL><br />
SQL> create table salgrades<br />
2 ( grade NUMBER(2)<br />
3 , lowerlimit NUMBER(6,2)<br />
4 , upperlimit NUMBER(6,2)<br />
5 , bonus NUMBER(6,2)<br />
6 ) ;<br />
Table created.<br />
SQL><br />
SQL><br />
SQL><br />
SQL> comment on table salgrades<br />
2 is "Salary grades and net bonuses";<br />
Comment created.<br />
SQL><br />
SQL> drop table salgrades;<br />
Table dropped.</source><br />
<br />
<br />
<br />
== Query column comments through user_col_comments==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="sql"><br />
SQL><br />
SQL> create table salgrades<br />
2 ( grade NUMBER(2)<br />
3 , lowerlimit NUMBER(6,2)<br />
4 , upperlimit NUMBER(6,2)<br />
5 , bonus NUMBER(6,2)<br />
6 ) ;<br />
Table created.<br />
SQL><br />
SQL><br />
SQL> comment on column salgrades.bonus<br />
2 is "For sales reps only";<br />
Comment created.<br />
SQL><br />
SQL><br />
SQL><br />
SQL> select comments<br />
2 from user_col_comments<br />
3 where table_name = "SALGRADES"<br />
4 and column_name = "COMM";<br />
no rows selected<br />
SQL><br />
SQL> drop table salgrades;<br />
Table dropped.<br />
SQL><br />
SQL></source><br />
<br />
<br />
<br />
== Query user_tab_comments to check the table comment==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="sql"><br />
SQL><br />
SQL> create table salgrades<br />
2 ( grade NUMBER(2)<br />
3 , lowerlimit NUMBER(6,2)<br />
4 , upperlimit NUMBER(6,2)<br />
5 , bonus NUMBER(6,2)<br />
6 ) ;<br />
Table created.<br />
SQL><br />
SQL><br />
SQL> comment on column salgrades.bonus<br />
2 is "For sales reps only";<br />
Comment created.<br />
SQL><br />
SQL><br />
SQL> select comments<br />
2 from user_tab_comments<br />
3 where table_name = "SALGRADES";<br />
COMMENTS<br />
----------------------------------------------------------------------------------------------------<br />
<br />
SQL><br />
SQL> drop table salgrades;<br />
Table dropped.<br />
SQL></source></div>
Admin