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Oracle PL/SQL Tutorial/Table/Drop Column - История изменений
2026-05-24T14:28:06Z
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в 13:45, 26 мая 2010
2010-05-26T13:45:46Z
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Admin: 1 версия
2010-05-26T10:05:03Z
<p>1 версия</p>
<p><b>Новая страница</b></p><div>== Drop a just added column==<br />
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<!-- start source code --><br />
<br />
<source lang="sql"><br />
SQL><br />
SQL><br />
SQL> create table registrations<br />
2 ( attendee NUMBER(4)<br />
3 , course VARCHAR2(6)<br />
4 , begindate DATE<br />
5 , evaluation NUMBER(1)) ;<br />
Table created.<br />
SQL><br />
SQL><br />
SQL> insert into registrations values (1, "SQL",date "1999-04-12",4 );<br />
1 row created.<br />
SQL> insert into registrations values (2, "SQL",date "1999-12-13",NULL);<br />
1 row created.<br />
SQL> insert into registrations values (3, "SQL",date "1999-12-13",NULL);<br />
1 row created.<br />
SQL> insert into registrations values (4, "OAU",date "1999-08-10",4 );<br />
1 row created.<br />
SQL> insert into registrations values (5, "OAU",date "2000-09-27",5 );<br />
1 row created.<br />
SQL> insert into registrations values (6, "JAV",date "1999-12-13",2 );<br />
1 row created.<br />
SQL> insert into registrations values (7, "JAV",date "2000-02-01",4 );<br />
1 row created.<br />
SQL> insert into registrations values (8, "JAV",date "2000-02-01",5 );<br />
1 row created.<br />
SQL> insert into registrations values (9, "XML",date "2000-02-03",4 );<br />
1 row created.<br />
SQL> insert into registrations values (10,"XML",date "2000-02-03",5 );<br />
1 row created.<br />
SQL> insert into registrations values (1, "PLS",date "2000-09-11",NULL);<br />
1 row created.<br />
SQL> insert into registrations values (2, "PLS",date "2000-09-11",NULL);<br />
1 row created.<br />
SQL> insert into registrations values (3, "PLS",date "2000-09-11",NULL);<br />
1 row created.<br />
SQL><br />
SQL><br />
SQL> alter table registrations<br />
2 add (entered_by number(4) default 7839 not null);<br />
Table altered.<br />
SQL><br />
SQL> alter table registrations<br />
2 drop column entered_by;<br />
Table altered.<br />
SQL><br />
SQL> drop table registrations;<br />
Table dropped.<br />
SQL></source></div>
Admin