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Oracle PL/SQL Tutorial/System Tables Data Dictionary/col - История изменений
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в 13:45, 26 мая 2010
2010-05-26T13:45:46Z
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Admin: 1 версия
2010-05-26T10:08:10Z
<p>1 версия</p>
<p><b>Новая страница</b></p><div>== Query name and segment column length from sys.col table==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="sql"><br />
SQL><br />
SQL><br />
SQL> create or replace type address_type as object<br />
2 ( city varchar2(30),<br />
3 street varchar2(30),<br />
4 state varchar2(2),<br />
5 zip number<br />
6 )<br />
7 /<br />
Type created.<br />
SQL> create or replace type person_type as object<br />
2 ( name varchar2(30),<br />
3 dob date,<br />
4 home_address address_type,<br />
5 work_address address_type<br />
6 )<br />
7 /<br />
Type created.<br />
SQL> create table people of person_type<br />
2 /<br />
Table created.<br />
SQL><br />
SQL> select name, segcollength<br />
2 from sys.col$<br />
3 where obj# = ( select object_id<br />
4 from user_objects<br />
5 where object_name = "PEOPLE" )<br />
6 /<br />
NAME SEGCOLLENGTH<br />
------------------------------ ------------<br />
SYS_NC_OID$ 16<br />
SYS_NC_ROWINFO$ 1<br />
NAME 30<br />
DOB 7<br />
HOME_ADDRESS 1<br />
SYS_NC00006$ 30<br />
SYS_NC00007$ 30<br />
SYS_NC00008$ 2<br />
SYS_NC00009$ 22<br />
WORK_ADDRESS 1<br />
SYS_NC00011$ 30<br />
NAME SEGCOLLENGTH<br />
------------------------------ ------------<br />
SYS_NC00012$ 30<br />
SYS_NC00013$ 2<br />
SYS_NC00014$ 22<br />
14 rows selected.<br />
SQL><br />
SQL><br />
SQL> drop table people;<br />
Table dropped.<br />
SQL><br />
SQL> drop type person_type;<br />
Type dropped.<br />
SQL> drop type address_type;<br />
Type dropped.<br />
SQL></source><br />
<br />
<br />
<br />
== Reference column with user-defined type in select statement==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="sql"><br />
SQL><br />
SQL><br />
SQL> create or replace type address_type as object<br />
2 ( city varchar2(30),<br />
3 street varchar2(30),<br />
4 state varchar2(2),<br />
5 zip number<br />
6 )<br />
7 /<br />
Type created.<br />
SQL> create or replace type person_type as object<br />
2 ( name varchar2(30),<br />
3 dob date,<br />
4 home_address address_type,<br />
5 work_address address_type<br />
6 )<br />
7 /<br />
Type created.<br />
SQL> create table people of person_type<br />
2 /<br />
Table created.<br />
SQL> insert into people values ( "Tom", "15-mar-1965",<br />
2 address_type( "R", "1 Street", "Va", "45678" ),<br />
3 address_type( "R", "1 Way", "Ca", "23456" ) );<br />
1 row created.<br />
SQL> /<br />
1 row created.<br />
SQL><br />
SQL> select name, p.home_address.city from people p;<br />
NAME HOME_ADDRESS.CITY<br />
------------------------------ ------------------------------<br />
Tom R<br />
Tom R<br />
SQL><br />
SQL> drop table people;<br />
Table dropped.<br />
SQL><br />
SQL> drop type person_type;<br />
Type dropped.<br />
SQL> drop type address_type;<br />
Type dropped.</source></div>
Admin