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Oracle PL/SQL/Table/Table Reference - История изменений
2026-05-24T03:42:29Z
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в 13:45, 26 мая 2010
2010-05-26T13:45:19Z
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Admin: 1 версия
2010-05-26T09:54:58Z
<p>1 версия</p>
<p><b>Новая страница</b></p><div>==Reference a table==<br />
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<br />
<br />
<!-- start source code --><br />
<br />
<source lang="sql"><br />
<br />
SQL><br />
SQL><br />
SQL> create table gender_tab (<br />
2 gender_id char(1),<br />
3 gender_nm varchar2(6),<br />
4 constraint gender_pk primary key ( gender_id ),<br />
5 constraint gender_id_ck check ( gender_id in ( "M", "F" ) )<br />
6 );<br />
Table created.<br />
SQL><br />
SQL> insert into gender_tab values ( "F", "Female" );<br />
1 row created.<br />
SQL> insert into gender_tab values ( "M", "Male" );<br />
1 row created.<br />
SQL><br />
SQL><br />
SQL> create table people (first_name varchar2(20),<br />
2 last_name varchar2(25),<br />
3 gender char(1)<br />
4 );<br />
Table created.<br />
SQL><br />
SQL> alter table people<br />
2 add constraint people_gender_fk<br />
3 foreign key ( gender )<br />
4 references gender_tab;<br />
Table altered.<br />
SQL><br />
SQL> insert into people values ( "Celia", "Rice", "M" );<br />
1 row created.<br />
SQL> insert into people values ( "Robert", "Black", "M" );<br />
1 row created.<br />
SQL> insert into people values ( "Linda", "Green", "F" );<br />
1 row created.<br />
SQL><br />
SQL> drop table gender_tab;<br />
drop table gender_tab<br />
*<br />
ERROR at line 1:<br />
ORA-02449: unique/primary keys in table referenced by foreign keys<br />
<br />
SQL><br />
SQL> drop table gender_tab cascade constraints;<br />
Table dropped.<br />
SQL><br />
SQL><br />
SQL><br />
SQL><br />
<br />
<br />
</source><br />
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<br />
<br />
==Using Inheritance Relationships==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="sql"><br />
<br />
SQL> CREATE TABLE Person<br />
2 (id VARCHAR2(10) NOT NULL,<br />
3 name VARCHAR2(20),<br />
4 address VARCHAR2(35),<br />
5 PRIMARY KEY (id));<br />
Table created.<br />
SQL><br />
SQL> CREATE TABLE emp<br />
2 (id VARCHAR2(10) NOT NULL,<br />
3 course VARCHAR2(10),<br />
4 year VARCHAR2(4),<br />
5 PRIMARY KEY (id),<br />
6 FOREIGN KEY (id) REFERENCES Person ON DELETE CASCADE);<br />
Table created.<br />
SQL><br />
SQL><br />
SQL> CREATE TABLE Staff<br />
2 (id VARCHAR2(10) NOT NULL,<br />
3 department VARCHAR2(10),<br />
4 room_no VARCHAR2(4),<br />
5 PRIMARY KEY (id),<br />
6 FOREIGN KEY (id) REFERENCES Person ON DELETE CASCADE);<br />
SQL><br />
SQL><br />
SQL><br />
SQL> drop table Person;<br />
SQL><br />
SQL><br />
SQL> drop table emp;<br />
Table dropped.<br />
SQL><br />
SQL><br />
SQL> drop table Staff;<br />
SQL><br />
SQL><br />
<br />
<br />
<br />
<br />
</source></div>
Admin