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Oracle PL/SQL/Constraints/Enable Disable Primary Key - История изменений
2026-05-25T19:44:13Z
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в 13:45, 26 мая 2010
2010-05-26T13:45:19Z
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http://sqle.ru/index.php?title=Oracle_PL/SQL/Constraints/Enable_Disable_Primary_Key&diff=2555&oldid=prev
Admin: 1 версия
2010-05-26T10:01:58Z
<p>1 версия</p>
<p><b>Новая страница</b></p><div>==Disable a Primary Key==<br />
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<!-- start source code --><br />
<br />
<source lang="sql"><br />
<br />
SQL> -- Disable a Primary Key<br />
SQL><br />
SQL> CREATE TABLE supplier<br />
2 ( supplier_id numeric(10) not null,<br />
3 supplier_name varchar2(50) not null,<br />
4 contact_name varchar2(50)<br />
5 );<br />
Table created.<br />
SQL><br />
SQL> desc supplier;<br />
Name Null? Type<br />
----------------------------------------------------------------------------------------------------- -------- --------------------------------------------------------------------<br />
SUPPLIER_ID NOT NULL NUMBER(10)<br />
SUPPLIER_NAME NOT NULL VARCHAR2(50)<br />
CONTACT_NAME VARCHAR2(50)<br />
SQL><br />
SQL> ALTER TABLE supplier<br />
2 add CONSTRAINT supplier_pk PRIMARY KEY (supplier_id);<br />
Table altered.<br />
SQL><br />
SQL> desc supplier;<br />
Name Null? Type<br />
----------------------------------------------------------------------------------------------------- -------- --------------------------------------------------------------------<br />
SUPPLIER_ID NOT NULL NUMBER(10)<br />
SUPPLIER_NAME NOT NULL VARCHAR2(50)<br />
CONTACT_NAME VARCHAR2(50)<br />
SQL><br />
SQL> ALTER TABLE supplier<br />
2 disable CONSTRAINT supplier_pk;<br />
Table altered.<br />
SQL><br />
SQL> desc supplier;<br />
Name Null? Type<br />
----------------------------------------------------------------------------------------------------- -------- --------------------------------------------------------------------<br />
SUPPLIER_ID NOT NULL NUMBER(10)<br />
SUPPLIER_NAME NOT NULL VARCHAR2(50)<br />
CONTACT_NAME VARCHAR2(50)<br />
SQL><br />
SQL> drop table supplier;<br />
Table dropped.<br />
SQL><br />
SQL><br />
<br />
</source><br />
<br />
<br />
<br />
<br />
==Enable a primary key==<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="sql"><br />
<br />
SQL><br />
SQL> CREATE TABLE supplier<br />
2 ( supplier_id numeric(10) not null,<br />
3 supplier_name varchar2(50) not null,<br />
4 contact_name varchar2(50)<br />
5 );<br />
Table created.<br />
SQL><br />
SQL> desc supplier;<br />
Name Null? Type<br />
----------------------------------------------------------------------------------------------------- -------- --------------------------------------------------------------------<br />
SUPPLIER_ID NOT NULL NUMBER(10)<br />
SUPPLIER_NAME NOT NULL VARCHAR2(50)<br />
CONTACT_NAME VARCHAR2(50)<br />
SQL><br />
SQL> ALTER TABLE supplier<br />
2 add CONSTRAINT supplier_pk PRIMARY KEY (supplier_id);<br />
Table altered.<br />
SQL><br />
SQL> desc supplier;<br />
Name Null? Type<br />
----------------------------------------------------------------------------------------------------- -------- --------------------------------------------------------------------<br />
SUPPLIER_ID NOT NULL NUMBER(10)<br />
SUPPLIER_NAME NOT NULL VARCHAR2(50)<br />
CONTACT_NAME VARCHAR2(50)<br />
SQL><br />
SQL> ALTER TABLE supplier<br />
2 disable CONSTRAINT supplier_pk;<br />
Table altered.<br />
SQL><br />
SQL> desc supplier;<br />
Name Null? Type<br />
----------------------------------------------------------------------------------------------------- -------- --------------------------------------------------------------------<br />
SUPPLIER_ID NOT NULL NUMBER(10)<br />
SUPPLIER_NAME NOT NULL VARCHAR2(50)<br />
CONTACT_NAME VARCHAR2(50)<br />
SQL><br />
SQL> ALTER TABLE supplier<br />
2 enable CONSTRAINT supplier_pk;<br />
Table altered.<br />
SQL><br />
SQL> desc supplier;<br />
Name Null? Type<br />
----------------------------------------------------------------------------------------------------- -------- --------------------------------------------------------------------<br />
SUPPLIER_ID NOT NULL NUMBER(10)<br />
SUPPLIER_NAME NOT NULL VARCHAR2(50)<br />
CONTACT_NAME VARCHAR2(50)<br />
SQL><br />
SQL> drop table supplier;<br />
Table dropped.<br />
SQL><br />
SQL><br />
SQL><br />
<br />
</source></div>
Admin