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Oracle PL/SQL/Sequence/Create Sequence - История изменений
2026-04-04T10:07:32Z
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в 13:45, 26 мая 2010
2010-05-26T13:45:19Z
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Admin: 1 версия
2010-05-26T09:55:15Z
<p>1 версия</p>
<p><b>Новая страница</b></p><div>==Create a SEQUENCE and retrieve the value==<br />
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<!-- start source code --><br />
<br />
<source lang="sql"><br />
<br />
SQL><br />
SQL> CREATE SEQUENCE supplier_seq<br />
2 MINVALUE 1<br />
3 MAXVALUE 999999999999999999999999999<br />
4 START WITH 1<br />
5 INCREMENT BY 1<br />
6 CACHE 20;<br />
Sequence created.<br />
SQL><br />
SQL> select supplier_seq.nextval from dual;<br />
NEXTVAL<br />
----------<br />
1<br />
SQL> select supplier_seq.nextval from dual;<br />
NEXTVAL<br />
----------<br />
2<br />
SQL> select supplier_seq.nextval from dual;<br />
NEXTVAL<br />
----------<br />
3<br />
SQL> select supplier_seq.nextval from dual;<br />
NEXTVAL<br />
----------<br />
4<br />
SQL><br />
SQL> drop sequence supplier_seq;<br />
Sequence dropped.<br />
SQL><br />
SQL><br />
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</source><br />
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==create sequence emps_seq start with 501 increment by 10==<br />
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<!-- start source code --><br />
<br />
<source lang="sql"><br />
<br />
SQL><br />
SQL> create sequence emps_seq<br />
2 start with 501<br />
3 increment by 10;<br />
Sequence created.<br />
SQL><br />
SQL> drop sequence emps_seq;<br />
Sequence dropped.<br />
SQL><br />
SQL><br />
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</source><br />
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==CREATE SEQUENCE myTableIDSeq INCREMENT BY 1 START WITH 1000;==<br />
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<!-- start source code --><br />
<br />
<source lang="sql"><br />
<br />
SQL><br />
SQL><br />
SQL><br />
SQL> CREATE SEQUENCE myTableIDSeq INCREMENT BY 1 START WITH 1000;<br />
Sequence created.<br />
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</source><br />
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==If id is null, use the value from sequence==<br />
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<!-- start source code --><br />
<br />
<source lang="sql"><br />
<br />
SQL><br />
SQL> create table myTable(<br />
2 id number primary key,<br />
3 blob_content blob<br />
4 )<br />
5 /<br />
Table created.<br />
SQL><br />
SQL> create sequence myTable_seq<br />
2 /<br />
Sequence created.<br />
SQL><br />
SQL> create or replace trigger biu_myTable<br />
2 before insert or update on myTable<br />
3 for each row<br />
4 begin<br />
5 if :new.id is null then<br />
6 select myTable_seq.nextval into :new.id from dual;<br />
7 end if;<br />
8 end;<br />
9 /<br />
Trigger created.<br />
SQL> drop table myTable;<br />
Table dropped.<br />
SQL> drop sequence myTable_seq;<br />
Sequence dropped.<br />
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</source><br />
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==Use dual table to check sequence==<br />
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<!-- start source code --><br />
<br />
<source lang="sql"><br />
<br />
SQL><br />
SQL> create sequence deptno_seq<br />
2 start with 50 increment by 10;<br />
Sequence created.<br />
SQL><br />
SQL> select deptno_seq.nextval, deptno_seq.currval<br />
2 from dual;<br />
NEXTVAL CURRVAL<br />
---------- ----------<br />
50 50<br />
SQL><br />
SQL> select deptno_seq.currval<br />
2 from dual;<br />
CURRVAL<br />
----------<br />
50<br />
SQL><br />
SQL> select deptno_seq.currval, deptno_seq.nextval<br />
2 from dual;<br />
CURRVAL NEXTVAL<br />
---------- ----------<br />
60 60<br />
SQL><br />
SQL><br />
SQL> drop sequence deptno_seq;<br />
Sequence dropped.<br />
<br />
</source></div>
Admin