Is there a auto-increment data type in Oracle
Is there a auto-increment data type in Oracle ?
How to do it if there is no auto-increment data type in Oracle ?
null
jackie (guest) wrote:
: Is there a auto-increment data type in Oracle ?
: How to do it if there is no auto-increment data type in Oracle
Hi,
I think you need unique ID's, for this purpose you use sequences
in Oracle. Example:
create table xy (
id number,
name varchar2(100)
alter table xy
add constraint xy_pk primary key(id);
create sequence xy_seq start with 1 maxvalue 99999999999;
(there are many other options for create sequence)
create or replace trigger xy_ins_trg
before insert on xy
for each row
begin
select xy_seq.nextval
into :new.id
from dual;
end;
This produces a unique value for the column id at each insert.
Hope this will help.
peter
null
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제품 : SQL*PLUS
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UNDERSTAND THE NEW DATE AND TIME DATA TYPES IN ORACLE 9I
========================================================
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I am new to Oracle, and I would like toknwo how do you do the following?
Implement a boolean type column (True/False).
Implement a time colum.
How do you set a dafault value for column?
ThanksAll data types are explained in chapter 2 of the SQL Reference manual.
This includes a complete list of available types, the internal representation, formatting options (for dates and numerics), and so on. It varies by version - the docco is generally available through http://docs.oracle.com and for 10g Release 2, the docco is at
http://www.oracle.com/pls/db102/portal.portal_db?selected=1
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