| what is the rowid type ? [message #1380] |
Thu, 25 April 2002 00:58  |
massa
Messages: 12
Registered: April 2002
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Junior Member |
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Like what is written in the subject, I would like to know what is exactly the rowid type. I'm working under Oracle8i and I don't understand what it is.
If someone know, thanks for your help.
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| Re: what is the rowid type ? [message #1386 is a reply to message #1380] |
Thu, 25 April 2002 05:50  |
Epe
Messages: 99
Registered: March 2002
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Member |
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Hello,
every row in a table has an address or id : rowid.
I.e.: SELECT ROWID, ename FROM emp WHERE deptno = 30;
ROWID ENAME
------------------ ----------
00000DD5.0000.0001 KRISHNAN
00000DD5.0001.0001 ARBUCKLE
00000DD5.0002.0001 NGUYEN
If you wrote a select : "select * from emp where rowid = '00000DD5.0000.0001'", you would get the row with ename = 'KRISHNAN'. The rowid is the most performant way to select a row from a table. If you want to use it that way, and you first want to store the rowid in a variable (so you could say "where rowid = rowid_variable"), then you should make the variable of type ROWID.
declare
tab_rid rowid;
amount number;
begin
select rowid
into tab_rid
from table1
where pkey = 1;
....
select field5
into amount
from table1
where rowid = tab_rid;
....
end;
For more info in the on-line Oracle Manuals see :
http://otn.oracle.com/docs/products/oracle8i/doc_library/817_doc/server.817/a76965/c10datyp.htm#918
Success,
epe
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