Topic: SQL*Plus and PL/SQL >> pseudo columns!!!!
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| Title: pseudo columns!!!! |
| Rush |
Posted: Apr 26, 2007 05:57:03 AM |
Total Post: 127
Joined: Jan, 2007
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hi all,
i want to know about the utilization of level(pseudo column of oracle)
with example.if any body hase some idea then plz.....welcome!!
thanks and regards
RUPESH |
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 snehalatha |
| Posted: Apr 26, 2007 06:05:31 AM |  |
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Total Post: 169
Joined: Apr, 2006
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A pseudo column is not an actual column in the table. They exist at the database level and are not visible in the table structure using 'DESC TABLE_NAME' command.
we can always access them using their names.
For Ex: select col1,col2,uid,sysdate from table1 .....
some of them are
USER, UID, SYSDATE, ROWNUM, ROWID, NULL,LEVEL, versions_xid, versions_operation, versions_startscn, versions_endscn, systimestamp,ora_rowscn, object_value
The most used pseudo column is rownum. it is sometimes used as a unique identifier, in case the table does not have a primary key.
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| Rush |
| Posted: Apr 26, 2007 11:20:51 PM | |
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Total Post: 127
Joined: Jan, 2007
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