Equivalent of DB2 functions in ORACLE 11g

Hi,
I am trying to convert the SQL queries written in DB2 to ORACLE. There are some db2 specific functions are used in the queries.I am not able to find the equivalent function in ORACLE. The function names are written below:
1) DateDD()
2) SELECT @@IDENTITY
3) SELECT *
FROM (
SELECT ROWNUMBER() OVER() AS rowId_1, INNER_TABLE.*
FROM (----)as innertable
) AS Outertable
Error is: ROWNUMBER is INVALID identifier.
4) DAYOFWEEK()
5) DAYS()
6) dayofyear()
Please help me in finding the equivalent function in ORACLE.
Thanks in advance!!

You probably don't need a DateAdd function in Oracle. You can add a number to a date in Oracle-- that adds the number of days to the date.
SELECT sysdate today, sysdate+1 tomorrow
FROM dualWhy are you using DAYS()? If, as in the example, you're just trying to determine the number of days between two dates, you can subtract dates in Oracle and the difference will be a number of days (including a fractional component if applicable)
SELECT date '2011-09-27' - date '2011-09-25' difference_in_days
FROM dualIf you really need the number of days since January 1, 0001, you could subtract the date from Jan 1, 0001, i.e.
SELECT date '2011-09-27' - date '0001-01-01'
FROM dualI would assume that Oracle and DB2 would return the same number but there could well be some differences since the current calendar didn't exist in the year 1 and I know there were issues in the transition from the Gregorian to the Julian calendar where some days were decreed not to exist. It wouldn't shock me if Oracle and DB2 counted some of the days in the 1500's differently.
Justin

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[email protected]

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Message was edited by:
skgoel

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Services Summary...
Service "+ASM" has 1 instance(s).
Instance "+asm1", status READY, has 1 handler(s) for this service...
Service "+ASM_XPT" has 1 instance(s).
Instance "+asm1", status READY, has 1 handler(s) for this service...
Service "ARIBADEV" has 1 instance(s).
Instance "ariba", status READY, has 1 handler(s) for this service...
Service "ARIBADEV_XPT" has 1 instance(s).
Instance "ariba", status READY, has 1 handler(s) for this service...
Service "ARIBAXDB" has 1 instance(s).
Instance "ariba", status READY, has 1 handler(s) for this service...
Service "aiad.corp.nai.org" has 2 instance(s).
Instance "aiad1", status READY, has 2 handler(s) for this service...
Instance "aiad2", status READY, has 1 handler(s) for this service...
Service "aiadXDB.corp.nai.org" has 2 instance(s).
Instance "aiad1", status READY, has 1 handler(s) for this service...
Instance "aiad2", status READY, has 1 handler(s) for this service...
Service "aiad_XPT.corp.nai.org" has 2 instance(s).
Instance "aiad1", status READY, has 2 handler(s) for this service...
Instance "aiad2", status READY, has 1 handler(s) for this service...
Service "aianew" has 1 instance(s).
Instance "aianew", status READY, has 1 handler(s) for this service...
Service "aianewXDB" has 1 instance(s).
Instance "aianew", status READY, has 1 handler(s) for this service...
Service "aianew_XPT" has 1 instance(s).
Instance "aianew", status READY, has 1 handler(s) for this service...
The command completed successfully
C:\>

Equivalent of DB2 functions in ORACLE 11g

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