Correct it in Oracle

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I am new in oracle so I am not able to write this query in Oracle its showing me some compile time error
main issues are:
1) Not able to use @@identity option which is in sql and return last inserted id (as its auto insert value)

SQL

ALTER PROCEDURE [dbo].[Insert_Update_Students](
@SelectedCourse varchar(4000) = NULL
,@StudentID int = NULL
 output
,@UserID int = NULL
,@YogaBefore bit = NULL
,@YourComment varchar(250) = NULL
)
AS  BEGIN
SET NOCOUNT ON;
IF(@StudentID IS NULL OR @StudentID <= 0)
BEGIN
INSERT INTO Students( 
[SelectedCourse]
,[UserID]
,[YogaBefore]
,[YourComment]
)
VALUES(
@SelectedCourse
,@UserID
,@YogaBefore
,@YourComment
)
set @StudentID=@@identity;
END
ELSE
BEGIN
UPDATE Students SET[SelectedCourse]=@SelectedCourse
,[UserID]=@UserID
,[YogaBefore]=@YogaBefore
,[YourComment]=@YourComment
 where
 [StudentID]=@StudentID

END
END

Posted 1-Sep-14 2:21am

Awadhendra Tripathi

Updated 1-Sep-14 2:23am

v2

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_Asif_ · Answer 1 · 2014-09-01T02:33:00

Oracle Sequence is the alternative of Identity in SQL Server. You need to create a sequence using below SQL Command

CREATE SEQUENCE student_seq
  MINVALUE 1
  MAXVALUE 999999999999999999999999999
  START WITH 1
  INCREMENT BY 1
  CACHE 20;

and then you can easily use sequence in following way

SQL

INSERT INTO Students( StudentId,
,SelectedCourse
,UserID
,YogaBefore
,YourComment
)
VALUES(
student_seq.NEXTVAL,
,@SelectedCourse
,@UserID
,@YogaBefore
,@YourComment

UPDATE Students SET[SelectedCourse]=@SelectedCourse
,[UserID]=@UserID
,[YogaBefore]=@YogaBefore
,[YourComment]=@YourComment
 where
 [StudentID]=student_seq.CURRVAL
)