How to create and user Temporary Table ( Urgent Please )

Question

i want to use temporary table in Oracle, how can i use it in Stored procedure, Please explain it with any Example, Please also clear that If more then one user can access the same stored procedure then what will be behavior of Temporary table, is it manage for its session, i want to manage it on every session. when store procedure call temporary table create and when finish then demolished.

Answer 1

It depends on what you mean by a temporary table. If you are coming form a Sybase/Sql Server background where you would do something like:
SELECT * INTO #my_temp
FROM some_table
WHERE some_condition
GO
UPDATE #my_temp
SET some_column = some_calculated_value
GO
SELECT *
FROM #my_temp
WHERE some_other_conditionthen you could use in-line views instead of the temporary table.
SELECT col1,col2,some_calculated_value
FROM (SELECT *
      FROM some_table
      WHERE some_condition)
WHERE some_other_conditionYou should be able to do this directly in a stored procedure, as long as you have some way to process or return the result set.
If your processing is so complex that you cannot do it in straight SQL (and remember, Oracle handles multi-table joins much better that Sybase and SQL Server), then you need to look at Global Temporary Tables.
You would declare a Global Temporary Table outside of the stored procedure (that is create it once and use it over and over), then use it in you stored proc just as you would a regular table. When you create the table, you have a choice of creating it as:
ON COMMIT PRESERVE ROWS which means that any data you put in the table will persist for the length of your session, or
ON COMMIT DELETE ROWS which will empty the table every time you issue a commit;
The rows in the GTT are visible only to the session that put them there, and are removed when that session ends at the latest.
HTH
John