I want to fire a query on the table on one particular time, say Sunday 12:00 P.M. Does an SQL table trigger execute...
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this kind of stored query?
You may schedule a procedure to run at any time using the DBMS_JOB supplied package. Simply write a procedure to do what you want and then schedule it to run using the DBMS_JOB.SUBMIT procedure. Besides reading up on the DBMS_JOB package in the Oracle Supplied Packages Reference, there's a great article at: http://www.pinnaclepublishing.com/OP/OPmag.nsf/0/C31F87A073306A72852568F00065982B.
If, however, you are wanting to simply run a query (just a SELECT statement) to spool out a report to a file, then you can use your operating system's scheduling mechanisms (for instance, cron) to cause it to start a SQL*Plus session and run a script (.sql) that contains your query. A good cron overview can be found at: http://www.unixgeeks.org/security/newbie/unix/cron-1.html.
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