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MERGE Statement in Oracle 10G on a single table

 
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Does MERGE statement in Oracle 10G operate on a single table? If yes, can anyone pass a sample code snippet to show how?
I want to Insert into a single table with 4 fields; in case one of the field is already present in the table, then nothing should happen else if that field is not present then i would Insert that record.
I would highly appreciate if anyone throw some views on this.
TIA!
 
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