Category Classes Brand Model
AAA BBB CCC AAA
BBB CCC DDD FFF
CCC AAA BBB ZZZ (* - already exist in table R)
CCC AAA CCC ZZZ
I need to insert data in Table A into Table B, but don't want the duplicate record (see *) as Table R is a reference table and no duplicate records in allowed. How to prevent Table R from having duplicate records after the insertion?
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