There are two schemas in Oracle11g. For example db1 and db2.
They have same structure of tables and different data to each other.
Now I want to merge data on db1 with data on db2 with no duplication.
But I can’t, duplication is happened.
I tried two different ways like bellow:
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Import from dumpFile.db1 into db1 then import from dumpFile.db2 into db1.
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After import data into both schemas and executo direct path insert.
insert/*+ APPEND */ into db1.myTable (SELECT * FROM db2,myTable);.
Are there good way to merge without duplication?
Best Answer
Just add a WHERE clause to your select that eliminates the duplicates:
If you don't have a field like ID that is unique across the two tables, then you will need to compare more fields, perhaps all of them.