How to insert data into table from another table without duplicates.

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I am inserting data into table from another table, But I am getting duplicates.
Any body give me where I need to add delete query.

SQL

Insert into tb2(fields)
select * from tb1;

So above query where I need to add delete query for deleting duplicate records.

sol:

Posted 26-Nov-13 21:02pm

Updated 26-Nov-13 23:29pm

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Maciej Los · Answer 1 · 2013-11-26T22:23:00

You need to use subquery as is described in this article: Oracle SQL subquery types in, not in, exists[^].
Example:

SQL

Insert into tb2(Field1, Field2)
SELECT Field1, Field2
FROM tb1
WHERE NOT EXISTS (SELECT Field1 FROM tb1) ;

Posted 26-Nov-13 22:23pm

Comments

Maciej Los 27-Nov-13 5:29am

Please, read my answer? Do i recommend you to delete data? No!

phil.o 27-Nov-13 6:11am

5'd :)

Maciej Los 27-Nov-13 6:19am

Thank you, Phil ;)