Can we delete duplicate records from a table in teradata without using intermediate table

Question

Can we delete duplicate records from a multiset table in teradata without using intermediate table.

Suppose we have 2 rows with values 1, 2, 3 and 1, 2, 3 in my mu

Answer 1

Use the same approach, but create a volatile table in the middle.

CREATE VOLATILE MULTISET TABLE TEMPDB.TEMP_DUP_ID (
Row_ID DECIMAL(31,0) ) PRIMARY INDEX (Row_ID) ON COMMIT PRESERVE ROWS;

INSERT INTO TEMPDB.TEMP_DUP_ID SELECT ROW_ID FROM DB.TABLE T QUALIFY ROW_NUMBER() OVER (PARTITION BY DUP ORDER BY DUP DESC) > 1

Then use the table to delete.

Ideally you will have unique key per row, otherwise, you will need to manipulate the data a bit more to generate one (with row_number() for instance... This is just a recommendation).