How to eliminate duplicate data in Oracle?

To remove duplicate data in Oracle, you can use one of the following methods:

1. Using the DISTINCT keyword: Selecting non-repetitive data rows with the SELECT DISTINCT statement. For example, the following query will return all unique data rows in the table.
2. Select all unique values from the table.
3. Using ROWID: Selecting data rows using ROWID that are not duplicated. ROWID is a unique identifier for each data row in the Oracle database. The following query will return all non-duplicated data rows in the table:
4. Retrieve all records from the table where the ROWID is not the maximum ROWID for each group based on a certain column.
5. Use the RANK() function to select unique data rows. The RANK() function assigns a ranking to each data row, and selects non-repeating data rows based on the ranking. The following query will return all unique data rows in the table:
6. Retrieve all columns from a table where the rank is equal to 1 within each partition based on a specific column.

Regardless of the method used, it is necessary to choose appropriate column and table names according to the actual situation to eliminate duplicate data.