How to implement distinct query in Oracle with grouping?

To achieve group deduplication query in Oracle, you can follow these steps:

1. Use the SELECT statement to choose the fields you want to query, and use the DISTINCT keyword to remove duplicates. For example: SELECT DISTINCT column1, column2 FROM table_name.
2. Group the data as needed using the GROUP BY clause. For example: SELECT column1, column2 FROM table_name GROUP BY column1, column2.
3. If aggregation operations need to be performed on grouped results, aggregation functions such as COUNT, SUM, AVG, etc. can be used. For example: SELECT column1, COUNT(column2) FROM table_name GROUP BY column1.
4. You can filter the aggregated results using the HAVING clause. For instance, you could say: SELECT column1, COUNT(column2) FROM table_name GROUP BY column1 HAVING COUNT(column2) > 10.

Adjustments need to be made according to the specific query requirements and data table structure.