If I stop a long running query, does it rollback?

Question

A query that is used to loop through 17 millions records to remove duplicates has been running now for about 16 hours and I wanted to know if the query is sto

Answer 1

As a loop your query will struggle to scale well, even with appropriate indexes. The query should be rewritten to a single statement, as per the suggestions in your previous question on this.

If you're not running it explicitly within a transaction it will only roll back the executing statement.