How to efficiently delete rows while NOT using Truncate Table in a 500,000+ rows table

Question

Let\'s say we have table Sales with 30 columns and 500,000 rows. I would like to delete 400,000 in the table (those where \"toDelete=\'1\'\").

Answer 1

One way I have had to do this in the past is to have a stored procedure or script that deletes n records. Repeat until done.

DELETE TOP 1000 FROM Sales WHERE toDelete='1'