Okay, which is it a table with 500 rows of data that you want to delete 300 to 400 rows of data or a table with 300 rows of data that you want to delete 150 to 180 rows of data?
What criteria do you want to use in deleting the data or do you just want to delete any old 150 to 180 or 300 to 400 rows of data depending on which table you are discussing.
If you want help beyond being pointed to the documentation that most likely has examples, you need to give us more information.