delete from table-name
Since there is no where clause, then all rows are affected.
If there are a large number of rows, your transaction log may fill up, since all the deletes are in a single unit of work. There are ways around this such as:
1. Alter table to not logged initially (search this forum for details).
2. Load table from /dev/null file with replace option.
3. Increase log file size, and number of primary and secondary logs