Delete : Just delete the all or particular record (row) from the table. Truncate : Delete the all records(rows) in the table. But structure of the table remains exists. If you truncate the tble tjen you cm add the records to the table. Drop: Delete the table records as well as table structure. If you dropped the table then you cannot add any record to the table.

Drop command removes a table from the database. Truncate Remove all rows from a table, without logging the individual row deletions. In truncate data page is locked before removing it. Truncate and drop both are DDL Commands. In truncate you can not delete specified rows. It is faster than delete. Delete command is used to delete specified rows (one or more). In delete tuple is locked before removing it. You can specified rows using Where Clause. Delete command is DML.