mySQL study notes-DML-DML I don't know

1: Demand, we need to delete all the data in the table

　　　　Method 1: delete from table (table name); however, we do not recommend this, because the number of data in the table will be deleted as many times as necessary, which will consume time and performance.

　　　　Method two (recommended): TRUNCATE TABLE table name ---------- delete the table and create an identical empty table