Truncate and drop both are similar to each other as they are used to delete the complete data of a table.

The difference between them is this truncate only delete the data of the table where as the table structure is there but when we drop the table the table data is deleted and also the table structure.

truncate

TRUNCATE TABLE  table_name;

ex

+----+----------+-----+-----------+----------+
| ID | NAME     | AGE | ADDRESS   | SALARY   |
+----+----------+-----+-----------+----------+
|  1 | Ramesh   |  32 | Ahmedabad |  2000.00 |
|  2 | Khilan   |  25 | Delhi     |  1500.00 |
|  3 | kaushik  |  23 | Kota      |  2000.00 |
|  4 | Chaitali |  25 | Mumbai    |  6500.00 |
|  5 | Hardik   |  27 | Bhopal    |  8500.00 |
|  6 | Komal    |  22 | MP        |  4500.00 |
|  7 | Muffy    |  24 | Indore    | 10000.00 |
+----+----------+-----+-----------+----------+

TRUNCATE TABLE CUSTOMERS;

now select the data

SELECT * FROM CUSTOMERS;

The result

Empty set (0.00 sec)

drop

+---------+---------------+------+-----+---------+-------+
| Field   | Type          | Null | Key | Default | Extra |
+---------+---------------+------+-----+---------+-------+
| ID      | int(11)       | NO   | PRI |         |       |
| NAME    | varchar(20)   | NO   |     |         |       |
| AGE     | int(11)       | NO   |     |         |       |
| ADDRESS | char(25)      | YES  |     | NULL    |       |
| SALARY  | decimal(18,2) | YES  |     | NULL    |       |
+---------+---------------+------+-----+---------+-------+

drop table

DROP TABLE CUSTOMERS;

select table

DESC CUSTOMERS;

The result

ERROR 1146 (42S02): Table 'TEST.CUSTOMERS' doesn't exist