Syntax:
DROP [TEMPORARY] TABLE [IF EXISTS]
    tbl_name [, tbl_name] ...
    [RESTRICT | CASCADE]

DROP TABLE removes one or more tables. You must have the DROP privilege
for each table.

Be careful with this statement! It removes the table definition and all
table data. For a partitioned table, it permanently removes the table
definition, all its partitions, and all data stored in those
partitions. It also removes the partitioning definition (.par) file
associated with the dropped table.

DROP TABLE causes an implicit commit, except when used with the
TEMPORARY keyword. See
http://dev.mysql.com/doc/refman/5.5/en/implicit-commit.html.

*Important*:

When a table is dropped, privileges granted specifically for the table
are not automatically dropped. They must be dropped manually. See [HELP
GRANT].

If any tables named in the argument list do not exist, the statement
returns an error indicating by name which nonexisting tables it was
unable to drop, but also drops all tables in the list that do exist.

Use IF EXISTS to prevent an error from occurring for tables that do not
exist. Instead of an error, a NOTE is generated for each nonexistent
table; these notes can be displayed with SHOW WARNINGS. See [HELP SHOW
WARNINGS].

IF EXISTS can also be useful for dropping tables in unusual
circumstances under which there is an .frm file but no table managed by
the storage engine. (For example, if an abnormal server exit occurs
after removal of the table from the storage engine but before .frm file
removal.)

The TEMPORARY keyword has the following effects:

o The statement drops only TEMPORARY tables.

o The statement does not cause an implicit commit.

o No access rights are checked. A TEMPORARY table is visible only with
  the session that created it, so no check is necessary.

Using TEMPORARY is a good way to ensure that you do not accidentally
drop a non-TEMPORARY table.

The RESTRICT and CASCADE keywords do nothing. They are permitted to
make porting easier from other database systems.

URL: http://dev.mysql.com/doc/refman/5.5/en/drop-table.html

