Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_2638104_1 (channel VARCHAR, broadcast_area VARCHAR)

### Question ###
How many channels are there in the Greater Tokyo area?

### Accurate SQL ###

SELECT COUNT(channel) FROM table_2638104_1 WHERE broadcast_area = "Greater Tokyo"