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 browser ( id int, name text, market_share real )
TABLE: CREATE TABLE accelerator_compatible_browser ( accelerator_id int, browser_id int, compatible_since_year int )
TABLE: CREATE TABLE Web_client_accelerator ( id int, name text, Operating_system text, Client text, Connection text )

### Question ###
Draw a bar chart of operating system versus the total number, and list by the Y in desc please.

### Accurate SQL ###

SELECT Operating_system, COUNT(*) FROM Web_client_accelerator GROUP BY Operating_system ORDER BY COUNT(*) DESC