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_3642 ( "Round" real, "Date" text, "Grand Prix" text, "Circuit" text, "MotoGP winner" text, "Moto2 winner" text, "125cc winner" text, "Report" text )

### Question ###
Who are all the motogp winners when the circuit was Catalunya?

### Accurate SQL ###

SELECT "MotoGP winner" FROM table_3642 WHERE "Circuit" = 'Catalunya'