how many companies were founded in rivière-des-prairies–pointe-aux-trembles ?
SELECT DISTINCT COUNT attr_open var_uri attr_close where brack_open var_x dbo_part dbr_Rivière-des-Prairies–Pointe-aux-Trembles sep_dot var_uri dbo_foundationPlace var_x sep_dot var_uri a dbo_Company brack_close