BD_Actividad_Márquez Ami_04-03-2021

Warning: 1691146886/source.prolog:1:
	Singleton variables: [C2]

ERROR: 1691146886/source.prolog:4:143: Syntax error: Unexpected end of file

Select mercado,count(*)/(select count(*) from empresa) as probabilidad from empresa where mercado in(select distinct mercado from empresa) and idempresa in(select distinct idempresa from encadenamiento) group by idempresa, mercado order by mercadoidempresa;