Tarea SQL Query Arredondo Amaro Carlos Jair, Prolog

Tarea SQL Query Arredondo Amaro Carlos Jair

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select mercado, industria, count(*)/(select count(*) from balances) as proba from balances where mercado in (select distinct mercado from balances) and industria in(select distinct industria from balances) group by mercado,industria

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