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Ajuda em postgreSQL! Treinamento!


Pessoal!! Eu preciso de uma ajudinha pra fazer a questão de número 29, seria ótimo se alguém me ajudasse pois estou preso nesta questao tem bastante tempo no meu treinamento!

Estou usando o programa PostgreSQL em Linux.

OBS: O HD da tabela PC esta em chacacter, terá de usar o cast pra transferi-lo pra double precision e calcular a media!

PLS! Me ajudem!

Captura de tela de 2016-10-14 09:30:04.png

Captura de tela de 2016-10-14 09:30:38.png

Captura de tela de 2016-10-14 09:30:56.png

Edited by DiVinicius

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