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Cómo SUM tipo de datos numérico postgreSQL

Soy nuevo usando postgresql y tengo un problema cuando sumo el registro, porque da un resultado cero.

esta es mi tabla db

 user_id amount 981 1200000.0000 981 -170000.0000 981 -144500.0000 981 -249800.0000

el campo de cantidad usando el tipo de datos "numérico" y esta es mi consulta

 SELECT user_id, SUM(amount) as amount FROM transaction where user_id = 981;

como solucionar esto, gracias

over 4 years ago · Santiago Trujillo
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