How to QUERY (SQL) in QGIS DB Manager?

Question

This is my first time using DB Manager to store data. The Import/Export them was easy. My point is, when i try to run a QUERY it returns this error!

I´m using QGIS 2.18 , PostgreSQL 9.4

Answer 1

When you're using capital letters in names of tables or columns you need to place it in " ". Postgres is case sensitive