first message: SELECT FROM

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Hi,
This is my first message, and I need some help. I have just installed
Postgresql 8.2. (Windows).

At pgAdmin III Query, when I send SELECT * FROM USUARIOS, I get all
columns correctly. But when I try to get only one column, SELECT senha
FROM USUARIOS, I get the error message:

ERROR: column "senha" does not exist
SQL state: 42703
Character: 8

What is the problem ?

--
--
Aílsom F. Heringer
Rio de Janeiro, Brasil
ailsom@gmail.com
ailsom@uol.com.br

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