Run PostgreSQL queries from the command line

Question

I inserted a data into a table....I wanna see now whole table with rows and columns and data. How I can display it through command?

Answer 1

I also noticed that the query

SELECT * FROM tablename;

gives an error on the psql command prompt and

SELECT * FROM "tablename";

runs fine, really strange, so don't forget the double quotes. I always liked databases :-(