grant connect on database

I am using Postgres 9.4. I created a login role and gave select to all
tables to a schema as follows:

create role fix;
create role dcv login password 'mypassword' in role fix;
grant select on all tables on schema xzy to dcv';

I was able to connect to the database without giving 'grant connect on
database db1 to dcv'

My question is when do I have to explicitly give connect grant? How did
user dcv connect to database without the connect privilege?

Thanks

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