[BeginnerQuestion]Why these is 6 rows in my SELECT statement?

| LogicalLauncherMain | Activity| BgWriterHibernate Activity| CheckpointerMain Activity| WalWriterMain (6 rows) As you can see, the third row is empty,but I don't know why. Can anyone provide some solution to me? Thanks in advance! Yours, BeginnerC.

[Beginner Querstion]Where can I find the news of database?

nt to seek more) Thanks in advance! Yours, BeginnerC.

Why password authentication failed for user "postgres"?

Hello everyone, I am a newbie to the postgres,when I use the psql to connect to the postgres,a error message printed: These command list like this: psql -U postgres Password for user postgres:postgres *postgreSQL: password authentication failed for user "postgres"* * * How to solve this problem

Where is the best place to read for the paper around database?

Hello everyone, I am a student who are interest in database,can anyone recommend a website where can read and download the papers around database? Thanks in advance! Best wishes, Wen Yi.

A simple question: Why 'pg_ctl: command not found...' ?

Hello everyone, When I start to learn the 'pg_ctl', the bash echo 'pg_ctl: command not found...' and then print 'Install package 'postgresql-server' to provide command 'pg_ctl'? [N/y]' I am confused because I had already install the PostgreSQL correctly just follow the postgres Document,to prove