Hello , i have got a problem like i am a student but i have limit operations and have to buy subscription , i dont know how to fix it 

i have signed up for a normal account and i needed to set up a student account. how do i do this as i have already done complete work on here and i dont want to lose it.

Hi I added an academic account after using a trial version then realising I was eligible. I joined the accounts together as a team to get my model, I have now closed my trial account, but my student account still shows as a trial version, please help

A couple of days ago I used the sql generator and the comments were associated without problems. However, today I try to generate the Oracle SQL of my model and it does not add any comments to the objects. My account is free for the moment. I would appreciate your quick response and attention. Greetings.

I have install postgres database version 9.6 , 10  on OS Centos 7 64 bit. trying to taken backup with this command

-bash-4.2$ pg_dump -h localhost -Fc backupdb > /var/lib/pgsql/niger_pgbackup/nigerpg_bkp.sql.

but problem is the backup file size had zero . I have tried many time. Kindly help where i have wrong.

-bash-4.2$ pg_dump -h localhost -Fc backupdb > /var/lib/pgsql/niger_pgbackup/nig erpg_bkp.sql
-bash-4.2$ cd niger_pgbackup/
-bash-4.2$ ls -ltr
total 0
-rwxrwxrwx 1 postgres postgres 0 Oct 7 23:38 nigerpg_bkp.sql

Regards

Niger

Apology if this is too basic, but I'm really new to everything and struggling.

So I know how to make a foreign key 

: When there are 2 entities, A and B, you draw a reference from A to B and voila,

the primary keys of A are shown in the B entity boxes as foreign keys, with some names like "A_id".

But when I actually check the SQL preview of B, I don't see any such information as that this data is coming from A.

Am I missing something? How can I make a SQL code like below show up?

PRIMARY KEY (sid, cid), FOREIGN KEY (sid) REFERENCES Students