Questions tagged [postgresql]
PostgreSQL is an open-source, relational database management system (RDBMS) available for all major platforms, including Linux, UNIX, Windows and OS X. Mention your version of Postgres when asking questions. Consider dba.stackexchange.com for questions concerning the administration or advanced features.
postgresql
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How to show tables in PostgreSQL?
What's the equivalent to show tables (from MySQL) in PostgreSQL?
- 270k
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25
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PostgreSQL "DESCRIBE TABLE"
How do you perform the equivalent of Oracle's DESCRIBE TABLE in PostgreSQL with psql command?
- 23.3k
2022
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21
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Select first row in each GROUP BY group?
I'd like to select the first row of each set of rows grouped with a GROUP BY.
Specifically, if I've got a purchases table that looks like this:
SELECT * FROM purchases;
My Output:
id
customer
total
...
- 153k
1967
votes
7
answers
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How to exit from PostgreSQL command line utility: psql
What command or short key can I use to exit the PostgreSQL command line utility psql?
- 22k
1891
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31
answers
2.8m
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How can I change a PostgreSQL user password?
How do I change the password for a PostgreSQL user?
- 27.9k
1654
votes
34
answers
1.4m
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How can I drop all the tables in a PostgreSQL database?
How can I drop all tables in PostgreSQL, working from the command line?
I don't want to drop the database itself, just all tables and all the data in them.
- 92.7k
1542
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16
answers
1.2m
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How to switch databases in psql?
In MySQL, I used use database_name;
What's the psql equivalent?
- 265k
1363
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24
answers
1.1m
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Which version of PostgreSQL am I running?
I'm in a corporate environment (running Debian Linux) and didn't install it myself. I access the databases using Navicat or phpPgAdmin (if that helps). I also don't have shell access to the server ...
- 39.5k
1216
votes
28
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1.2m
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Getting error: Peer authentication failed for user "postgres", when trying to get pgsql working with rails
I'm getting the error:
FATAL: Peer authentication failed for user "postgres"
when I try to make postgres work with Rails.
Here's my pg_hba.conf, my database.yml, and a dump of the full trace.
I ...
- 12.5k
1187
votes
38
answers
1.3m
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How can I start PostgreSQL server on Mac OS X?
Final update:
I had forgotten to run the initdb command.
By running this command
ps auxwww | grep postgres
I see that postgres is not running
> ps auxwww | grep postgres
remcat 1789 0....
1127
votes
21
answers
956k
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Save PL/pgSQL output from PostgreSQL to a CSV file
What is the easiest way to save PL/pgSQL output from a PostgreSQL database to a CSV file?
I'm using PostgreSQL 8.4 with pgAdmin III and PSQL plugin where I run queries from.
- 39.4k
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18
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PostgreSQL error: Fatal: role "username" does not exist
I'm setting up my PostgreSQL 9.1. I can't do anything with PostgreSQL: can't createdb, can't createuser; all operations return the error message
Fatal: role h9uest does not exist
h9uest is my ...
- 11.4k
1031
votes
13
answers
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Difference between text and varchar (character varying)
What's the difference between the text data type and the character varying (varchar) data types?
According to the documentation
If character varying is used without length specifier, the type ...
- 134k
1020
votes
25
answers
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psql: FATAL: database "<user>" does not exist
I'm using Postgres.app for Mac. I've used it in the past on other machines but it's giving me some trouble when installing on my MacBook. I've installed the application and I ran:
psql -h localhost
...
- 12k
992
votes
51
answers
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Can't find the 'libpq-fe.h header when trying to install pg gem
I am using the Ruby on Rails 3.1 pre version. I like to use PostgreSQL, but the problem is installing the pg gem. It gives me the following error:
$ gem install pg
Building native extensions. This ...
- 11.4k