If you want to find the location of your log file in Postgres, you'll need to hop into a Psql session.. psql dbname Then it's as simple as running.. show data_directory ; Which will output the data directory, in my case.. /Users/sea...

You can write reusable scripts with Postgres by taking advantage of named variables. A named variable starts with a `:` in your sql script. Here is an example select :a_number You can then use this statement with `psql` and the `--variable` fl...

Unfortunately PHP's PDO constructor doesn't take a database connection url (in a format that Heroku makes available as a config var) as an argument. It has its own, rather odd syntax. However, it's easy enough to extract url parts with the `parse_url`...

Here are a few snippets for cross database queries. It's important to note that you must be explicit in enumerating the columns and types you are querying. Otherwise, things will probably not work as expected. -- enable extension create extension db...

Heroku is awesome! Let's say we want to copy a production database to a staging database. We can use the `pg:backups:restore` command to accomplish this. Here is an example. For the source database we are using the `production-app-name` and for stagi...

When Heroku creates a dump file of your Postgres database it uses the `-Fc` option It is equivalent to running pg_dump -Fc -d name_of_db > name_of_db.dump This command will let you import your database with the `pg_restore` command pg_rest...

The first thing you'll need to do is enable the extension create extension "uuid-ossp"; To test that it's working select uuid_generate_v1(); For more info on which version of the algorithm you should use refer to the documentation. ...

This query and pattern will return urls in text all within a single SQL query. select substring(column_name from '.*://([^/]*)') as domain_name from table_name; And here it is in a larger query, say for retrieving page view counts for referrers. ...

You might have to append the path of the Postgres.app bin directory to your path in order to install the Python driver for Posgres. export PATH=$PATH:/Applications/Postgres.app/Contents/MacOS/bin To find the location of the application try this ...

Let's create a table that will hold some dummy data. > create table fruits (id serial primary key, name varchar, color varchar); > insert into fruits (name, color) values ('apple', 'red'); > insert into fruits (name, color) values ('ap...

If you have an string of numbers like "1,2,3" and you want to turn it into an array of integers you need to cast it into an integer array type. "{1,2,3}"::int[] This is commonly used together when grabbing a set using the ANY clause. sele...