bfcoder

Steps to install and run PostgreSQL 9.2 using Homebrew (Mac OS X)
(if you aren't using version 9.1.5, change line 6 with the correct version)

1. launchctl unload -w ~/Library/LaunchAgents/homebrew.mxcl.postgresql.plist
2. mv /usr/local/var/postgres /usr/local/var/postgres91
3. brew update
4. brew upgrade postgresql
5. initdb /usr/local/var/postgres -E utf8
6. pg_upgrade -b /usr/local/Cellar/postgresql/9.1.5/bin -B /usr/local/Cellar/postgresql/9.2.0/bin -d /usr/local/var/postgres91 -D /usr/local/var/postgres
7. cp /usr/local/Cellar/postgresql/9.2.0/homebrew.mxcl.postgresql.plist ~/Library/LaunchAgents/

bfcoder

// To run:
// npm install globby
// node prepend-use-strict.js

var globby = require('globby');
var fs = require('fs');

globby('**/*.js', function(err, files) {
    for (var i = 0, m = files.length; i < m; i++) {
        var fileContent = fs.readFileSync(files[i]).toString();

bfcoder

/* will return null::json on empty resultset */
SELECT array_to_json(array_agg(row_to_json(t))) FROM t; 

/*
  will return '[]' on empty resultset,
  null::json seems to be managed the same way than sql NULL by COALESCE()
*/
SELECT COALESCE(array_to_json(array_agg(row_to_json(t))), '[]') FROM t;