example.js

import query from 'sql-js';

const rebels = [
    { name: 'Han',    profession: 'Smuggler', age: 30 },
    { name: 'Luke',   profession: 'Jedi',     age: 32, father: 'Darth Vader' },
    { name: 'Leia',   profession: 'Princess', age: 32 },
    { name: 'Obi',    profession: 'Jedi',     age: 65 },
    { name: 'Chewie', profession: 'Smuggler', age: 30 }
];
const empire = [
    { name: 'Anakin',      profession: 'Jedi',      age: 50 },
    { name: 'Darth Vader', profession: 'Lord Sith', age: 65 },
    { name: 'Lando',       profession: 'Smuggler',  age: 50 }
];

const fatherJoin = (join) => join[0].father === join[1].name;
const isJedi = (join) => join[0].profession === 'Jedi';
const age = (join) => join[0].age;
const older20 = (group) => group[0] > 20;

let resultSet = query()
    .select()
    .from(rebels, empire)
    .where(fatherJoin)
    .where(isJedi)
    .groupBy(age)
    .having(older20)
    .execute();


console.log(JSON.stringify(resultSet));