alasql/test/test016.js

AlaSQL.js - JavaScript SQL database library for relational and graph data manipulation with support of localStorage, IndexedDB, and Excel

if(typeof exports === 'object') {
	var assert = require("assert");
	var alasql = require('..');
};

describe('Test 16', function() {
	it('Grouping', function(done){
		alasql('create database test16a');
		alasql('use test16a');
		alasql('create table students (studentid int, studentname string, courseid int, startdate date, amt money, schoolid int)')

		alasql.databases.test16a.tables.students.data = [
			{studentid:58,studentname:'Sarah Patrik',courseid:1, startdate: new Date(2014,0,10), amt:10, schoolid:1},
			{studentid:102,studentname:'John Stewart', courseid:2, startdate: new Date(2014,0,20), amt:20, schoolid:1},
			{studentid:103,studentname:'Joan Blackmore', courseid:2, startdate: new Date(2014,0,20), amt:20, schoolid:1},
			{studentid:104,studentname:'Anna Wooden', courseid:4, startdate: new Date(2014,0,15), amt:30, schoolid:2},
			{studentid:150,studentname:'Astrid Carlson', courseid:7, startdate: new Date(2014,0,15), amt:30, schoolid:1},
		];

		alasql('create table courses (courseid int, coursename string, schoolid int)')
		alasql.databases.test16a.tables.courses.data = [
			{courseid:1, coursename: 'first', schoolid:1},
			{courseid:2, coursename: 'second', schoolid:1},
			{courseid:3, coursename: 'third', schoolid:2},
			{courseid:4, coursename: 'fourth', schoolid:2},
			{courseid:5, coursename: 'fifth', schoolid:2}
		];
		alasql('create table schools (schoolid int, schoolname string, regionid int)');

		alasql.databases.test16a.tables.schools.data = [
			{schoolid:1, schoolname: 'Northern School', regionid:'north'},
			{schoolid:2, schoolname: 'Southern School', regionid:'south'},
			{schoolid:3, schoolname: 'Eastern School', regionid:'east'},
			{schoolid:4, schoolname: 'Western School', regionid:'west'},
		];

		var res = alasql('SELECT students.schoolid, students.courseid, students.studentname '+
	 		' FROM students '+
	 		' LEFT JOIN courses ON students.courseid = courses.courseid AND students.schoolid = courses.schoolid'+
	 		' LEFT JOIN schools ON courses.schoolid = schools.schoolid '+
	 		' GROUP BY students.schoolid, students.courseid, studentname '+
	 		' ORDER BY studentname DESC' );
//if(typeof exports === 'object') console.log(res);
//else console.table(res);
//console.table(res);
		assert.equal(5, res.length);
		assert.equal(1, res[0].courseid);
		assert.equal(2, res[1].courseid);
		assert.equal(2, res[2].courseid);
		assert.equal(7, res[3].courseid);
		assert.equal(4, res[4].courseid);

		alasql('drop database test16a');
		done();
	});
});