alasql/test/test113.js

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

//
// tselect01.js
// Test for select
//

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


describe('Test 113 - SELECT ', function(){

	it('prepare database', function(done){
		alasql('create database test113');
		alasql('use database test113');
	//	alasql('show database');
	//	alasql.use('test113');
	//	console.log(alasql.currentDatabase.databaseid);
	// Prepare data for test

		alasql.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.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.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'},
		]};

	//	console.log(Object.keys(alasql.tables));
		done();
	});

//	console.log(Object.keys(alasql.currentDatabase.sqlcache).length);
	it('Select COUNT(*) on cross-join', function(done) {
		assert.equal(25, alasql('select value count(*) from courses, students'));
		done();		
	});

//	console.log(alasql.tables.students.data.length);
//	console.log(Object.keys(alasql.currentDatabase.sqlcache));

//	console.log(Object.keys(alasql.currentDatabase.sqlcache).length);

	it('Select COUNT(*) on right-join', function(done) {
		var res = alasql.exec('SELECT courses.courseid, COUNT(students.studentid) AS cnt \
			FROM students \
			RIGHT JOIN courses USING courseid \
			GROUP BY courses.courseid \
			ORDER BY courseid' );
//		console.log(res);
		assert.deepEqual(res,
			[ { courseid: 1, cnt: 1 },
  			{ courseid: 2, cnt: 2 },
  			{ courseid: 3, cnt: 0 },
  			{ courseid: 4, cnt: 1 },
  			{ courseid: 5, cnt: 0 } ]
		);
		done();		
	});


	it('Select on two left-join', function(done) {
		var res = alasql.exec('SELECT * '+
	 		' FROM students '+
	 		' LEFT JOIN courses ON students.courseid = courses.courseid AND students.schoolid = courses.schoolid'+
	 		' LEFT JOIN schools ON students.schoolid = schools.schoolid '+
	 		' GROUP BY schoolid, courseid, studentname '+
	 		' ORDER BY studentname DESC' );
//		console.table(res);
		assert.equal(5, res.length);
		assert.equal(2, res[4].schoolid);
		done();
	});

	it('Select on one inner-join/1', function(done) {
		var res = alasql.exec('SELECT students.schoolid '+
			' FROM students '+
			' JOIN courses USING courseid');
		assert.equal(4, res.length);
		done();
	});

	it('Select on one inner-join/2', function(done) {
		var res = alasql('SELECT students.schoolid '+
			' FROM students '+
			' INNER JOIN courses USING courseid');

		assert.equal(4, res.length);
		done();
	});

	it('Select on one left-join', function(done) {
		var res = alasql('SELECT students.schoolid '+
			' FROM students '+
			' LEFT JOIN courses USING courseid');

		assert.equal(5, res.length);
		done();
	});

	it('Select on one right-join', function(done) {
		var res = alasql('SELECT students.schoolid '+
			' FROM students '+
			' RIGHT JOIN courses USING courseid');

		assert.equal(6, res.length);
		alasql('drop database test113');
		done();
	});


});