alasql/test/test019.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 19', function() {
	it('EXISTS and NOT EXISTS', function(done){
	var db = new alasql.Database("db");
		db.exec('CREATE TABLE test1 (a int)');
		db.exec('INSERT INTO test1 VALUES (1)');
		db.exec('INSERT INTO test1 VALUES (2)');
		db.exec('INSERT INTO test1 VALUES (3)');
		db.exec('INSERT INTO test1 VALUES (4)');
		db.exec('INSERT INTO test1 VALUES (5)');
		db.exec('INSERT INTO test1 VALUES (6)');


		db.exec('CREATE TABLE test2 (a int, b int)');
		db.exec('INSERT INTO test2 VALUES (1, 1)');
		db.exec('INSERT INTO test2 VALUES (1, 2)');
		db.exec('INSERT INTO test2 VALUES (1, 3)');
		db.exec('INSERT INTO test2 VALUES (2, 4)');

		var res = db.exec('SELECT COLUMN a FROM test1 WHERE EXISTS '+
			'(SELECT * FROM test2 WHERE test1.a = test2.b)');
		assert.deepEqual(res, [1,2,3,4]);

		var res = db.exec('SELECT COLUMN a FROM test1 WHERE NOT EXISTS '+
			'(SELECT * FROM test2 WHERE test1.a = test2.a)');
		assert.deepEqual(res, [3,4,5,6]);
		done();
	});
});