wiseone :
My Table Structure ---
--
-- Database: `sample`
--
CREATE DATABASE IF NOT EXISTS `sample` DEFAULT CHARACTER SET latin1 COLLATE latin1_swedish_ci;
USE `sample`;
-- --------------------------------------------------------
--
-- Table structure for table `downloads`
--
DROP TABLE IF EXISTS `downloads`;
CREATE TABLE IF NOT EXISTS `downloads` (
`dload_id` int(11) NOT NULL AUTO_INCREMENT,
`wall_id` int(11) NOT NULL,
`dload_date` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
PRIMARY KEY (`dload_id`)
) ENGINE=MyISAM AUTO_INCREMENT=88 DEFAULT CHARSET=latin1;
--
-- Table structure for table `users`
--
DROP TABLE IF EXISTS `users`;
CREATE TABLE IF NOT EXISTS `users` (
`user_id` int(11) NOT NULL AUTO_INCREMENT,
`login` varchar(45) DEFAULT NULL,
`password` varchar(45) DEFAULT NULL,
`folder_id` varchar(45) DEFAULT NULL,
`last_login` varchar(45) DEFAULT NULL,
`status` set('0','1') NOT NULL DEFAULT '1',
PRIMARY KEY (`user_id`),
UNIQUE KEY `folder_id_UNIQUE` (`folder_id`),
UNIQUE KEY `login_UNIQUE` (`login`)
) ENGINE=MyISAM AUTO_INCREMENT=11 DEFAULT CHARSET=latin1;
--
-- Table structure for table `wallpapers`
--
DROP TABLE IF EXISTS `wallpapers`;
CREATE TABLE IF NOT EXISTS `wallpapers` (
`wall_id` int(11) NOT NULL AUTO_INCREMENT,
`user_id` int(11) NOT NULL,
`filename` varchar(100) DEFAULT NULL,
`upload_date` datetime DEFAULT CURRENT_TIMESTAMP,
`status` set('0','1') DEFAULT '',
PRIMARY KEY (`wall_id`)
) ENGINE=MyISAM AUTO_INCREMENT=21 DEFAULT CHARSET=latin1;
- 'users' contain users' login details etc.
- 'wallpapers' contain wallpaper uploaded by user and
- 'download' contains wallpapers downloaded by online users.
SELECT U.user_id, U.login, D.dload_id, W.filename, IFNULL(COUNT(D.dload_id), 0) AS total_downloads
FROM downloads AS D
LEFT JOIN wallpapers AS W ON W.wall_id = D.wall_id
LEFT JOIN users AS U on W.user_id = U.user_id
WHERE D.dload_date BETWEEN '2020-01-01 00:00:00' AND '2020-01-31 00:00:00'
GROUP BY U.user_id, filename
ORDER BY user_id ASC LIMIT 500
above query just returns data for users who's wallpapers have been downloaded but I need to list down all users in my user table whether their wallpapers have been downloaded or not.
Above query's result
-
Expected Result
Thank you
Sample Data
INSERT INTO `downloads` (`dload_id`, `wall_id`, `dload_date`) VALUES
(1, 1, '2020-01-01 00:00:00'),
(2, 7, '2020-01-01 00:00:00'),
(3, 7, '2020-01-01 00:00:00'),
(4, 7, '2020-01-01 00:00:00'),
(5, 6, '2020-01-02 00:00:00'),
(6, 7, '2020-01-02 00:00:00'),
(7, 6, '2020-01-02 00:00:00'),
(8, 6, '2020-01-02 00:00:00'),
(9, 5, '2020-01-02 00:00:00'),
(10, 5, '2020-01-03 00:00:00'),
(11, 5, '2020-01-03 00:00:00'),
(12, 3, '2020-01-03 00:00:00'),
(13, 2, '2020-01-04 00:00:00'),
(14, 1, '2020-01-04 00:00:00'),
(15, 5, '2020-01-04 00:00:00'),
(16, 5, '2020-01-04 00:00:00'),
(17, 3, '2020-01-05 00:00:00'),
(18, 1, '2020-01-06 00:00:00'),
(19, 1, '2020-01-06 00:00:00'),
(20, 6, '2020-01-07 00:00:00'),
(21, 6, '2020-01-08 00:00:00'),
(22, 5, '2020-01-10 00:00:00'),
(23, 5, '2020-01-11 00:00:00'),
(24, 5, '2020-01-11 00:00:00'),
(25, 3, '2020-01-13 00:00:00'),
(26, 2, '2020-01-13 00:00:00'),
(27, 7, '2020-01-15 00:00:00'),
(28, 2, '2020-01-16 00:00:00'),
(29, 3, '2020-01-16 00:00:00'),
(30, 4, '2020-01-16 00:00:00'),
(31, 7, '2020-01-18 00:00:00'),
(32, 7, '2020-01-18 00:00:00'),
(33, 7, '2020-01-20 00:00:00'),
(34, 6, '2020-01-21 00:00:00'),
(35, 7, '2020-01-21 00:00:00'),
(36, 6, '2020-01-21 00:00:00'),
(37, 6, '2020-01-22 00:00:00'),
(38, 5, '2020-01-23 00:00:00'),
(39, 5, '2020-01-24 00:00:00'),
(40, 2, '2020-01-25 00:00:00'),
(41, 3, '2020-01-25 00:00:00'),
(42, 4, '2020-01-26 00:00:00'),
(43, 1, '2020-01-26 00:00:00'),
(44, 2, '2020-01-26 00:00:00'),
(45, 3, '2020-01-28 00:00:00'),
(46, 7, '2020-01-28 00:00:00'),
(47, 7, '2020-01-29 00:00:00'),
(48, 7, '2020-01-29 00:00:00'),
(49, 6, '2020-01-29 00:00:00'),
(50, 7, '2020-01-29 00:00:00'),
(51, 6, '2020-01-29 00:00:00'),
(52, 6, '2020-01-29 00:00:00'),
(53, 5, '2020-01-29 00:00:00'),
(54, 5, '2020-01-29 00:00:00'),
(55, 5, '2020-01-29 00:00:00'),
(56, 3, '2020-02-01 00:00:00'),
(57, 2, '2020-02-01 00:00:00'),
(58, 1, '2020-02-01 00:00:00'),
(59, 5, '2020-02-01 00:00:00'),
(60, 3, '2020-02-02 00:00:00'),
(61, 2, '2020-02-02 00:00:00'),
(62, 1, '2020-02-02 00:00:00'),
(63, 2, '2020-02-02 00:00:00'),
(64, 3, '2020-02-02 00:00:00'),
(65, 4, '2020-02-03 00:00:00'),
(66, 2, '2020-02-03 00:00:00'),
(67, 2, '2020-02-03 00:00:00'),
(68, 5, '2020-02-05 00:00:00'),
(69, 5, '2020-02-05 00:00:00'),
(70, 5, '2020-02-05 00:00:00'),
(71, 5, '2020-02-06 00:00:00'),
(72, 7, '2020-02-06 00:00:00'),
(73, 7, '2020-02-07 00:00:00'),
(74, 7, '2020-02-08 00:00:00'),
(75, 6, '2020-02-09 00:00:00'),
(76, 7, '2020-02-09 00:00:00'),
(77, 6, '2020-02-12 00:00:00'),
(78, 6, '2020-02-12 00:00:00'),
(79, 5, '2020-02-12 00:00:00'),
(80, 5, '2020-02-16 00:00:00'),
(81, 5, '2020-02-16 00:00:00'),
(82, 3, '2020-02-18 00:00:00'),
(83, 2, '2020-02-18 00:00:00'),
(84, 1, '2020-02-20 00:00:00'),
(85, 2, '2020-02-20 00:00:00'),
(86, 3, '2020-02-21 00:00:00'),
(87, 4, '2020-02-21 00:00:00');
INSERT INTO `users` (`user_id`, `login`, `password`, `folder_id`, `last_login`, `status`) VALUES
(1, '[email protected]', '1111', 'A001', NULL, '1'),
(2, '[email protected]', '1111', 'A002', NULL, '1'),
(3, '[email protected]', '1111', 'A003', NULL, '1'),
(4, '[email protected]', '1111', 'A004', NULL, '1'),
(5, '[email protected]', '1111', 'A005', NULL, '1'),
(6, '[email protected]', '1111', 'A006', NULL, '1'),
(7, '[email protected]', '1111', 'A007', NULL, '1'),
(8, '[email protected]', '1111', 'A008', NULL, '1'),
(9, '[email protected]', '1111', 'A009', NULL, '1'),
(10, '[email protected]', '1111', 'A010', NULL, '1');
INSERT INTO `wallpapers` (`wall_id`, `user_id`, `filename`, `upload_date`, `status`) VALUES
(1, 2, 'wallpaper1.jpg', '2020-02-01 00:00:00', '1'),
(2, 1, 'wallpaper2.jpg', '2020-02-01 00:00:00', '1'),
(3, 1, 'wallpaper3.jpg', '2020-02-01 00:00:00', '1'),
(4, 2, 'wallpaper4.jpg', '2020-02-01 00:00:00', '1'),
(5, 3, 'wallpaper5.jpg', '2020-02-01 00:00:00', '1'),
(6, 5, 'wallpaper6.jpg', '2020-02-08 00:00:00', '1'),
(7, 6, 'wallpaper7.jpg', '2020-02-08 00:00:00', '1'),
(8, 5, 'wallpaper8.jpg', '2020-02-08 00:00:00', '1'),
(9, 6, 'wallpaper9.jpg', '2020-02-08 00:00:00', '1'),
(10, 4, 'wallpaper10.jpg', '2020-02-08 00:00:00', '1'),
(11, 6, 'wallpaper11.jpg', '2020-02-09 00:00:00', '1'),
(12, 5, 'wallpaper12.jpg', '2020-02-09 00:00:00', '1'),
(13, 1, 'wallpaper13.jpg', '2020-02-09 00:00:00', '1'),
(14, 4, 'wallpaper14.jpg', '2020-02-10 00:00:00', '1'),
(15, 6, 'wallpaper15.jpg', '2020-02-10 00:00:00', '1'),
(16, 1, 'wallpaper16.jpg', '2020-02-10 00:00:00', '1'),
(17, 2, 'wallpaper17.jpg', '2020-02-13 00:00:00', '1'),
(18, 4, 'wallpaper18.jpg', '2020-02-13 00:00:00', '1'),
(19, 6, 'wallpaper19.jpg', '2020-02-19 00:00:00', '1'),
(20, 1, 'wallpaper20.jpg', '2020-02-19 00:00:00', '1');
Tushar :
Try with this query
SELECT U.user_id, U.login,N.dload_id,N.filename,N.total_downloads
FROM `users` U left join
(
SELECT D.wall_id,W.filename,W.user_id,D.dload_id,count(D.wall_id) as total_downloads
FROM `downloads` D
left join wallpapers W on D.wall_id=W.wall_id
where D.dload_date BETWEEN '2020-01-01 00:00:00' AND '2020-01-31 00:00:00'
GROUP BY D.`wall_id`
) N on U.user_id=N.user_id
Here you need to use subquery. Try this query, hopefully it will be work fine.