问题
i want to count projects status updates/changes for a given month by categories names
I have a categories (list of category), investment (list of investors investments including category_id from categories), status table which has a name with pre implementation, implementation and operations states. a project contains project id, name, start date fields. both status and projects have a many to many relationship called project_status table contains project_id, status_id, date_of_progress.
I want to count all projects within this month who has update/change their status_id by categories names
from pre-implementation to implementations from implementations to operations from pre-implementation to operations
CREATE TABLE `categories` (
`cat_id` int(11) NOT NULL,
`name` varchar(50) NOT NULL,
`description` varchar(255) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
INSERT INTO `categories` (`cat_id`, `name`, `description`) VALUES
(1, 'agriculture', ''),
(2, 'manufactures ', ''),
(3, 'Technology', ''),
(4, 'services', '');
CREATE TABLE `investments` (
`investment_id` int(11) NOT NULL,
`investment_name` varchar(100) NOT NULL,
`cat_id` int(11) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
INSERT INTO `investments` (`investment_id`, `investment_name`, `cat_id`) VALUES
(1, 'Company A', 3),
(2, 'Company B', 4),
(3, 'Company C', 1),
(4, 'Company D', 2),
(5, 'Company E', 3),
(6, 'Company F', 4),
(7, 'Company G', 1),
(8, 'Company H', 2);
CREATE TABLE `status` (
`status_id` int(11) NOT NULL,
`status_name` varchar(30) NOT NULL,
`description` varchar(255) DEFAULT NULL,
`status_name_tg` varchar(50) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
INSERT INTO `status` (`status_id`, `status_name`, `description`, `status_name_tg`) VALUES
(1, 'Pre Implementation', 'Operational', 'Pre Implementation'),
(2, 'Implementation', NULL, 'Implementation'),
(3, 'Operational', NULL, 'Operational'),
(4, 'Inactive', NULL, 'Inactive'),
(5, 'Cancellation', NULL, 'Cancellation');
CREATE TABLE `project_status` (
`project_status_id` int(11) NOT NULL,
`status_id` int(11) NOT NULL,
`time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP,
`project_id` int(11) NOT NULL,
`reason_for_cancellation` varchar(255) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
INSERT INTO `project_status` (`project_status_id`, `status_id`, `time`, `project_id`, `reason_for_cancellation`) VALUES
(1, 1, '2019-02-24 21:51:50', 1, NULL),
(2, 2, '2019-03-26 21:52:57', 1, NULL),
(3, 1, '2019-04-30 21:57:57', 2, NULL),
(4, 1, '2019-05-26 22:04:08', 3, NULL),
(5, 3, '2019-08-24 22:06:36', 1, NULL),
(6, 2, '2019-08-11 22:07:05', 3, NULL),
(8, 1, '2019-08-01 00:14:41', 6, NULL),
(9, 1, '2019-08-09 12:11:22', 7, NULL),
(10, 1, '2019-08-09 12:15:22', 8, NULL),
(11, 3, '2019-08-14 10:07:49', 7, NULL),
(12, 2, '2019-08-14 10:10:45', 8, NULL),
(13, 2, '2019-08-26 17:16:02', 6, NULL),
(14, 3, '2019-08-26 17:16:02', 6, NULL);
CREATE TABLE `projects` (
`project_id` int(11) NOT NULL,
`name` varchar(150) NOT NULL,
`start_date` datetime NOT NULL,
`investment_id` int(11) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
INSERT INTO `projects` (`project_id`, `name`, `start_date`, `investment_id`) VALUES
(1, 'site A', '2019-02-01 00:00:00', 1),
(2, 'site B', '2019-03-12 00:00:00', 2),
(3, 'Site C', '2019-04-04 00:00:00', 3),
(4, 'Site D', '2019-05-03 00:00:00', 4),
(5, 'site E', '2019-06-01 00:00:00', 5),
(6, 'site F', '2019-08-02 00:00:00', 6),
(7, 'Site J', '2019-08-01 00:00:00', 7),
(8, 'Site H', '2019-08-05 00:00:00', 8);
Below is the result of Augus 2019
+--------------+-------------------+---------------+---------------+
| category_name| pre_implemntation | imp_operation | pre_operation |
+------+-------+------------+-------------++-------------++--------+
| agriculture | 1 | - | 1 |
| manufactures | 1 | - | - |
| Technology | - | 1 | - |
| services | - | 1 | - |
+--------------+-------------------+---------------+---------------+
回答1:
SQL DEMO
SELECT q.year
, q.month
, q.name
, COUNT(CASE WHEN q.last_status = 2 THEN 1 END) as pre_implementation
, COUNT(CASE WHEN q.last_status = 3
AND q.previous_status = 2 THEN 1 END) as implementation_operation
, COUNT(CASE WHEN q.last_status = 3
AND (q.previous_status = 1 or q.previous_status IS NULL)
THEN 1 END) as pre_operation
FROM (
SELECT *, (SELECT MAX(p.status_id)
FROM project_status p
WHERE p.time < CONCAT(t.year,'/', t.month,'/1')
AND p.project_id = t.project_id
) as previous_status
FROM (
SELECT YEAR(time) as year
, MONTH(time) as month
, c.name
, ps.project_id
, MAX(status_id) as last_status
FROM project_status ps
JOIN projects p
ON ps.project_id = p. project_id
JOIN investments i
ON p.investment_id = i.investment_id
JOIN categories c
ON i.cat_id = c.cat_id
GROUP BY YEAR(time), MONTH(time), c.name, ps.project_id
) t
) q
GROUP BY q.year, q.month, q.name
OUTPUT
+--------+-------+---------------+--------------------+--------------------------+---------------+
| year | month | name | pre_implementation | implementation_operation | pre_operation |
+--------+-------+---------------+--------------------+--------------------------+---------------+
| 2019 | 2 | Technology | 0 | 0 | 0 |
| 2019 | 3 | Technology | 1 | 0 | 0 |
| 2019 | 4 | services | 0 | 0 | 0 |
| 2019 | 5 | agriculture | 0 | 0 | 0 |
+--------+-------+---------------+--------------------+--------------------------+---------------+
| 2019 | 8 | Technology | 0 | 1 | 0 |
| 2019 | 8 | agriculture | 1 | 0 | 1 |
| 2019 | 8 | services | 0 | 0 | 1 |
| 2019 | 8 | manufactures | 1 | 0 | 0 |
+--------+-------+---------------+--------------------+--------------------------+---------------+
来源：https://stackoverflow.com/questions/57800331/how-can-i-count-status-changed-updated-by-categories-for-a-specific-month