Please click here for sample tables and description.
I have three tables ‘PROJECTS’, 'PROJECTMANAGER' and ‘MANAGERS' as per attached images.
I need a query which can list PROJECTS managed by “PRODUCT” type managers grouped with PROJECT STATUS. If STATUS=2 then show as Completed Projects or else In Progress Projects.
Resulted table should look like as shown in attached image. Desired Result: http://www.dbasupport.com/forums/attachment.php?attachmentid=588&d=1336691473
The query, I need should be generic so that it can be used in any database (MySQL/Oracle/MSSQL/DB2)
Please Help.
BTW, This is not the homework...!!!! I used sample tables.
I have tried with case when statements but don't know how to join and at the same time use group by.
CREATE TABLE PROJECTS
(
PROJECT_ID varchar(20),
PROJECT_NAME varchar(30),
STATUS int
);
CREATE TABLE PROJECTMANAGER
(
PROJECT_ID varchar(20),
MANAGER_ID varchar(20)
);
CREATE TABLE MANAGERS
(
MANAGER_ID varchar(20),
MANAGER_NAME varchar(20),
TYPE varchar(20)
);
INSERT INTO PROJECTS (PROJECT_ID, PROJECT_NAME, STATUS) VALUES
('project_001', 'Project 001', 0),
('project_002', 'Project 002', 1),
('project_003', 'Project 003', 2),
('project_004', 'Project 004', 0),
('project_005', 'Project 005', 2),
('project_006', 'Project 006', 0),
('project_007', 'Project 007', 1);
INSERT INTO PROJECTMANAGER (PROJECT_ID , MANAGER_ID) VALUES
('project_001', 'mgr_001'),
('project_002', 'mgr_001'),
('project_001', 'mgr_002'),
('project_002', 'mgr_003'),
('project_001', 'mgr_003'),
('project_005', 'mgr_001'),
('project_004', 'mgr_002');
INSERT INTO MANAGERS (MANAGER_ID, MANAGER_NAME, TYPE) VALUES
('mgr_001', 'Manager 001', 'PRODUCT'),
('mgr_002', 'Manager 002', 'HR'),
('mgr_003', 'Manager 003', 'PRODUCT'),
('mgr_004', 'Manager 004', 'FINANCE'),
('mgr_005', 'Manager 005', 'PRODUCT');
Resulted Table:
MANAGER_ID | MANAGER _NAME | COMPLETED_PROJECTS | IN_PROGRESS_PROJECTS |
mgr_001 | Manager 001 | 1 | 2 |
mgr_003 | Manager 003 | 0 | 1 |
mgr_005 | Manager 005 | 0 | 0 |
Try something like this:
SELECT
m.manager_id,
m.manager_name,
SUM(CASE WHEN p.status = 2 THEN 1 ELSE 0 END) as completed,
SUM(CASE WHEN p.status != 2 THEN 1 ELSE 0 END) as in_progress
FROM managers m
LEFT JOIN projectmanager pm ON (m.manager_id = pm.manager_id)
LEFT JOIN projects p ON (p.project_id = pm.project_id)
WHERE m.type = 'product'
GROUP BY m.manager_id