问题
I'm building a small search in my Laravel 7.0
application. I'm having two models Project
and Company
which is into many to many
relationship with project_associate_company
intermediate table.
My tables are Project
******************** projects ***********************
| |
| id | name | area | cost | created_at | updated_at |
| 1 | Development Project | 1461 | 243 |2018-09-17 21:42:41|2018-09-17 21:42:41|
| 2 | Testing Project | 1500 | 200 |2018-09-18 21:42:41|2018-09-18 21:42:41|
Company Model:
******************** companies ***********************
| |
| id | name | state | type | created_at | updated_at |
| 1 | Demo company | Maharastra | Private | ..... | .... |
| 1 | Test company | Gujarat | Public | ..... | .... |
Pivot table (relation) table:
******************** project_associate_company ***************
| |
| id | project_id | company_id | role_id | specialisation_id |
| 1 | 1 | 1 | 1 | 1 |
| 2 | 1 | 1 | 2 | 2 |
| 3 | 2 | 1 | 1 | 1 |
| 4 | 2 | 2 | 1 | 1 |
| 5 | 1 | 2 | 4 | 2 |
|____________________________________________________________|
Now in my controller I'm having:
$companies = Company::join('project_associate_company', function ($join) {
$join->on('companies.id', '=', 'project_associate_company.company_id')
->whereNull('project_associate_company.deleted_at');
})
->join('projects', function ($join) {
$join->on('project_associate_company.project_id', '=', 'projects.id')
->whereNull('projects.deleted_at');
})
->select('companies.*',
DB::raw('count(projects.id) as projects_count'),
DB::raw('count(DISTINCT projects.id) as unique_projects_count'),
DB::raw('SUM( projects.cost) as projects_cost'),
DB::raw('SUM( projects.area) as projects_area')
)
->groupBy('companies.id')
->orderBy('projects_area', 'desc')
->paginate();
Expected results:
| id | name | projects_count | unique_projects_count | projects_area | projects_cost |
| 1 | Demo company | 3 | 2 | 2961 | 443 |
| 1 | Test company | 2 | 2 | 2961 | 443 |
But results generating:
| id | name | projects_count | unique_projects_count | projects_area | projects_cost |
| 1 | Demo company | 3 | 2 | 4422 | 686 |
| 1 | Test company | 2 | 2 | 2961 | 443 |
So whenever I'm joining projects I'm getting duplicate projects which are added multiple during CRUD operation as per role and specialisation. I need to have DISTINCT
projects where I can sum its area and cost, so that I can sort with them. Currently I'm having different projects_count
and unique_projects_count
I tried doing groupBy('companies.id')->groupBy('projects.id')
but the results are coming wrong. How can I achieve this?
回答1:
Update: Another equivalent mysql query would be
SELECT
c.*,
SUM(pc.projects_count) as projects_count,
COUNT(p.id) as unique_projects_count,
SUM(p.cost) as projects_cost,
SUM(p.area) as projects_area
FROM companies c
INNER JOIN (
SELECT company_id, project_id, COUNT(1) AS projects_count
FROM project_associate_company
WHERE deleted_at IS NULL
GROUP BY company_id, project_id
) pc ON c.id = pc.company_id
INNER JOIN projects p ON pc.project_id = p.id
WHERE p.deleted_at IS NULL
GROUP BY c.id;
Old: The equivalent query you're looking for in mysql is
SELECT
id,
`name`,
state,
`type`,
SUM(projects_count) projects_count,
SUM(unique_projects_count) AS unique_projects_count,
SUM(projects_cost) AS projects_cost,
SUM(projects_area) AS projects_area
FROM (
SELECT
c.*,
COUNT(p.id) as projects_count,
COUNT(DISTINCT p.id) as unique_projects_count,
p.cost as projects_cost,
p.area as projects_area
FROM companies c
INNER JOIN project_associate_company pc ON c.id = pc.company_id
INNER JOIN projects p ON pc.project_id = p.id
WHERE pc.deleted_at IS NULL AND p.deleted_at IS NULL
GROUP BY c.id, p.id
) AS tmp
GROUP BY tmp.id
Corresponding laravel query would be
$innerQuery = DB::table('companies as c')
->join('project_associate_company as pc', 'c.id', '=', 'pc.company_id')
->join('projects as p', 'pc.project_id', '=', 'p.id')
->select(DB::raw("c.id,
c.name,
c.state,
c.type,
COUNT(p.id) as projects_count,
COUNT(DISTINCT p.id) as unique_projects_count,
p.cost as projects_cost,
p.area as projects_area"))
->whereNull('pc.deleted_at')
->whereNull('p.deleted_at')
->groupByRaw('c.id, p.id');
$query = DB::query()->fromSub($innerQuery, 't')
->select(DB::raw("
id,
`name`,
state,
`type`,
SUM(projects_count) projects_count,
SUM(unique_projects_count) AS unique_projects_count,
SUM(projects_cost) AS projects_cost,
SUM(projects_area) AS projects_area
"))
->groupBy('t.id')
->paginate()->toArray();
来源:https://stackoverflow.com/questions/64073949/joining-distinct-tables-in-laravel