mysql - 将 Select 语句转换为另一个 select To Eloquant

Question

如何将这样的 SQL 查询转换为 Eloquent 或 QueryBuilder :

SELECT * FROM studies
where studies.id in(SELECT study_id FROM (
SELECT max(studies.end_date), studies.id as study_id
from  workers inner join resumes on workers.id=resumes.worker_id
inner join studies on resumes.id=studies.resume_id where
resumes.title="main" group by workers.id) as SQ2

或全局

例如，我们如何从其他带有 eloquant 的 select 语句中进行选择:

SELECT a.id from (SELECT * FROM A INNER JOIN B ON a.id=b.id where a.id > 10) as SUBQ1

Answer 1

我认为您当前的查询在所有情况下都没有获得最大结束日期的 study_id，您可以试试这个:

SELECT * FROM studies
where studies.end_date in (
SELECT max(studies.end_date)
from  workers inner join resumes on workers.id=resumes.worker_id
inner join studies on resumes.id=studies.resume_id where
resumes.title="main" group by workers.id) 

如果你想用 laravel Eloquant 实现它，你可以这样做:

$result = DB::table('studies')
    ->select("*")
    ->whereIn('end_date', function($query){
    $query->selectRaw("max(studies.end_date) as max_date")
    ->from('workers')
    ->join('resumes', 'workers.id', '=', 'resumes.worker_id')
    ->join('studies', 'resumes.id', '=', 'studies.resume_id')
    ->where('resumes.title', '=', 'main')
    ->groupBy('workers.id');
    })
    ->get();

foreach($result as $row) {
        print_r($row);
    }