php - Running “exists” queries in Laravel query builder -


i'm trying execute :

select * `lms_test`  not exists     (select * `lms_studenttest`      `lms_test`.slug = `lms_studenttest`.testid      , `lms_studenttest`.`studentid`='10a75c804b8851520993dedc42334c0f'     )  , `lms_test`.`testtype`= 'practice test'

but not getting success.
me this.

i think can try example :

a::wherenotexists(function($query){   $query->select(db::raw(1))         ->from('b')         ->whereraw('a.id = b.id');   })  ->get();

or

db::table('lms_test')         ->wherenotexists(function ($query) {             $query->select('lms_studenttest.*')                   ->from('lms_studenttest')                   ->where('lms_test.testtype', 'practice test')                   ->where('lms_studenttest.studentid', '10a75c804b8851520993dedc42334c0f')                   ->whereraw('lms_studenttest.testid = lms_test.slug');         })         ->get();

hope !!!


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