Laravel Eloquent 加入表后不工作的地方

Question

Hi I have written a little query which doesnt seem to working when I use Eloquent but works when I write something similar in MySQL. Data isnt being retuned which shouldnt be due to my where clauses.

I have written this query which isnt working as expected -

$invoices = Invoice::leftJoin('user_details', 'invoices.user_id', 'user_details.user_id')
    ->where('invoices.practice_id', '!=', 'user_details.practice_id')
    ->first();

It is returning data where the invoice.practice_id = user_details.practice_id

I altered the query to prove it isnt working -

$invoices = Invoice::select('invoices.practice_id', 'user_details.practice_id')
    ->leftJoin('user_details', 'invoices.user_id', 'user_details.user_id')
    ->where('invoices.practice_id', '!=', 'user_details.practice_id')
    ->first();

The values returned the practice_id is 6, 6 which shouldnt be possible due to the following where clause where('invoices.practice_id', '!=', 'user_details.practice_id')

Have I done something wrong which I am just not seeing?

Thank you for any help you can provide!

UPDATE

Here is the DB schema for the invoice table

Here is the the DB schema fro the user_details table

The expected result is mentioned above, no results should be returned if invoice_practice_id = user_details.practice_id

Answer 1

@Luke Rayner

Try by rewriting line ->leftJoin('user_details', 'invoices.user_id', 'user_details.user_id')

to

->leftJoin('user_details', 'invoices.user_id', '=', 'user_details.user_id')

If not try to print Last query and post it