I’m trying to build a query where 2 columns from different tables get subtracted. This is what I tried:
DB::connection('lab_inv')->where('tab2'.'Amount_Run', '=', 'tab1'.'Amount')->selectraw('tab1.Amount - tab2.Amount_Run');
The first table has the value ‘Amount’ which is unique for each id, the second table is bound by a foreign key to the id of the first table and has the parameter ‘Amount_Run’ which is also different depending on the id. Amount = Amount – Amount_run. Any Idea what I’m doing wrong.
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If i understood your question correctly, a simple join and then subtract would do the trick:
DB::connection('lab_inv') ->table('tab1') ->join('tab2', 'tab1.id', 'tab2.tab1_id') // replace this with the actual foreign key ->selectraw('tab1.Amount - tab2.Amount_Run AS amount') ->get();