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Laravel Framework MCQs

Which of the following is the correct sample code to union two queries?

$first = DB::table('contacts') ->whereNull('first_name'); $contacts = DB::table('contacts') ->whereNull('last_name') ->get() ->union($first);

$first = DB::table('contacts') ->whereNull('first_name'); $contacts = DB::table('contacts') ->whereNull('last_name') ->get(); $union = DB::union($first,$contacts );

$first = DB::table('contacts') ->union($contacts) ->whereNull('first_name'); $contacts = DB::table('contacts') ->whereNull('last_name') ->union($first) ->get();

$first = DB::table('contacts') ->whereNull('first_name'); $contacts = DB::table('contacts') ->whereNull('last_name') ->union($first) ->get();

Answer

Correct Answer: $first = DB::table('contacts') ->whereNull('first_name'); $contacts = DB::table('contacts') ->whereNull('last_name') ->union($first) ->get();

Explanation:

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