Can you give me an idea of what this line of code is saying?

Can you tell me about this line of code:

$this_day_video_earn = $db->rawQuery("SELECT SUM(amount - admin_com) AS sum FROM ".T_VIDEOS_TRSNS." c WHERE `time` >= ".$day_start." AND `time` <= ".$day_end." AND user_id = ".$pt->user->id);

PHP:

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