title: Select where Unknown multiple columns have a False value
body: <p>With an allergies table <br>
     <code>| Recipes_id| is_dairy| is_nuts| is_meat| etc.|  etc.| etc.| 
   +-----------+---------+--------+--------+-----+------+-----+</code><br>
  The user specifies only the things he doesn't want to have in it's recipe, e.g without nuts and dairy.<br> Is there a way in mysql(8.0.1) to query without a predefined length of parameters? <br>e.g <code>select from allergies where a = false and b = false and c = false</code><br> where the length (here a,b,c = 3) isn't known ahead?<br> I'm using flask as my backend engine<br>
  Just for clarification, the number of variables is not predefined, e.g it can be 3 columns in one query, and 5 in the other (the number of columns need to be false).</p>