sql addition of 2 queries return NULL -

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I want to add the sum of the two questions (please see the questions given below, this example works) My problem When a question returns an empty result like 

  (Select the amount (60 + 3 + 25 + 2)) + (Select the amount (0)) montant In addition,   
 Additionally, the result of the result is automatically the tap. 
 But when there are more results than the tap of 2 questions: choose  
  (select amount (60 + 3 + 25 + 2) + + (select amount (300 + 50) ) As the montant   
 works in addition and I get the right result:  
 Here is the query that gives me 90 as a result  
  lf.idFraisForfait = f.id on joining the fichefrais FF on the selected amount (lf.quantite) fraisforfait joining the f lignefraisforfait lf ff.idVisiteur = LF .IDVisiteur and ff.mois = lf.mo Is where lf.idVisiteur = "a131" and lf.mois = "201312"   
 This is the second result which gives me 0 results  
  select Lignefraishorsforfait LFH inner yoga ff.idVisiteur = lfh.idVisiteur and ff.mois = lfh.mois where ff.idVisiteur = "a131" and joining fichefrais FF at FF (lfh.montant). Mois = "201312"   
 Here are two questions to add which gives me a tap result, but I hope that 90:  
  select (select (lf.quantite) fraisforfait Join lignefraisforfait louf on the internal from f lf.idFraisForfait = f.id inner ff.i DVisiteur = lf.idVisiteur and ff.mois = lf.mois where lf.idVisiteur = "a131" and lf.mois = "201,401") + joining fichefrais FF (from lignefraishorsforfait LFH inner ff.idVisiteur = lfh.idVisiteur And select fichefrais ff joining ff.mois = lfh.mois (lfh.montant) where ff.idVisiteur = "a131" and ff.mois = "201,401") as montantValide;   
 Does anyone have a solution to this problem? Thanks for your time.   
 
 
 You need to add something that your  NULL  a  0 .  
  Select Collages (Yoga (LFH Montantent), 0)

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