diff --git a/app/controllers/managements_controller.rb b/app/controllers/managements_controller.rb
index 13f408c2..822c5fdf 100644
--- a/app/controllers/managements_controller.rb
+++ b/app/controllers/managements_controller.rb
@@ -1216,9 +1216,9 @@ end
     @partner = Partner.find partner_id
     @customers = @partner.customers
     if @customers.present?
-      @schools = School.where("(partner_id != ? or partner_id is NULL) and (customer_id is NULL or customer_id not in(#{@customers.map(&:id).join(",")}))", @partner.id)
+      @schools = School.where("(partner_id != ? or partner_id is NULL) and customer_id is NULL", @partner.id)
     else
-      @schools = School.where("partner_id != ? or partner_id is NULL", @partner.id)
+      @schools = School.where("customer_id is null and (partner_id != ? or partner_id is NULL)", @partner.id)
     end
     if params[:search]
       @schools = @schools.where("name like ?", "%#{@search}%")