diff --git a/app/models/section.rb b/app/models/section.rb
index 4d4cadf..116e95f 100644
--- a/app/models/section.rb
+++ b/app/models/section.rb
@@ -63,20 +63,17 @@
 
   def self.update_numbers!(*ids, phase:)
     # Ensure only section ids belonging to this Phase are included.
-    ids    = ids.map(&:to_i) & phase.section_ids
+    ids = ids.map(&:to_i) & phase.section_ids
     return if ids.empty?
-    # Build an Array with each ID and its relative position in the Array
-    values = ids.each_with_index.map { |id, i| "(#{id}, #{i + 1})" }.join(", ")
-    # Run a single UPDATE query for all records.
-    query  = <<~SQL
-      UPDATE #{table_name} \
-        SET number = svals.number \
-        FROM (VALUES #{sanitize_sql(values)}) AS svals(id, number) \
-        WHERE svals.id = #{table_name}.id;
-      SQL
-    connection.execute(query, "Section Update number")
+    case connection.adapter_name
+    when "PostgreSQL" then update_numbers_postgresql!(ids)
+    when "Mysql2"     then update_numbers_mysql2!(ids)
+    else
+      update_numbers_sequentially!(ids)
+    end
   end
 
+
   ##
   # return the title of the section
   #
@@ -108,7 +105,32 @@
   end
 
   private
-    def set_defaults
-      self.modifiable = true if modifiable.nil?
+
+  def self.update_numbers_postgresql!(ids)
+    # Build an Array with each ID and its relative position in the Array
+    values = ids.each_with_index.map { |id, i| "(#{id}, #{i + 1})" }.join(", ")
+    # Run a single UPDATE query for all records.
+    query = <<~SQL
+      UPDATE #{table_name} \
+        SET number = svals.number \
+        FROM (VALUES #{sanitize_sql(values)}) AS svals(id, number) \
+        WHERE svals.id = #{table_name}.id;
+      SQL
+    connection.execute(query)
+  end
+
+  def self.update_numbers_mysql2!(ids)
+    ids_string = ids.map { |id| "'#{id}'" }.join(",")
+    update_all(%Q{ number = FIELD(id, #{sanitize_sql(ids_string)}) })
+  end
+
+  def self.update_numbers_sequentially!(ids)
+    ids.each_with_index.map do |id, number|
+      find(id).update_attribute(:number, number + 1)
     end
+  end
+
+  def set_defaults
+    self.modifiable = true if modifiable.nil?
+  end
 end