In SQL Server only the first column added should have the ADD keyword

lib/active_record/connection_adapters/sqlserver/schema_statements.rb

@@ -256,6 +256,13 @@ def type_to_sql(type, limit: nil, precision: nil, scale: nil, **)
           end
         end
 
+        # In SQL Server only the first column added should have the `ADD` keyword.
+        def add_timestamps(table_name, **options)
+          fragments = add_timestamps_for_alter(table_name, **options)
+          fragments[1..].each { |fragment| fragment.sub!('ADD ', '') }
+          execute "ALTER TABLE #{quote_table_name(table_name)} #{fragments.join(', ')}"
+        end
+
         def columns_for_distinct(columns, orders)
           order_columns = orders.reject(&:blank?).map { |s|
                             s = s.to_sql unless s.is_a?(String)

test/cases/coerced_tests.rb

@@ -513,7 +513,7 @@ def test_distinct_count_all_with_custom_select_and_order_coerced
 
   # Leave it up to users to format selects/functions so HAVING works correctly.
   coerce_tests! :test_having_with_strong_parameters
-  
+
   # SELECT columns must be in the GROUP clause. Since since `ids` only selects the primary key you cannot perform this query in SQL Server.
   coerce_tests! :test_ids_with_includes_and_non_primary_key_order
 end