Insert into different schema using raw SQL

lib/active_record/connection_adapters/sqlserver/schema_statements.rb

@@ -571,6 +571,7 @@ def column_definitions(table_name)
         end
 
         def column_definitions_sql(database, identifier)
+          database = "TEMPDB" if identifier.temporary_table?
           schema_name = "schema_name()"
 
           if prepared_statements
@@ -581,12 +582,8 @@ def column_definitions_sql(database, identifier)
             schema_name = quote(identifier.schema) if identifier.schema.present?
           end
 
-          object_id_arg = identifier.schema.present? ? "CONCAT(#{schema_name},'.',#{object_name})" : object_name
-
-          if identifier.temporary_table?
-            database = "TEMPDB"
-            object_id_arg = "CONCAT('#{database}','..',#{object_name})"
-          end
+          object_id_arg = identifier.schema.present? ? "CONCAT('.',#{schema_name},'.',#{object_name})" : "CONCAT('..',#{object_name})"
+          object_id_arg = "CONCAT('#{database}',#{object_id_arg})"
 
           %{
             SELECT

test/cases/temp_test_sqlserver.rb

@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+
+require "cases/helper_sqlserver"
+require "models/dog"
+require "models/other_dog"
+
+class TempTestSQLServer < ActiveRecord::TestCase
+  # it "assert true" do
+  #   assert true
+  # end
+
+  it "insert from one schema to another using raw SQL" do
+    arunit_connection = Dog.lease_connection
+    arunit2_connection = OtherDog.lease_connection
+
+    arunit_database = arunit_connection.pool.db_config.database
+    arunit2_database = arunit2_connection.pool.db_config.database
+
+    sql = <<~SQL
+      INSERT INTO #{arunit2_database}.dbo.dogs(id) SELECT id FROM #{arunit_database}.dbo.dogs
+    SQL
+
+    OtherDog.destroy_all
+
+    assert Dog.count, 1
+    assert OtherDog.count, 0
+
+    Dog.transaction do
+      OtherDog.transaction do
+        assert_nothing_raised do
+          arunit_connection.execute(sql)
+        end
+      end
+    end
+
+    assert Dog.count, 1
+    assert OtherDog.count, 1
+  end
+end