text: -- attach.test
  -- 
  -- execsql {
  --     ATTACH DATABASE 'test2.db' AS db2;
  --     INSERT INTO db2.t3 VALUES(13,14);
  --     SELECT * FROM db2.t4 UNION ALL SELECT * FROM main.t4;
  -- }
  ATTACH DATABASE 'test2.db' AS db2;
  INSERT INTO db2.t3 VALUES(13,14);
  SELECT * FROM db2.t4 UNION ALL SELECT * FROM main.t4;