exports.up = function(knex) {
  return knex.schema
    .table('da', async function (table) {
      table.dropColumn('db_employeeID');
      table.dropColumn('getStartTime');
      table.dropColumn('getEndTime');
      table.dropColumn('getStationCode');
    })

};

exports.down = function(knex) {
  return knex.schema
    .table('da', async function (table) {
      table.string('db_employeeID', 255);
      table.string('getStartTime', 255);
      table.string('getEndTime', 255);
      table.string('getStationCode', 255);
    })
};