code: function del() {
      // Make sure tableName is processed by the formatter first.
      var tableName = this.tableName;
      var wheres = this.where();
      var sql = 'delete from ' + tableName + (wheres ? ' ' + wheres : '');
      var returning = this.single.returning;
      return {
       sql: sql + this._returning(returning),
       returning: returning
     };
    }
docs: Compiles a `delete` query.