我如何获得sys.extended_properties SQL在繁琐的js

我需要使用Tedius.js获取SQL Server 2008中的列的描述，但是当我运行查询时会抛出下一条消息：

 events.js:182 throw er; // Unhandled 'error' event Error: Unknown type: 0 

这是代码：

 function executeStatement() { var query = `select sc.name as colum, sep.value as description from sys.tables st inner join sys.columns sc on st.object_id = sc.object_id left join sys.extended_properties sep on st.object_id = sep.major_id` request = new Request(query, function(err, rowCount) { if (err) { console.log(err); } else { console.log(rowCount + ' rows'); } }); request.on('row', function(columns) { columns.forEach(function(column) { console.log(column); }); }); connection.execSql(request); }