c# - 使用c#在sql查询中的Datediff

Question

我有这个 c# 代码，其中有一个我想在 datagridview 中显示的查询：

   string select = "SELECT E.employeeNumber AS 'Employee Number',
    E.employeePrivateName +' '+E.employeeFamilyName AS 'Employee_Name',
    DATEDIFF (MONTH,E.startWorkingDate, GETDATE()) AS 'Seniority in
    Month'
    FROM TblEmployee E " ;
       Connection c = new Connection();
            SqlDataAdapter dataAdapter = new SqlDataAdapter(select, c.con); //c.con is the      connection string
            SqlCommandBuilder commandBuilder = new SqlCommandBuilder(dataAdapter);


            DataSet ds = new DataSet();
            dataAdapter.Fill(ds);
            dataGridView1.ReadOnly = true;
            dataGridView1.DataSource = ds.Tables[0];

问题在于datediff，因为我在 datagridview 中呈现的查询结果是空的。

谢谢。