不明确的列名？

Question

好的，所以..我真的找不到问题所以我在这里发帖。 P.S。我是 MSSQL 的新手，所以请保持温柔 xD

我得到的列名不明确 "Name"

我有两个表：Cardiology 和 Cardio_Schedule。我想 select 两者中的一些列并将它们作为结果显示在 gridview 中。我已经查询了..是这样的:

string str = @"
SELECT Cardiology.CID,
       Cardiology.Name,
       Cardiology.Designation,
       Cardiology.Qualification,
       Cardiology.Shift,
       Cardiology.Appointment_Timings,
       Cardio_schedule.Ward_rounds,
       Cardio_schedule.Slot1,
       Cardio_schedule.Slot2,
       Cardio_schedule.Slot3,
       Cardio_schedule.Slot4,
       Cardio_schedule.BreakTime,
       Cardio_schedule.Slot5,
       Cardio_schedule.Slot6,
       Cardio_schedule.Slot7,
       Cardio_schedule.Slot8
FROM   Cardiology
       CROSS JOIN Cardio_schedule
WHERE  Cardiology.Name = Cardio_schedule.Name
       AND Name = '" + TextBox1.Text + "'";
            cmd = new SqlCommand(str, con);
            con.Open();
            SqlDataAdapter adp = new SqlDataAdapter(cmd);
            DataTable dt = new DataTable();
            adp.Fill(dt);
            GridView1.DataSource = dt;
            GridView1.DataBind();
            con.Close();

不知道是什么问题。我确实用 ON 尝试过，但它在 'ON' 附近说语法不正确。任何形式的帮助将不胜感激。谢谢！

Answer 1

最后你错过了。

SELECT Cardiology.CID,
       Cardiology.NAME,
       Cardiology.Designation,
       Cardiology.Qualification,
       Cardiology.Shift,
       Cardiology.Appointment_Timings,
       Cardio_schedule.Ward_rounds,
       Cardio_schedule.Slot1,
       Cardio_schedule.Slot2,
       Cardio_schedule.Slot3,
       Cardio_schedule.Slot4,
       Cardio_schedule.BreakTime,
       Cardio_schedule.Slot5,
       Cardio_schedule.Slot6,
       Cardio_schedule.Slot7,
       Cardio_schedule.Slot8
FROM   Cardiology
       CROSS JOIN Cardio_schedule
WHERE  Cardiology.NAME = Cardio_schedule.NAME
       AND Cardiology.NAME = 'as'  -- `Cardiology` alias Missed

Answer 2

您的问题出在过滤器中：-

AND Name = '" + TextBox1.Text + "'";
            cmd = new SqlCommand(str, con);

根据您要参考的 table 更改它：-

AND Cardiology.Name = '" + TextBox1.Text + "'";
            cmd = new SqlCommand(str, con);

请注意，您的查询是针对 SQL Injection attack 开放的，因此您应该使用参数化查询，而不是像这样：-

string str = "Cardiology.CID,Cardiology.Name, .....WHERE  
              Cardiology.Name = Cardio_schedule.Name
              AND Cardiology.Name = @Name";
cmd = new SqlCommand(str, con);
cmd.Parameters.Add("@Name",DbType.NVarChar,20).Value = TextBox1.Text;
.....and so on

这里请注意，我认为您的数据类型是 NVarchar(20)，您需要相应地更改它。

Answer 3

在您的查询结尾应该有：

WHERE Cardiology.Name = Cardio_schedule.Name AND Cardio_schedule.Name = '"

或

WHERE Cardiology.Name = Cardio_schedule.Name AND Cardiology.Name = '"

只写名字属性会产生歧义。

不明确的列名？

Ambigous column name?

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sql-server

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