Question

我有2个表数据库;

Firt table的列;

ClubID（主键，启用自动增量），ClubName

第二个表的列;

ShowID（主键，启用自动增量），ShowDate，ClubID

用户在表单上选择俱乐部名称，当用户选择名称时，用户选择的表格上的日期必须在表格上列出。

这是代码;

SqlCeConnection Conn = new SqlCeConnection("Data Source=|DataDirectory|CeoDatabase.sdf;Password=CeoDB;Persist Security Info=True");
            Conn.Open();

            SqlCeCommand GetDates = new SqlCeCommand("SELECT ShowDate FROM Shows INNER JOIN Shows ON  Shows.ClubID = Clubs.ClubID WHERE Clubs.ClubName='" + cmb_ClubNamesList.SelectedItem.ToString() + "'", Conn);

            SqlCeDataReader WriteDates= RezervasyonlariAl.ExecuteReader();


            while (WriteDates.Read())
            {
               cmb_ClubNamesList.Items.Add(WriteDates["ShowDate"]);
            }

此代码抛出“表别名必须唯一。[重复别名的名称=显示]”SqlCeCommand GetDates行上的异常。

Answer 1

看起来你正在加入节目。我认为你这样做的意思是：

SELECT ShowDate FROM Shows INNER JOIN Clubs ON  Shows.ClubID = Clubs.ClubID WHERE Clubs.ClubName='" + cmb_ClubNamesList.SelectedItem.ToString() + "'"

如何在Sql Compact上连接表？

1 个答案: