Question

我有两张桌子：

活动：

-id;名称; startevent; ENDEVENT;是PersonID;
RegistracijaKorisnik：

-id; IME;

现在我写了这个：

SqlDataAdapter da = new SqlDataAdapter(
         "SELECT [id], [name], [eventstart], [eventend] " +
         "FROM [Event] " + 
         "WHERE NOT (([eventend] <= @start) OR ([eventstart] >= @end))",
       con);

只有这个显示名称，eventstart，eventend。现在我想显示Person表中的名称和名称，eventstart，偶然从事件。在Event表中，我想将EventID中的PersonID加入Person表中的ID字段。你能救我吗？

编辑：所有代码，不知道为什么不显示p.ime

protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            DayPilotCalendar1.StartDate = DayPilot.Utils.Week.FirstDayOfWeek(new DateTime(2012, 09, 17));
            DayPilotCalendar1.DataSource = dbGetEvents(DayPilotCalendar1.StartDate, DayPilotCalendar1.Days);
            DataBind();
        }

    }


 protected DataTable dbGetEvents(DateTime start, int days)
    {

      SqlConnection con = new SqlConnection();
      con.ConnectionString = @"Data Source=.\SQLEXPRESS;Initial Catalog=Korisnik;Integrated Security=True";
      //SqlDataAdapter da = new SqlDataAdapter("SELECT [id], [name], [eventstart], [eventend] FROM [Event] WHERE NOT (([eventend] <= @start) OR ([eventstart] >= @end))", con);
     //SqlDataAdapter da = new SqlDataAdapter("select  e.id as EventId, e.name as EventName, e.eventstart, e.eventend, p.Id as PersonId, p.ime as PersonName from Event e inner join RegistracijaKorisnik p on e.PersonID=p.id where not (([eventend] <= @start) OR ([eventstart] >= @end))", con);
      //SqlDataAdapter da = new SqlDataAdapter("SELECT e.id, e.name, e.eventstart, e.eventend, p.ime FROM Event e INNER JOIN RegistracijaKorisnik p ON e.PersonID = p.id WHERE NOT ((e.eventend <= @start) OR (e.eventstart >= @end ))", con);
      SqlDataAdapter da = new SqlDataAdapter("SELECT e.id, e.name, e.eventstart, e.eventend, p.ime AS 'Person Name' FROM Event e INNER JOIN RegistracijaKorisnik p ON e.PersonID = p.id WHERE NOT ((e.eventend <= @start) OR (e.eventstart >= @end ))", con);
      da.SelectCommand.Parameters.AddWithValue("start", start);
      da.SelectCommand.Parameters.AddWithValue("end", start.AddDays(days));

      DataTable dt = new DataTable();
      da.Fill(dt);
      return dt; 


    }

Answer 1

JOIN两个表：

SELECT e.id, e.name, e.eventstart, e.eventend,
       p.Name + ' ' + p.Surname AS 'Person Name'
FROM Event e
INNER JOIN Person p ON e. PersonID = p.ID
WHERE NOT ((e.eventend <= @start) OR (e.eventstart >= @end ))

Answer 2

select 
  e.id as EventId
  ,e.name as EventName
  ,e.startevent
  ,e.endevent
  ,p.Id as PersonId
  ,p.name as PersonName 
  ,p.surname as PersonSurname
  ,p.email
from Event e
join Person p on e.PersonId=p.Id
where not (([eventend] <= @start) OR ([eventstart] >= @end))

Answer 3

如果我理解你的问题，这只是一个简单的连接，如下所示：

SELECT e.id, e.name, e.eventstart, e.eventend, p.name
FROM Event e
   INNER JOIN Person p ON p.Id = e.ID
WHERE NOT ((e.eventend <= @start) OR (e.eventstart >= @end)

Answer 4

两个表中有相同的列名。

解决此问题的原因是

您可以在查询中使用完全限定的列名称 tablename.columnname - 即event.id，person.id等或
您可以使用alias lik 选择事件为e

哪个应该有用

如何编写这个SQL语句？

4 个答案: