[英]How to write this SQL statement?
I have two tables: 我有两个表:
Event: 事件:
-id; -ID; name;
名称; startevent;
startevent; endevent;
结局 PersonID;
PersonID;
RegistracijaKorisnik: RegistracijaKorisnik:
-id; -ID; ime;
我;
Now i have written this: 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);
With this only display name , eventstart, eventend. 仅使用显示名称,eventstart和eventend。 Now I would like to display the name from the Person table and name, eventstart, eventend from event .
现在,我想显示Person表中的名称,以及event的名称,eventstart和eventend。 In the Event table, I would like to join the PersonID from the Event table to the ID field in the Person table.
在“事件”表中,我想将“事件”表中的PersonID联接到“人”表中的ID字段。 Can you help me?
你能帮助我吗?
Edit: All code, and don't know why don't show the p.ime 编辑:所有代码,并且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;
}
JOIN
the two tables: 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 ))
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))
If I understand your question correctly, this is just a simple join, as follows: 如果我正确理解了您的问题,则这只是一个简单的联接,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)
You have same column names in two tables. 您在两个表中具有相同的列名。
Resolution to this problem is 解决此问题的方法是
you can either use fully qualified column names in query like tablename.columnname - ie event.id, person.id etc or 您可以在查询中使用完全限定的列名,例如tablename.columnname-即event.id,person.id等,或
You can use alias lik select event as e 您可以将别名lik select事件用作e
which should work 哪个应该工作
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