boyyle
asked on
sql query
Hi,
I hava a table in Microsoft Access.
The table name is real_progress.
Below is the structure + value of the table.
Student_ID,Date,Sheet_No
100,03/01/2002,25
100,05/01/2002,50
100,14/01/2002,87
100,27/01/2002,110
100,01/02/2002,120
100,05/02/2002,130
100,21/02/2002,145
100,14/03/2002,150
100,17/03/2002,170
100,09/04/2002,200
Now,i'd like to write a sql query to get the Sheet_No whereby this Sheet_No is the
LAST record for that month.
So,the result i expect is 110,145,170 and 200
Meanwhile,i manage to get this result using 2 loops.But i wonder can i done this in a faster way?
Dim query as String
Dim query1 as String
Dim m as Integer
Set rs = New ADODB.Recordset
Set rs1 = New ADODB.Recordset
query = "select distinct Month(Date) as month_temp from real_progress where Student_ID=100 order by Month(Date)"
Set rs = cn.Execute(query)
If Not rs.EOF Then
rs.MoveFirst
Do While Not rs.EOF
m = rs("month_temp")
query1 = "select Sheet_No from real_progress where Student_ID=100 and Month(Date) = " & m & " order by Date desc"
Set rs1 = cn.Execute(query1)
If Not rs1.EOF Then
Debug.Print m & "<>" & rs1("Sheet_No")
End If
Set rs1 = Nothing
rs.MoveNext
Loop
Else
MsgBox "no record"
Exit Sub
End If
Set rs = Nothing
Thank You in advance.
I hava a table in Microsoft Access.
The table name is real_progress.
Below is the structure + value of the table.
Student_ID,Date,Sheet_No
100,03/01/2002,25
100,05/01/2002,50
100,14/01/2002,87
100,27/01/2002,110
100,01/02/2002,120
100,05/02/2002,130
100,21/02/2002,145
100,14/03/2002,150
100,17/03/2002,170
100,09/04/2002,200
Now,i'd like to write a sql query to get the Sheet_No whereby this Sheet_No is the
LAST record for that month.
So,the result i expect is 110,145,170 and 200
Meanwhile,i manage to get this result using 2 loops.But i wonder can i done this in a faster way?
Dim query as String
Dim query1 as String
Dim m as Integer
Set rs = New ADODB.Recordset
Set rs1 = New ADODB.Recordset
query = "select distinct Month(Date) as month_temp from real_progress where Student_ID=100 order by Month(Date)"
Set rs = cn.Execute(query)
If Not rs.EOF Then
rs.MoveFirst
Do While Not rs.EOF
m = rs("month_temp")
query1 = "select Sheet_No from real_progress where Student_ID=100 and Month(Date) = " & m & " order by Date desc"
Set rs1 = cn.Execute(query1)
If Not rs1.EOF Then
Debug.Print m & "<>" & rs1("Sheet_No")
End If
Set rs1 = Nothing
rs.MoveNext
Loop
Else
MsgBox "no record"
Exit Sub
End If
Set rs = Nothing
Thank You in advance.
the above seems ok if sheet number always increases as date increases. otherwise I could only come up with
SELECT *
FROM real_progress AS temp
WHERE temp.sheet_no IN (Select val(mid(buffo,9)) from (select left(fiddle,6), max(fiddle) as buffo from (Select format(Year(date) ,"0000") + format(month(date),"00") + format(day(date),"00") + cstr(Sheet_No) as fiddle from real_progress where student_id = 100) group by left(fiddle,6)))
SELECT *
FROM real_progress AS temp
WHERE temp.sheet_no IN (Select val(mid(buffo,9)) from (select left(fiddle,6), max(fiddle) as buffo from (Select format(Year(date) ,"0000") + format(month(date),"00") + format(day(date),"00") + cstr(Sheet_No) as fiddle from real_progress where student_id = 100) group by left(fiddle,6)))
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Select Max(Sheet_No) As Sheet_No From Real_Progress Where Student_ID = 100 Group By Month(Date) Order By Month(Date)