maximum value of a column of data base

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VB

MS-Access

Hi how can i Take a max value of a field of data base?

Posted 17-Nov-11 20:30pm

synctor

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2 solutions

Solution 1

Use the MAX function (assuming you want the columnname from the tablename table):

SQL

select MAX(columnname) from [tablename]

Posted 17-Nov-11 20:41pm

Mehdi Gholam

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synctor 18-Nov-11 4:59am

how can i take that value ?

Mehdi Gholam 18-Nov-11 5:08am

Use ExecuteScalar.

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Sander Rossel · Accepted Answer · 2011-11-17T20:45:00

Solution 2

Probably using ADO.NET[^]. An Object Implementing IDbCommand[^] can take your query. In case of Access the OleDbCommand[^].

VB

Dim cmd As New OleDbCommand("SELECT MAX(MyColumn) FROM MyTable", connection) ' connection is an IDbConnection Object, OleDbConnection here.
Dim maxValue As Integer = cmd.ExecuteScalar

In case you're using an ORM like LINQ to XML or Entity Framework LINQ would do the trick.

VB

Dim i As Integer = context.MyTable.Max(Function(o) o.MyValue)

Hope it helps :)

Posted 17-Nov-11 20:45pm

Sander Rossel

Comments

synctor 18-Nov-11 5:03am

thank you

Sander Rossel 18-Nov-11 6:53am

No problem :)

Mehdi Gholam 18-Nov-11 5:08am

my 5!

Sander Rossel 18-Nov-11 6:53am

Thanks Mehdi :)