MAX查询使用CAML

Question

我想选择一个具有特定列的最大值的共享点列表项.如何使用CAML查询执行此操作？

Answer 1

以下CAML查询将返回给定列的最大值:

var maxValue;

try
{
    using (SPSite objSite = new SPSite(sSiteUrl))
    {
        using (SPWeb objWeb = objSite.OpenWeb())
        {
            SPList objList = objWeb.Lists[sListName];

            SPQuery objQuery = new SPQuery();
            objQuery.Query = "<OrderBy><FieldRef Name='ColumnName' Ascending='False' /></OrderBy><RowLimit>1</RowLimit>";
            objQuery.Folder = objList.RootFolder;

            // Execute the query against the list
            SPListItemCollection colItems = objList.GetItems(objQuery);

            if (colItems.Count > 0)
            {
                maxValue = (<Insert Appropriate Cast>) colItems[0];
            }
        }
    }
}
catch (Exception ex)
{
    ...
}

return maxValue;

Answer 2

<Query>
    <OrderBy>
            <FieldRef Name="particularcolumn" Ascending="FALSE" />
    </OrderBy>
</Query>