Syntax error in aggregate argument: Expecting a single column argument with possible 'Child' qualifier

Question

DataTable distinctTable = dTable.DefaultView.ToTable(true,\"ITEM_NO\",\"ITEM_STOCK\");
DataTable dtSummerized = new DataTable(\"SummerizedResult\");

dtSummerized.Co         


        

Answer 1

In my case the issue was with my query itself.

My query returned difference of two columns. Like, query="Select A,B,A-B from Table" and I was performing sum on datatable using compute function as dt.Compute("Sum(A-B)","").

So, datatable was unable to compute the sum of A-B column. I gave the difference column alias as query="Select A,B,(A-B) as AB from Table" and dt.Compute("Sum(AB)","").

Thus, resolved the error.

Answer 2

The problem is exactly about your DataType of the column. If you have a row with dynamically added columns without DataType like that (it may be a result of a manual calculation or cross-tab query-like)

myTable.Columns.Add("AddedColumn");

You will probably face with the column conversion issue. Instead, If you change your add method with pointing DataType like below

myTable.Columns.Add("AddedColumn", typeof(System.Int32));

It will work I think. It's what I experienced & fixed before...

Answer 3

You want to write:

dTable.Compute("sum(CONVERT(ITEM_STOCK, 'System.Double'))",
               "ITEM_NO='" + dRow["ITEM_NO"].ToString() + "'")

instead of:

dTable.Compute("sum(" + TotalItem + ")", "ITEM_NO="...

because it will translate to dTable.Compute("sum(value_of_TotalItem), "ITEM_NO="..., value_of_TotalItem is a double and is not a column name.

See DataTable.Compute

UPDATE:

try this:

DataTable distinctTable = dTable.Clone();
dTable.Columns.Add("ITEM_STOCK_D", typeof(Decimal),
                   "CONVERT(ITEM_STOCK, 'System.Decimal')");
foreach (DataRow dRow in dTable.Rows)
{
    String itemNo = dRow["ITEM_NO"].ToString();
    if(distinctTable.Select(String.Format("ITEM_NO = '{0}'",itemNo)).Length == 0)
    {
        double totalStock = Convert.ToDouble(dTable.Compute("SUM(ITEM_STOCK_D)",
                                     String.Format("ITEM_NO = '{0}'", itemNo))); 
        distinctTable.Rows.Add(itemNo, totalStock.ToString());
    }
}
dTable.Columns.Remove("ITEM_STOCK_D");

Answer 4

You might try this:

dTable.Compute("sum([" + TotalItem + "])","");

I.e enclose your column name in square brackets [ ]

The idea is from this post.