如何利用DataTable.select方法取出两列数据，两列名为“PPI”和“TEM”，将取出的数据放入新的DataTable中

Question

DataTable newDataTable = new DataTable();
newDataTable = oldDataTable.Clone();
DataRow[] foundRows = oldDataTable.select("该处表达式怎么写");
for (int i = 0; i < foundRows.Length; i++)
{
newDataTable .ImportRow((DataRow)foundRows[i]);
}

Answer 1

DataRow[] foundRows = oldDataTable.select("列明=‘PPI’ and 列明=‘TEM’");