主题：[求助]列不显示

我这样测试没问题，肯定不是下面这段代码的问题。

Dim cmd As new SQLCommand
cmd.CommandText = "select a.*, b.第二列 as 金额1 from {表A} as a left join {表B} as b on a.第一列 =  b.第一列"
Dim dt As DataTable = cmd.ExecuteReader
msgbox(dt.compute("sum(金额1)"))