主题：相同表结构的临时表合并

Dim cmd As New SQLCommand
cmd.ConnectionName = "数据源名称"
Dim dt As DataTable
Dim cmb As WinForm.ComboBox
cmd.CommandText = "SELE CT 日期，客户，产品，销售额 From {订单}"
dt = cmd.ExecuteReader()

dt增加 fa piao号、开piao金额两个临时列

Dim cmd1 As New SQLCommand
cmd1.ConnectionName = "数据源名称"
Dim dt1 As DataTable
Dim cmb1 As WinForm.ComboBox
cmd1.CommandText = "SEL ECT 日期，客户，fa piao号，开piao金额 From {财务}"
dt1 = cmd1.ExecuteReader()

dt1增加 产品、销售额两个临时列

这样，两个表的表结构就一样了。  

希望：按照时间顺序，将两个表合并为一个表。