请问这条语句的执行结果
access 表1:列1(市编号) 列2(县编号)
Recordset3.Source = "SELECT max(列1) FROM 表1"
Recordset3.CursorType = 0
Recordset3.CursorLocation = 2
Recordset3.LockType = 1
Recordset3.Open()
g=Recordset3.Fields.Item("expr1000").Value
当表为空表时(无任何记录)
g的值是什么?null?0?好像都不是