使用 SQL 合计函数 你可以确定数据组的各种统计。你可以把这些函数用于查询和合计表达式，条件是在具备 SQL特性的 QueryDef对象中或在创建基于SQL查询的 Recordset对象时-You use the SQL aggregate functions to determine various statistical data sets. You can put these functions together for query and expression, on the condition that the availability of SQL characteristics QueryDef object or create a SQL query based on the Recordset object