摘要：--测试数据如下create table tbla( typename varchar(50))insert into tblaselect 'dt-051' union allselect 'dt-052' union allselect 'dt-053' union allselect 'dt-054' union allselect 'dt-055' union allselect 'dt-056'create table tblb( typename varchar(50), num int 阅读全文