SQL查询一批数据，怎么在最后一行增加个合计

1.示例

注解：null是rollup产生的汇总项

2.对yf字段进行处理就可以显示“合计”

注解：但是要显示的字段类型必须与yf字段类型一致，若yf是int，就不能显示varchar类型

3.显示的字段类型必须要与查询结果字段类型一致

示例代码：select      case when yf is not null then yf else '合计' end yf,     sum(cast(bqbj1 as money)) bjhz,     sum(cast(bqll1 as money)) lxhz,     sum(cast(bqwh as money)) whhzfrom (select SUBSTRING(rq,6,2) yf,bqbj1,bqll1,bqwh      from formtable_main_84_dt1 d       where rq between '2017-07-01' and '2017-09-30') as agroup by yfwith rollup