字段数值连乘----
create table ##t(RM DECIMAL(10,4));
insert into ##t
select 2.34 union all
select 4.21 union all
select 6.65 union all
select 4.79;
--执行查询
SELECT * FROM ##t
Select power(10.0000, Sum(Log10(RM))) From ##t
--SELECT STDEV(RM) FROM ##t --标准差计算
drop table ##t