drop table if exists t;
create table t(id int,qty numeric); 
insert into t 
select 1,3.1415 union all  
select 2,1.5 union all 
select 3,6 union all 
select 4,5 ; 
--执行查询 
Select power(10,Sum(Log(10,qty)))::numeric(20,5) From t 
--查询结果 141.36750