贴上sql语句：
drop table if EXISTS testprocedure;
create table testprocedure(
id int auto_increment PRIMARY key,
price float
);
insert into testprocedure (price) values (1.1),(2.1),(3.4),(5.4),(11.2),(8.9);
create procedure getprocedureprice(
out zz float,
out zx float,
out zc float,
out zv int
)
BEGIN
select max(price) into zz from good;
select min(price) into zx from good;
select avg(price) into zc from good;
select FLOOR(price) into zv from good;
END
在调用的时候会出现“ Result consisted of more than one row”错误，这是因为floor()函数是将float数据转化为int数据，目标对象是整个列，所以在调用的时候会出现这样的问题。只要加上限制条件即可（limit）。