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mysql求平均值
MySQL AVG函数
比如: SELECT AVG(student_score) AS score_avg FROM tb_students_score;
如何使用MySQL计算一条记录的平均值
计算一条记录的平均值实际上就是横向求平均值,可以参考下例:
select
id,
(col1+col2+
col3)/3
as
avgVal
from
T1
where
id=123;
mysql 求日平均值的语句怎么写?
select left(`时间`,10),`类型`,avg(`排名`) from tablename group by left(`时间`,10),`类型` order by left(`时间`,10),`类型`
select DATE_FORMAT(`时间`,%Y-%m-%d) ,`类型`,avg(`排名`) from tablename group by DATE_FORMAT(`时间`,%Y-%m-%d) ,`类型` order by DATE_FORMAT(`时间`,%Y-%m-%d) ,`类型`
mysql语句 查询求平均
select start, end, avg(value) from (
select t2.start, t2.end, t1.value from t1 left join t2 on t1.key between t2.start and t2.end
) as x group by start,end;
效果见下图: