mysql 判断最大值,最小值,第二大,第三大 一共四个值

最大值：select max(num) from table

第二大值：select max(num) from table

where num not in(select max(num) from table)

第三大值：select max(num) from table

where num not in(select max(num) from table

where num not in(select max(num) from table))

最小值：select min(num) from table

select max(字段名) from tableName limit 0,1 最大

select min(字段名) from tableName limit 0,1 最小

select * from tableName order by 字段名 DESC limit 0,1 最大

select * from tableName order by 字段名 ASC limit 0,1 最小

---