MySQL enmu枚举类型能用avg()否求平均值?
现在数据库设计的是enum类型的，发现用avg求这个平均值是1了。在不改变数据结构的情况下有其他办法求平均值吗？
Functions such as SUM() or AVG() that expect a numeric argument cast the argument to a number if necessary. For ENUM values, the index number is used in the calculation.
->For calculate the average or summation of list of ENUM column values(numbers) then we have to first convert its type to CHARACTER then to INTEGER otherwise that will calculated its result based on its index value.
For example:
SELECT
AVG(CAST(CAST(enum_col AS CHAR) AS UNSIGNED INTEGER)) AS enum_avg
FROM table_name;
I hope the above informations regarding ENUM will give you some brief idea.