SQL语句分类变量计数与百分比统计

SQL语句分类变量计数与百分比统计 select reviewAverage,count(reviewAverage) as count from table_nm group by reviewAverage having reviewAverage is not null order by reviewAverage 简单的查询语句大家都比较容易的理解。select 字段A,count(A)
相关文章
相关标签/搜索