摘要: 语法如下: SELECT [字段名],COUNT(1) FROM [表名] Group By [字段名] Having Count(1) > 1 如下图所示,我们要查询表内年龄重复的个数 SELECT Age,COUNT(1) AS RepeatData FROM Student Group by 阅读全文
posted @ 2019-04-15 22:10 大北票 阅读(2631) 评论(0) 推荐(0) 编辑