sql分组后按条件统计

毕侄宝1133求救SQL分组查询统计查询语句 -
余厘纯15317498715 ______ 这样啊,那在取月份的时候加上条件就可以了,另外请注意,4月应该没有31号,如果转换成日期/时间比较的话就会出错 select c.姓名,c.登录月份,iif(isnull(d.次数),0,d.次数) as 次数 from ((select a.姓名,b.登录月份 from (select distinct 姓名 ...

毕侄宝1133SQL 分组条件聚合怎么实现 -
余厘纯15317498715 ______ 不是必须配合聚合函数的.如图,表a 如图分组即不包含聚合函数:select a from a group by a; 分组示意如下:group by a 即 a列相同的值为1组.聚合函数则是为了对数据分组后进行统计 如图分组即统计每组值的记录数:

毕侄宝1133求一条sql分组统计语句 -
余厘纯15317498715 ______ select 单位,count(distinct 部门) from 表 group by 单位

毕侄宝1133用Sql语句怎么 将分组查询得到的记录数 统计出来 -
余厘纯15317498715 ______ SELECT groupField ,COUNT(*) AS Num FROM TableX GROUP BY groupField

毕侄宝1133如何多条件分组查询? -
余厘纯15317498715 ______ SELECT b. NAME, sum(a.score) AS 分数 FROM tb1 a LEFT JOIN tb2 b ON SUBSTR(a.name FROM 1 FOR 1)= b.`name` GROUP BY b. NAME; 这个是Mysql的写法 Oracle把SubStr函数改一下就好

毕侄宝1133Oracle中sql语句分组后怎样统计出有多少分组 -
余厘纯15317498715 ______ 再套一层:select COUNT(1) from (select a.col1 from (select '11' col1 from dual union all select '22' from dual union all select '33' from dual union all select '11' from dual union all select '33' from dual union all select '22' from dual union all select '33' from dual union all select '11' from dual) a group by a.col1) t

毕侄宝1133sql怎样 分组统计得以下结果 -
余厘纯15317498715 ______ select 编号,规格,[名称]=stuff((select '/'+名称 from tb where 编号=a.编号 and 规格=a.规格 for xml path('')),1,1,'') from tb a group by 编号,规格