AREA_ID,AREA_NAME,CITY_ID,CITY_NAMEFROMDW_DM_RE_RCGROUPBYAREA_ID,AREA_NAME,CITY_ID,CITY_NAME)T1LEFTJOIN(SELECTCOUNT(*)ASCOUNT,AREA_ID,AREA_NAMEFROMDW_DM_RE_RCGROUPBYAREA_ID,AREA_NAME)T2ONT1.AREA_ID=T2.AREA_IDANDT1.AREA_NAME=T2.AREA_NAME...
having称为分组过滤条件,也就是分组需要的条件,所以必须与group by联用。 需要注意说明:当同时含有where子句、group by 子句 、having子句及聚集函数时,执行顺序如下: 1、执行where子句查找符合条件的数据; 2、使用group by 子句对数据进行分组; 3、对group by 子句形成的组运行聚集函数计算每一组的值; 4、最后...
CREATE INDEX idx_age_name ON student(age,NAME);EXPLAIN SELECT SQL_NO_CACHE * FROM studentWHERE age = 30 AND stuno <101000 ORDER BY NAME ;[SQL]SELECT SQL_NO_CACHE * FROM student WHERE age = 30 AND stuno <101000 ORDER BY NAME ;受影响的行: 0时间: 2.949s key_len=5说明只使用到了a...
-- Syntax for SQL Server and Azure SQL Database-- ISO-Compliant SyntaxGROUPBY{ column-expression |ROLLUP(<group_by_expression>[ ,...n ] ) |CUBE(<group_by_expression>[ ,...n ] ) |GROUPINGSETS(<grouping_set>[ ,...n ] ) | ()--calculates the grand total} [ ,...n ]<group_by...
dealers in cities per car_model, using GROUP BY ALL > SELECT car_model, count(DISTINCT city) AS count FROM dealer GROUP BY ALL; car_model count --- --- Honda Civic 3 Honda CRV 2 Honda Accord 3 -- Sum of only 'Honda Civic' and 'Honda CRV' quantities per de...
dealers in cities per car_model, using GROUP BY ALL > SELECT car_model, count(DISTINCT city) AS count FROM dealer GROUP BY ALL; car_model count --- --- Honda Civic 3 Honda CRV 2 Honda Accord 3 -- Sum of only 'Honda Civic' and 'Honda CRV' quantities per dealership. > SE...
Europe FR Spa and Exercise Outfitters 286 246272.4 B. 使用 GROUP BY ROLLUP 在下例中,ROLLUP 运算符返回一个包含以下分组的结果集: Region、Country、Store 和 SalesPersonID Region、Country 和 Store Region和 Country Region 总计 ROLLUP 生成的分组数等于 ROLLUP 列表中的列数加上总计分组数。分组中...
SQL group by,between and,union,having 简介 union运算符，外连接，group分组，between and,having 工具/原料 mysql SQLyog 方法/步骤 1 学生表studentCREATETABLE`student`(`id`int(50)NOTNULLAUTO_INCREMENT,`name`varchar(50)DEFAULTNULL,`sex`varchar(48)DEFAULTNULL,`age`varchar(50)DEFAULTNULL,`birthday`...
Scalar subquery中没有显示Group By和limit,输出为Aggregation function。 Scalar subquery在join condition、where condition或select field中。 Scalar subquery和父查询的关联条件必须是等值条件,且各个condition之间是AND连接。 Scalar subquery中没有自定义函数或者随机函数。 利用Group By Aggregation将子查询解关联后的形...