create table score(
id int,
player varchar(20),
position varchar(20),
score float
);

insert into score values(1,‘哈登‘,‘guard‘,30.0),(2,‘杜蘭特‘,‘vanguard‘,29.1),(3,‘詹姆斯‘,‘vanguard‘,28.3),(4,‘安東尼-戴維斯‘,‘vanguard‘,27.8),(5,‘利拉德‘,‘guard‘,27.2);

2.分組

SELECT 字段名1,........
FROM 表名
GROUP BY 字段名1......[HAVING 條件表達式]

（2）對球員位置歸類，顯示每一位置的總分

select position,sum(score) from score group by position;

(3) 查詢得分大於29的球員

select player,sum(score) from score group by player having sum(score)>29.0;

分組之後不能用where過濾要用having，having要用函數

(4)查詢球員得分大於27小於30

select player,sum(score) from score where score>27 group by player having sum(score)<30;

MySQL分組查詢