sql实现分组查询的短语(SQL实现分组查询的短语是)

sql分组查询的完整语句

分组查询 group by 主要是对(count,sum,avg,min,max)

a b c

一 1 2

一 1 3

二 2 5

三 7 7

二 9 9

select a,sum(b),sum(c) from A group by a

对分组数据进行限制

select a,sum(b),sum(c) from A group by a having sum(b)>5根据species分组查询,group by 后面要写species,前面列出来的内容,除了species以外,如果是表里的字段都要用聚合函数,比如计数,求和,平均,最大值,最小值select A.b ,count(1),sum(A.b) from dual;答案在这里

SQL语句分组查询笔试题

select match_date,

sum(case when 佛跳墙原名 match_result ='win' then 1 else 0 end) as amount_win,

sum(case when match_result='lose' then 1 else 0 end) as amount_lose

from t_match

group by match_dateselect?racedate,

sum(case?when?result?=?'胜'?then?1?else?0?end)?胜,

sum(case?when?result?=?'负'?then?1?else?0?end)?负

from?gameresult

group?by?racedate

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