[英]How to group two fields together in SQL?
說我有一個 sql,它目前返回所有參加過每年比賽的足球運動員。 像這樣:
name year goals
john 2010 1
john 2006 2
john 2006 8
fred 2006 1
但我希望結果按他們玩的年份分組,但如果他們來自不同的年份,則不要壓縮玩家名稱,如下所示:
name year goals
john 2010 1
john 2006 10 <--- This is compressed, but there are still 2 johns
fred 2006 1 since they are from different years
說到目前為止我已經這樣做了。
(select name, year, goals
from table) as T
如果我只是這樣做
select *
from
(select name, year, goals
from table) as T
group by year;
Fred 會消失,但如果我執行“按名稱分組”,則只剩下 1 個 john。 有什么幫助嗎?
select name, year, sum(goals) as totalgoals
from table
group by name, year
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