计算一个表中的组的总和并加入其他表sql

Question

我在sql中有两个表。

table_team

t_id team_name 
1  ABC 
2  XYZ 
3  PQR 

我还有一个table_player

p_id t_id player_name payment 
10 1   Sam   1000 
20 1   jon   500 
30 2   will   680 
40 1   bob   700 
50 3   rob   890 

我想球队的这两个表总付款。

我是每个球员在特定球队和所有球队的薪金总和。

我想尝试

select t_id,team_name,sum(b.payment) as total_payment from table_team a 
left join table_player b on a.t_id = b.t_id 

Answer 1

加入到计算每队支付总额的子查询：

SELECT t1.t_id, t1.team_name, t2.total_payment 
FROM table_team t1 
INNER JOIN 
(
    SELECT t_id, SUM(payment) AS total_payment 
    FROM table_player 
    GROUP BY t_id 
) t2 
    ON t1.t_id = t2.t_id 
-- WHERE t1.team_name IN ('ABC', 'XYZ') 

Answer 2

select t_id,team_name,sum(b.payment) as total_payment 
from table_team a 
left join table_player b on a.t_id = b.t_id 
group by t_id,team_name 

Answer 3

select t_id,team_name,sum(isnull(b.payment,0)) as total_payment from table_team a 
left join table_player b on a.t_id = b.t_id 
group by t_id, team_name 

只需添加一个group by，它应该工作