Mysql HEAP：删除重复的名称并在单个条目中添加这些值

我在MYSQL数据库中使用HEAP，我想获取数据，所以我使用下面的查询

select SUBSTRING (name, 1, CHARINDEX ('*' , name) - 1) as name, duration
FROM (
           SELECT b."identity" || '*' || session_id || '-' || a.user_id AS "name"
             ,MIN(time) AS "start"
             ,MAX(time) AS "last"
           ,((DATEDIFF('milliseconds', MIN(time), MAX(time))::FLOAT / 1000  ) / 60) AS "duration"

     FROM abc_app_production.all_events a ,abc_app_production.users b
     where    a.user_id = b.user_id
     AND b.user_type IS NOT NULL
     AND b."identity" IS NOT NULL
     AND b."identity" NOT IN ('Shubham')
     AND time >= convert(datetime,'2018-10-01') AND time <= convert(datetime,'2018-11-01')
   GROUP BY 1
     )

但我想在一行中添加所有持续时间，重复如下：

name            duration

John            0.77
Butler          0.0
Tom             39.64
Kathi Mike      0.0
Manish          4.38

---

我试了很多，但都有错误。请提前提供帮助和感谢。

您需要总和聚合，但由于group by子句放置错误，因此出现了错误-它应该位于子查询之外

select SUBSTRING (name, 1, CHARINDEX ('*' , name) - 1) as name, sum(duration) as duration
FROM (
           SELECT b."identity" || '*' || session_id || '-' || a.user_id AS "name"
             ,MIN(time) AS "start"
             ,MAX(time) AS "last"
           ,((DATEDIFF('milliseconds', MIN(time), MAX(time))::FLOAT / 1000  ) / 60) AS "duration"

     FROM abc_app_production.all_events a ,abc_app_production.users b
     where    a.user_id = b.user_id
     AND b.user_type IS NOT NULL
     AND b."identity" IS NOT NULL
     AND b."identity" NOT IN ('Shubham')
     AND time >= convert(datetime,'2018-10-01') AND time <= convert(datetime,'2018-11-01') 
     group by b."identity" || '*' || session_id || '-' || a.user_id
)X group by SUBSTRING (name, 1, CHARINDEX ('*' , name) - 1)

---

感谢@fa06仍然获取错误：无效操作：列b.identity必须出现在GROUP BY子句中或在聚合函数中使用；

select SUBSTRING (name, 1, CHARINDEX ('*' , name) - 1) as name, sum(duration) as duration
FROM (
           SELECT b."identity" || '*' || session_id || '-' || a.user_id AS "name"
             ,MIN(time) AS "start"
             ,MAX(time) AS "last"
           ,((DATEDIFF('milliseconds', MIN(time), MAX(time))::FLOAT / 1000  ) / 60) AS "duration"

     FROM abc_app_production.all_events a ,abc_app_production.users b
     where    a.user_id = b.user_id
     AND b.user_type IS NOT NULL
     AND b."identity" IS NOT NULL
     AND b."identity" NOT IN ('Shubham')
     AND time >= convert(datetime,'2018-10-01') AND time <= convert(datetime,'2018-11-01') 
     group by b."identity" || '*' || session_id || '-' || a.user_id
)X group by SUBSTRING (name, 1, CHARINDEX ('*' , name) - 1)