如何修复此计数报告，找不到FROM关键字

Question

我正在尝试创建一个sql语句

 SELECT   ACTIVITY_ID, ACTIVITY_DESCRIPTION,

我选择了任务活动，因为它将4个表连接在一起

 COUNT(*) NAME AS NAMECount

我使用上面的count语句来计算志愿者人数

 DESCRIPTION AS TASK
 FROM

这是内连接

 TASK_ACTIVITY
 INNER JOIN
 VOLUNTEER ON VOLUNTEER.VOLUNTEER_ID = TASK_ACTIVITY.VOLUNTEER_ID
 INNER JOIN
 TASK ON TASK.TASK_ID = TASK_ACTIVITY.TASK_ID
 GROUP BY VOLUNTEER.NAME;

我收到此错误

  

ORA-00923：未找到FROM关键字

Answer 1

您可以使用以下查询。提供列名称中的别名和按列分组以使其工作，因为您没有提到哪个列属于哪个表

SELECT   ACTIVITY_ID,
 ACTIVITY_DESCRIPTION,
COUNT(*), NAME AS NAMECount,
 DESCRIPTION AS TASK
 FROM TASK_ACTIVITY TASK_ACTIVITY
 INNER JOIN
 VOLUNTEER VOLUNTEER 
ON VOLUNTEER.VOLUNTEER_ID = TASK_ACTIVITY.VOLUNTEER_ID
 INNER JOIN
 TASK ON TASK.TASK_ID = TASK_ACTIVITY.TASK_ID
 GROUP BY ACTIVITY_ID, ACTIVITY_DESCRIPTION, TASK, VOLUNTEER.NAME;