我试图使用COUNT（）函数失败

Question

我正构建一个视图，该视图应该为我提供从事任何特定任务的学生人数。以下是我到目前为止的情况：

CREATE VIEW v_count AS
    SELECT assignment_no, COUNT(*)
    FROM assignment WHERE          

Answer 1

将您的陈述更改为：

 CREATE VIEW v_count AS
 SELECT assignment_no, COUNT(*) as ct
 FROM assignment
 group by assignment_no

Answer 2

CREATE OR REPLACE VIEW v_count AS
   SELECT assignment_no, COUNT(*) as CountOfStudents
   FROM assignment
     group by assignment_no

试试这个..