我正在尝试使用 COUNT() 函数失败

Question

我正在构建一个视图，该视图应该为我提供从事任何给定作业的学生人数。这是我目前所拥有的：

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

Answer 1

将您的声明更改为：

 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..

I am trying do utilize the COUNT() function unsuccessfully