sql - ORA-00936 From 中缺少表达式

Question

这就是我所拥有的；

SELECT course.course_no, enrollment.grade, 
FROM course, enrollment, course_section, student
WHERE course.course_no=course_section.course_no, 
course_section.c_sec_id=enrollment.c_sec_id, enrollment.s_id=student.s_id
AND student.s_first='Tammy', student.s_last='Jones';


FROM course, enrollment, course_section, student    
ERROR at line 2:
ORA-00936: missing expression

Answer 1

你在最后一列之后还有一个额外的逗号，在你的 where 子句中，你应该使用 AND 而不是 COMMA 试试这个

SELECT course.course_no, enrollment.grade
FROM course, enrollment, course_section, student
WHERE course.course_no=course_section.course_no AND  
course_section.c_sec_id=enrollment.c_sec_id AND 
enrollment.s_id=student.s_id AND 
student.s_first='Tammy' AND 
student.s_last='Jones';

Answer 2

使用AND而不是,在WHEREcaluse。还要从SELECT语句中删除最后一个额外的逗号。

SELECT course.course_no, enrollment.grade
FROM   course, 
       enrollment, 
       course_section, 
       student
WHERE  course.course_no = course_section.course_no        
AND    course_section.c_sec_id=enrollment.c_sec_id        
AND    enrollment.s_id=student.s_id
AND    student.s_first='Tammy'
AND    student.s_last='Jones';

Answer 3

您的 WHERE 子句格式不正确。

当 WHERE 子句有多个部分时，必须明确说明它们，而不仅仅是用逗号分隔：

SELECT course.course_no, enrollment.grade, 
FROM course, enrollment, course_section, student
WHERE course.course_no=course_section.course_no
AND course_section.c_sec_id=enrollment.c_sec_id
AND   enrollment.s_id=student.s_id
AND student.s_first='Tammy'
AND student.s_last='Jones';