在数据库中计数教师

• Z时代
• 2024-01-10
• 分类：问答

我认为我有正确的想法来解决这个功能，但我不知道为什么当我尝试测试它时出现此错误。任何人都可以帮我解决这个问题吗？在数据库中计数教师

cur.execute（Q） sqlite3.OperationalError：邻近 “具有”：语法错误

课程表：ID，场，章节，名称 位置表：ID，

所需的输出：

>>> courses_how_many_instructors(db) 
[('HLTC16H3F', 2), ('MATA29H3F', 2), ('MATA32H3F', 3), ('MATA67H3F', 2), \ 
('MGAB01H3F', 3), ('MGAB03H3F', 2), ('MGAD65H3F', 2), ('BIOA01H3F', 3), \ 
('POLB80H3F', 2), ('STAB22H3F', 2), ('VPMA93H3F', 2), ('CHMA10H3F', 2), \ 
('CHMB16H3F', 2), ('CSCA08H3F', 2), ('CSCA67H3F', 2)] 
def courses_how_many_instructors(db): 
'''Return the course number and the number of instructors for courses with 
more than one instructor. Note that this means the ID must be 
the same for each instructor.''' 
query = '''SELECT Course, Name FROM Courses WHERE NAME>1 GROUP BY HAVING COUNT(Name)''' 
return run_query(db, query) 

回答：

SELECT course, COUNT(DISTINCT name) AS num_instructors 
FROM  courses 
GROUP BY name 
HAVING COUNT(DISTINCT name) > 1 

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