我sqlquery的可以顯示。熱門

Question

| id | courseID | courseType | 
+-----------+-------------+----+ 
| 1 | 0  |  2  | 
| 2 | 2  |  2  | 
| 3 | 0  |  0  | 
| 4 | 10 |  4  | 
| 5 | 2  |  2  | 
| 6 | 0  |  0  | 
| 7 | 0  |  0  | 
| 8 | 5  |  2  | 
| 9 | 5  |  2  | 
| 10 | 5  |  2  | 
+-----------+-------------+----+ 

我想列出，首先用CourseType所有CourseID作爲

| courseID | courseType | 
+-----------+-----------+ 
| 5  | 2  | 
| 2  | 2  | 
| 10  | 4  | 
+-----------+-----------+ 

Answer 1

select distinct courseID, courseType 
from your_table 
where 0 not in (courseID, courseType) 
order by courseID desc 

Answer 2

select distinct top 3 courseID,courseType 
from table 
order by courseID,courseType desc 

Answer 3

爲了得到courseId, courseType對最事件和漏報任何一個其中有0您應該運行此查詢：

SELECT courseId, courseType FROM t 
WHERE 0 NOT IN (courseId, courseType) 
GROUP BY courseId, courseType 
ORDER BY count(*) DESC