對普通學生和非普通學生進行排序

Question

我想選擇沒有失敗成績的學生。

Stud_id grade_1 grade_2 grade_3 RATE 
    123  1.5  3.00  2.00 regular 
    234  2.00  1.50  5.00 irregular 
    567  3.00  2.00  2.00 regular 

select COUNT（stud_id）WHERE grade BETWEEN 1 AND 3 AND NOT not grade IN（0,5）。

我得到所有普通學生的代碼是這樣的。

SELECT COUNT(DISTINCT stud_id FROM grade 
WHERE grade BETWEEN 1 AND 3 AND stud_id ='$student') 

但我的問題在這裏已經失敗等級也會算，因爲他也傳給其他年級學生。

Sample mysql picture

，你可以在圖片中看到的學生與ID =「67453432」應該只將與「常規」狀態出現，因爲他不具有任何失敗年級學生。而另一名學生因爲有1個或更多失敗分數而顯示爲「不規則」。

的結果應該是這樣的

EXAMPLE ONLY!!! 
    if grade BETWEEN 1 AND 3 AND Dont have 0.00 OR 5.00 = REGULAR 
    BUT if GRADE BETWEEN 1 AND 3 AND HAVE 0.0 OR 5.00 = IRREGULAR 

    Stud_ID RATE 
    67453432 REGULAR 
    123  REGULAR 
    234  IRREGULAR 
    567  REGULAR 

Answer 1

您可以通過下面的查詢得到了不規則的學生：

SELECT stud_id, 'Irregular' 
FROM students 
WHERE grade IN (0,5); 

和普通學生通過下面的查詢：

SELECT stud_id, 'Regular' 
FROM students 
WHERE grade BETWEEN 1 AND 3 
AND stud_id NOT IN (
    SELECT stud_id 
    FROM students 
    WHERE grade IN (0,5) 
); 

現在，你可以用UNION這兩個查詢來得到結果，例如：

SELECT stud_id, 'Irregular' 
FROM students 
WHERE grade IN (0,5) 

UNION 

SELECT stud_id, 'Regular' 
FROM students 
WHERE grade BETWEEN 1 AND 3 
AND stud_id NOT IN (
    SELECT stud_id 
    FROM students 
    WHERE grade IN (0,5) 
);