MySQL查詢不選擇不同

Question

我有這樣的一個表：

Test_ID Question_ID User_ID 
--------------------------------- 
15   1   1 
15   2   1 
16   1   2 

而且我嘗試去通過該表並打印出像這樣爲每個用戶。 ：

測試ID：問題＃ 號碼：使用此，我只能得到＃

進出口打印出測試ID。通過聚合函數

$result = mysqli_query($conn, "SELECT DISTINCT(Test_ID) AS Tcode, COUNT(Question_ID) AS Qcount,User_ID FROM user_answers WHERE User_ID = 1"); 

    while ($data = mysqli_fetch_array($result)) { 

     echo ''.$data['Tcode'].''; 
     echo ''.$data['Qcount'].''; 


    } 

Answer 1

使用組（併爲此你don0t需要不同）

"SELECT Test_ID AS Tcode, COUNT(*) AS Qcount, User_ID 
     FROM user_answers 
     WHERE User_ID = 1 group by Tcode, User_ID ")