Question

我有以下表格：

 res_id  quiz_id     sender_id   user_id     question_id   points
  1         1           2      33       20      0
  2         1           2      34       20      0   
  3         1           2      24       20      0
  4         2           3      22       2       1
  5         3           4      3        6       1

我想获得结果如果quiz_id对于三行是相同的并且question_id是相同的并且sender_id是相同的，则确保user_id不同并且点为0.如果满足此条件，则将1的传递值传递给php变量示例：

res_id  quiz_id     sender_id   user_id     question_id   points
  1         1           2      33       20      0
  2         1           2      34       20      0   
  3         1           2      24       20      0

Answer 1

“如果满足这个条件，则传递值为1到php变量”对我来说不是很清楚（你只是想知道有三行（或更多）行满足你的查询吗？）但查询应该像

SELECT 
  count(*)
FROM tab t1
  JOIN tab t2 ON(t1.quiz_id = t2.quiz_id)AND(t1.question_id = t2.question_id)AND(t1.sender_id = t2.sender_id)
  JOIN tab t3 ON(t1.quiz_id = t3.quiz_id)AND(t1.question_id = t3.question_id)AND(t1.sender_id = t3.sender_id)
WHERE(t1.user_id <> t2.user_id)AND(t2.user_id <> t3.user_id)AND(t1.user_id <> t3.user_id)
      AND(t1.points = 0)AND(t2.points = 0)AND(t3.points = 0)
GROUP BY t1.quiz_id, t1.sender_id, t1.question_id

当question_id相同且user_id不同时，sql查询计数

1 个答案: