连续出现的数字

 

连续出现的数字 - LeetCode (中国) https://leetcode-cn.com/problems/consecutive-numbers/description/

 

Write a SQL query to find all numbers that appear at least three times consecutively.

+----+-----+
| Id | Num |
+----+-----+
| 1  |  1  |
| 2  |  1  |
| 3  |  1  |
| 4  |  2  |
| 5  |  1  |
| 6  |  2  |
| 7  |  2  |
+----+-----+

For example, given the above Logs table, 1 is the only number that appears consecutively for at least three times.

+-----------------+
| ConsecutiveNums |
+-----------------+
| 1               |
+-----------------+

SELECT DISTINCT(Num) AS ConsecutiveNums FROM Logs AS L WHERE
Num = (SELECT Num FROM Logs tmp0 WHERE tmp0.Id=L.Id+1)
AND Num = (SELECT Num FROM Logs tmp0 WHERE tmp0.Id=L.Id+2);

 

错误答案：

SELECT Num AS ConsecutiveNums FROM (
-- 汇聚模式子值
SELECT GROUP_CONCAT(caseChk) AS toChkStr,Num FROM (

-- 构造模式
SELECT L.*,
CASE
WHEN Id=1 THEN 0
WHEN ( Id>1 AND Num = (SELECT Num FROM Logs tmp0 WHERE tmp0.Id=L.Id-1) ) THEN 0
ELSE 1
END AS caseChk
FROM Logs AS L
) AS tPartern GROUP BY Num
) AS tPertenGroup WHERE INSTR(toChkStr,'1,0,0') OR INSTR(toChkStr,'0,0,0');