add ： 180

h-j-13 · h-j-13 · commit 3f8d3867037f · 2018-03-27T15:40:44.000+08:00
diff --git a/Soulution/180. Consecutive Numbers.md b/Soulution/180. Consecutive Numbers.md
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+# 180. Consecutive Numbers
+
+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               |
++-----------------+
+```
+
+## 题目大意
+找出连续出现三次的数字
+
+## SQL  
+```SQL
+# Write your MySQL query statement below
+SELECT DISTINCT a.Num AS ConsecutiveNums 
+FROM `Logs` a LEFT JOIN `Logs` b ON a.id + 1 = b.id 
+    LEFT JOIN `Logs` c on b.id + 1 = c.id
+WHERE a.Num = b.num AND b.num = C.num
+
+```
+
+值得注意的是，表名logs好像是sql的保留字（输入后会变深蓝） 使用 "`" 来将其声明为表名
