LeetCode 614~1050 mysql

Author: LjyYano

solution/0600-0699/0614.Second Degree Follower/README.md

@@ -13,23 +13,17 @@ None
 
 <!-- tabs:start -->
 
-### **Python3**
-<!-- 这里可写当前语言的特殊实现逻辑 -->
+### **SQL**
 
-```python
-
-```
-
-### **Java**
-<!-- 这里可写当前语言的特殊实现逻辑 -->
-
-```java
-
-```
-
-### **...**
 ```
-
+SELECT followee AS follower,
+        count(distinct(follower)) AS num
+FROM follow
+WHERE followee IN 
+    (SELECT follower
+    FROM follow)
+GROUP BY  followee
+ORDER BY  followee
 ```
 
-<!-- tabs:end -->
+<!-- tabs:end -->

solution/0600-0699/0614.Second Degree Follower/README_EN.md

@@ -11,21 +11,17 @@ None
 
 <!-- tabs:start -->
 
-### **Python3**
+### **SQL**
 
-```python
-
-```
-
-### **Java**
-
-```java
-
-```
-
-### **...**
 ```
-
+SELECT followee AS follower,
+        count(distinct(follower)) AS num
+FROM follow
+WHERE followee IN 
+    (SELECT follower
+    FROM follow)
+GROUP BY  followee
+ORDER BY  followee
 ```
 
-<!-- tabs:end -->
+<!-- tabs:end -->

solution/0600-0699/0614.Second Degree Follower/Solution.sql

@@ -0,0 +1,8 @@
+SELECT followee AS follower,
+        count(distinct(follower)) AS num
+FROM follow
+WHERE followee IN
+    (SELECT follower
+    FROM follow)
+GROUP BY  followee
+ORDER BY  followee

solution/0600-0699/0615.Average Salary Departments VS Company/README.md

@@ -13,23 +13,10 @@ None
 
 <!-- tabs:start -->
 
-### **Python3**
-<!-- 这里可写当前语言的特殊实现逻辑 -->
+### **SQL**
 
-```python
-
-```
-
-### **Java**
-<!-- 这里可写当前语言的特殊实现逻辑 -->
-
-```java
-
-```
-
-### **...**
 ```
 
 ```
 
-<!-- tabs:end -->
+<!-- tabs:end -->

solution/0600-0699/0615.Average Salary Departments VS Company/README_EN.md

@@ -11,21 +11,10 @@ None
 
 <!-- tabs:start -->
 
-### **Python3**
+### **SQL**
 
-```python
-
-```
-
-### **Java**
-
-```java
-
-```
-
-### **...**
 ```
 
 ```
 
-<!-- tabs:end -->
+<!-- tabs:end -->

solution/0600-0699/0618.Students Report By Geography/README.md

@@ -13,23 +13,22 @@ None
 
 <!-- tabs:start -->
 
-### **Python3**
-<!-- 这里可写当前语言的特殊实现逻辑 -->
+### **SQL**
 
-```python
-
-```
-
-### **Java**
-<!-- 这里可写当前语言的特殊实现逻辑 -->
-
-```java
-
-```
-
-### **...**
 ```
-
+SELECT MAX(CASE 
+		WHEN continent = 'America' THEN name
+	END) AS America, MAX(CASE 
+		WHEN continent = 'Asia' THEN name
+	END) AS Asia
+	, MAX(CASE 
+		WHEN continent = 'Europe' THEN name
+	END) AS Europe
+FROM (
+	SELECT name, continent, row_number() OVER (PARTITION BY continent ORDER BY name) AS rk
+	FROM student
+) t
+GROUP BY rk
 ```
 
-<!-- tabs:end -->
+<!-- tabs:end -->

solution/0600-0699/0618.Students Report By Geography/README_EN.md

@@ -11,21 +11,22 @@ None
 
 <!-- tabs:start -->
 
-### **Python3**
+### **SQL**
 
-```python
-
-```
-
-### **Java**
-
-```java
-
-```
-
-### **...**
 ```
-
+SELECT MAX(CASE 
+		WHEN continent = 'America' THEN name
+	END) AS America, MAX(CASE 
+		WHEN continent = 'Asia' THEN name
+	END) AS Asia
+	, MAX(CASE 
+		WHEN continent = 'Europe' THEN name
+	END) AS Europe
+FROM (
+	SELECT name, continent, row_number() OVER (PARTITION BY continent ORDER BY name) AS rk
+	FROM student
+) t
+GROUP BY rk
 ```
 
-<!-- tabs:end -->
+<!-- tabs:end -->

solution/0600-0699/0618.Students Report By Geography/Solution.sql

@@ -0,0 +1,13 @@
+SELECT MAX(CASE
+		WHEN continent = 'America' THEN name
+	END) AS America, MAX(CASE
+		WHEN continent = 'Asia' THEN name
+	END) AS Asia
+	, MAX(CASE
+		WHEN continent = 'Europe' THEN name
+	END) AS Europe
+FROM (
+	SELECT name, continent, row_number() OVER (PARTITION BY continent ORDER BY name) AS rk
+	FROM student
+) t
+GROUP BY rk

solution/0600-0699/0619.Biggest Single Number/README.md

@@ -13,23 +13,17 @@ None
 
 <!-- tabs:start -->
 
-### **Python3**
-<!-- 这里可写当前语言的特殊实现逻辑 -->
+### **SQL**
 
-```python
-
-```
-
-### **Java**
-<!-- 这里可写当前语言的特殊实现逻辑 -->
-
-```java
-
-```
-
-### **...**
 ```
-
+SELECT (
+		SELECT num
+		FROM my_numbers
+		GROUP BY num
+		HAVING COUNT(*) = 1
+		ORDER BY num DESC
+		LIMIT 1
+	) AS num
 ```
 
-<!-- tabs:end -->
+<!-- tabs:end -->

solution/0600-0699/0619.Biggest Single Number/README_EN.md

@@ -11,21 +11,17 @@ None
 
 <!-- tabs:start -->
 
-### **Python3**
+### **SQL**
 
-```python
-
-```
-
-### **Java**
-
-```java
-
-```
-
-### **...**
 ```
-
+SELECT (
+		SELECT num
+		FROM my_numbers
+		GROUP BY num
+		HAVING COUNT(*) = 1
+		ORDER BY num DESC
+		LIMIT 1
+	) AS num
 ```
 
-<!-- tabs:end -->
+<!-- tabs:end -->