task: #1179

Author: Ivanbyone

README.md

@@ -125,6 +125,7 @@ Useful for preparing for technical interviews and improving your SQL skills.
     - [1075. Project Employees I](./leetcode/easy/1075.%20Project%20Employees%20I.sql)
     - [1141. User Activity for the Past 30 Days I](./leetcode/easy/1141.%20User%20Activity%20for%20the%20Past%2030%20Days%20I.sql)
     - [1148. Article Views I](./leetcode/easy/1148.%20Article%20Views%20I.sql)
+    - [1179. Reformat Department Table](./leetcode/easy/1179.%20Reformat%20Department%20Table.sql)
     - [1211. Queries Quality and Percentage](./leetcode/easy/1211.%20Queries%20Quality%20and%20Percentage.sql)
     - [1251. Average Selling Price](./leetcode/easy/1251.%20Average%20Selling%20Price.sql)
     - [1280. Students and Examinations](./leetcode/easy/1280.%20Students%20and%20Examinations.sql)

leetcode/easy/1179. Reformat Department Table.sql

@@ -0,0 +1,39 @@
+/*
+Question 1179. Reformat Department Table
+Link: https://leetcode.com/problems/reformat-department-table/description/?envType=problem-list-v2&envId=database
+
+Table: Department
+
++-------------+---------+
+| Column Name | Type    |
++-------------+---------+
+| id          | int     |
+| revenue     | int     |
+| month       | varchar |
++-------------+---------+
+In SQL,(id, month) is the primary key of this table.
+The table has information about the revenue of each department per month.
+The month has values in ["Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"].
+ 
+
+Reformat the table such that there is a department id column and a revenue column for each month.
+
+Return the result table in any order.
+*/
+
+SELECT
+    id,
+    SUM(CASE WHEN month = 'Jan' THEN revenue END) AS Jan_Revenue,
+    SUM(CASE WHEN month = 'Feb' THEN revenue END) AS Feb_Revenue,
+    SUM(CASE WHEN month = 'Mar' THEN revenue END) AS Mar_Revenue,
+    SUM(CASE WHEN month = 'Apr' THEN revenue END) AS Apr_Revenue,
+    SUM(CASE WHEN month = 'May' THEN revenue END) AS May_Revenue,
+    SUM(CASE WHEN month = 'Jun' THEN revenue END) AS Jun_Revenue,
+    SUM(CASE WHEN month = 'Jul' THEN revenue END) AS Jul_Revenue,
+    SUM(CASE WHEN month = 'Aug' THEN revenue END) AS Aug_Revenue,
+    SUM(CASE WHEN month = 'Sep' THEN revenue END) AS Sep_Revenue,
+    SUM(CASE WHEN month = 'Oct' THEN revenue END) AS Oct_Revenue,
+    SUM(CASE WHEN month = 'Nov' THEN revenue END) AS Nov_Revenue,
+    SUM(CASE WHEN month = 'Dec' THEN revenue END) AS Dec_Revenue
+FROM Department
+GROUP BY id