awesome-leetcode-sql/leetcode/easy/1179. Reformat Department Table.sql at afba6c35c3f6bcbef1da8e5d6dfa0fb54f2bdcd7 · Ivanbyone/awesome-leetcode-sql · GitHub

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/*
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