#1179 Reformat Department Table

https://leetcode.com/problems/reformat-department-table/

MS SQL Server

SELECT id, 
    [Jan] AS [Jan_Revenue], [Feb] AS [Feb_Revenue], [Mar] AS [Mar_Revenue],
    [Apr] AS [Apr_Revenue], [May] AS [May_Revenue], [Jun] AS [Jun_Revenue],
    [Jul] AS [Jul_Revenue], [Aug] AS [Aug_Revenue], [Sep] AS [Sep_Revenue],
    [Oct] AS [Oct_Revenue], [Nov] AS [Nov_Revenue], [Dec] AS [Dec_Revenue]
FROM (
    SELECT id, month, revenue FROM Department) AS sr
    PIVOT(SUM(revenue) FOR month IN(
        [Jan], [Feb], [Mar], [Apr], [May], [Jun],
        [Jul], [Aug], [Sep], [Oct], [Nov], [Dec]
    )
) AS pv

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