mysql - 如何计算年份及其值(value)？

Question

<分区>

Answer 1

试试这个:

SELECT MONNUMBER, 
       MAX(CASE WHEN YEARNUMBER = 2011 THEN MONTOTAL ELSE 0 END) AS Year2011,
       MAX(CASE WHEN YEARNUMBER = 2012 THEN MONTOTAL ELSE 0 END) AS Year2011
FROM (SELECT YEAR(PAYMENTDATE) AS YEARNUMBER, MONTH(PAYMENTDATE) AS MONNUMBER, 
             SUM(AMOUNT) AS MONTOTAL
      FROM PAYMENTS
      GROUP BY YEAR(PAYMENTDATE)
    ) AS A
GROUP BY MONNUMBER