Mysql montly两年之间的总和？

Question

我正在获取特定年份的周记录。

   SELECT ....
      SUM(IF(YEARWEEK(readdate) = 201602, readamount, 0)) AS "201601w",
      SUM(IF(YEARWEEK(readdate) = 201701, readamount, 0)) AS "201701w" 
    FROM ...

如何在2到3年之间获得每月？

例如：

   SELECT ....
      SUM(IF(YEARMONTH(readdate) = 201602(Feb), readamount, 0)) AS "201601m",
      SUM(IF(YEARMONTH(readdate) = 201701(Jan), readamount, 0)) AS "201701m" 
    FROM ...

我的完整查询：

SELECT wirters.writer,
SUM(IF(YEARWEEK(readdate) = 201602, read, 0)) AS "201601",
SUM(IF(YEARWEEK(readdate) = 201701, read, 0)) AS "201701" 
FROM writers
LEFT JOIN reads ON wirters.writer_id = reads.writer_id   
GROUP BY wirters.writer

我需要输出

+---------------+---------+---------+
| writer        | 2016Feb | 2017Jan | 
+---------------+---------+---------+
| George Orwell |    13   |   663   |
| Dan Brown     |    22   |   32    |
+---------------+---------+---------+