GROUP_CONCAT中的DATE_FORMAT

Question

我试图执行此查询，但它会在几个月内返回一个空单元格：

SELECT 
 year(publication) AS year, 
 GROUP_CONCAT(DISTINCT DATE_FORMAT(month(publication), '%M') ORDER BY month(publication) ASC) AS months
 from texts 
 GROUP BY year(publication) ORDER BY year (publication) DESC

Whitout DATE_FORMAT，查询工作正常。但我需要返回几个月的名字。

Answer 1

替换

DATE_FORMAT(month(publication), '%M') 

与

DATE_FORMAT(publication, '%M') 

Answer 2

您还可以使用GROUP_CONCAT(from_unixtime(timestamp,'%d-%m-%y %H:%i:%s') separator ', ')