Question

我已经考虑了许多这个问题的解决方案，但我仍然无法解决这个问题。

SELECT Year FROM (SELECT DISTINCT YEAR(detDate1) AS Year 
FROM growl_details WHERE publish = 'y' AND pubNews = 'y' 
UNION 
SELECT DISTINCT YEAR(detDate1) AS Year FROM growl_pl_details
WHERE publish = 'y' AND pubNews = 'y') AS t ORDER BY 'Year' ASC

我有两个表，growl_details和growl_pl_details，我试图让它们只显示信息存在的年份，然后用它来创建一个表格，其中包含与当年有关的数据页面的链接。

显然我希望这些年按顺序展示，但上面的代码似乎是单独订购它们并且它们彼此继续......

有什么想法吗？

Answer 1

您的查询（格式化，以便我可以阅读）：

SELECT Year
FROM (SELECT DISTINCT YEAR(detDate1) AS Year
      FROM growl_details
      WHERE publish = 'y' AND pubNews = 'y'
      UNION
      SELECT DISTINCT YEAR(detDate1) AS Year
      FROM growl_pl_details
      WHERE publish = 'y' AND pubNews = 'y'
     ) AS t
ORDER BY 'Year' ASC;

问题是由order by子句引起的。尝试将单引号更改为引号：

ORDER BY `Year` ASC;

单引号用于字符串常量。返回引号围绕事物的名称。所以，你的原始查询是按常量排序 - 产生任意顺序。

使用mysql加入两个表并按日期排序

1 个答案: