Question

我有两个可以为空的DATE字段（PublishFrom，PublishTo）。我试图通过此查询获取记录：

SELECT * FROM tblNews 
    WHERE Publish = 1 
    AND IFNULL(PublishFrom, CURDATE() - INTERVAL 1 DAY) <= "2015-03-13" 
    AND IFNULL(PublishTo, CURDATE() + INTERVAL 1 DAY) >= "2015-03-13" 
    ORDER BY DateCreated DESC'

意思是如果这些字段中的（一个）字段的值为空，则将其替换为昨天的值和/明天的值，以便始终显示该条目。

现在我只看到PublishFrom和/或PublishTo不为空的帖子。怎么样？

Answer 1

使用CURDATE() + 1或- 1会转换CURDATE并搞砸比较。 Instead use + INTERVAL 1 DAY (or - INTERVAL 1 DAY)

Answer 2

为什么不使用显式逻辑？

SELECT *
FROM tblNews 
WHERE Publish = 1  AND
     (PublishFrom <= '2015-03-13' OR PublishFrom IS NULL) AND
     (PublishTo >= '2015-03-13' OR PublishTo IS NULL)
ORDER BY DateCreated DESC

IFNULL不像我想的那样工作

2 个答案: