Question

当我运行以下查询时，它会返回Date_add (CURDATE() AND CURDATE(), interval 30 day)内日期的所有结果，但不包括Date_sub (CURDATE() AND CURDATE(), interval 15 day)的结果

我知道在使用deadline = '2015-01-15'

的精确子句进行查询时数据存在

可能出现什么问题？

SELECT bug_id, 
       bug_status, 
       resolution, 
       short_desc, 
       deadline 
FROM   bugs 
WHERE  bug_status IN ( 'RESOLVED' ) 
       AND deadline BETWEEN Curdate() AND Date_add(Curdate(), interval 30 day) 
        OR deadline BETWEEN Curdate() AND Date_sub(Curdate(), interval 15 day)

Answer 1

订购between的兰特。所以，第二个between不正确。另外，您可能需要括号：

WHERE  bug_status IN ( 'RESOLVED' ) AND
       (deadline BETWEEN Curdate() AND Date_add(Curdate(), interval 30 day) OR
        deadline BETWEEN Date_sub(Curdate(), interval 15 day)  AND Curdate()
       )

我的意思是，您可能不想要括号，因此查询将是：

WHERE  (bug_status IN ( 'RESOLVED' ) AND
        deadline BETWEEN Curdate() AND Date_add(Curdate(), interval 30 day)
       ) OR
       deadline BETWEEN Date_sub(Curdate(), interval 15 day)  AND Curdate()

在这种情况下，括号是多余的，但它们澄清了逻辑。

Answer 2

between的论点应始终为value BETWEEN low AND high。如果您翻转low和high，它将返回false。此外，您可以将两个条件统一为一个：

deadline BETWEEN Date_sub(Curdate(), interval 15 day) AND 
                 Date_add(Curdate(), interval 30 day)

MySql日期查询结果不正确

2 个答案: