Question

我有查询来获取数据cost_month / month，如下所示：

select sum(xscf_cost_month) as cost_month
from ncloud_data_service_cof a
join ncloud_data_ba b on b.xcba_cof_no = a.xscf_cof_no
where to_time('2014-05', 'YYYY-mm') between to_char(b.xcba_activation_date, 'YYYY-mm') and to_char(b.xcba_end_activation_date, 'YYYY-mm')

上面的

查询显示错误： “错误：运算符不存在：日期＆gt; =文本第4行：to_date（'2014-05'，'YYYY-mm'）在to_char之间（b.xcba_a ...“

如何解决？我尝试使用to_time更改to_char，但没有得到解决方案。请帮帮我..

Answer 1

你打算这个吗？

select sum(xscf_cost_month) as cost_month
from ncloud_data_service_cof a join
     ncloud_data_ba b
     on b.xcba_cof_no = a.xscf_cof_no
where '2014-05' between to_char(b.xcba_activation_date, 'YYYY-mm') and 
                        to_char(b.xcba_end_activation_date, 'YYYY-mm');

您无需转换字符串'2014-05'。它已经是一个字符串。

Answer 2

这个仍然可以使用列b.xcba_activation_date和b.xcba_end_activation_date上的索引：

SELECT sum(xscf_cost_month) as cost_month
FROM ncloud_data_service_cof a 
     JOIN
         ncloud_data_ba b ON b.xcba_cof_no = a.xscf_cof_no
WHERE to_time('2014-05', 'YYYY-mm') BETWEEN date_trunc('month', b.xcba_activation_date) AND date_trunc('month', b.xcba_end_activation_date);

在日期之间获取数据

2 个答案: