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我有 2 个日期字段，我试图在 where 子句中使用 OR。举个例子，

Select customer_records.customer_id, customer_records.join_date, rejected_customers.rejected_date, status_lookup.status_description 
From customer_records, rejected_customers, status_lookup
Where status_lookup.status_id(+) = customer_records.status_id and customer_records.customer_id = rejected_customers.customer_id
and (customer_records.join_date between to_date('01-10-2012','dd-mm-yyyy') and to_date('01-11-2012','dd-mm-yyyy') or rejected_customers.rejected_date between to_date('01-10-2012','dd-mm-yyyy') and to_date('01-11-2012','dd-mm-yyyy')

所以，基本结果应该是，当加入日期或被拒绝的日期落入我的日期字段时，我想要 customer_id。我似乎无法让它工作，任何帮助表示赞赏，谢谢！

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2 回答 2

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Select cr.customer_id, cr.join_date, rej.rejected_date
from customer_records cr left join rejected_customers rej on cr.customer_id=reg.customer_id
where (cr.join_date between to_date('01-10-2012','dd-mm-yyyy') and to_date('01-11-2012','dd-mm-yyyy')) or (rej.rejected_date between to_date('01-10-2012','dd-mm-yyyy') and to_date('01-11-2012','dd-mm-yyyy'))
于 2013-03-28T21:08:14.703 回答
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当你说你似乎无法让它工作时，我认为你运行了查询并且你没有得到预期的结果并且你没有得到任何错误。有时，一些日期字段与时间分数一起存储在数据库中。所以你需要使用“trunc”功能。请参阅 Oracle 数据库中的此示例：

SQL> select to_char(sysdate,  'dd/mm/yyyy hh:mi:ss') date_no_trunc from dual;

DATE_NO_TRUNC
-------------------
28/03/2013 10:04:27

SQL> select to_char(trunc(sysdate),  'dd/mm/yyyy hh:mi:ss') date_with_trunc from dual;

DATE_WITH_TRUNC
-------------------
28/03/2013 12:00:00

SQL>

所以你需要改变你的查询是这样的：

Select c.customer_id,
       c.join_date,
       r.rejected_date
From   customer_records c,
       rejected_customers r
Where  c.customer_id = r.customer_id
and   ( trunc(c.join_date) between to_date('01-10-2012','dd-mm-yyyy') and to_date('01-11-2012','dd-mm-yyyy')
        or
        trunc(r.rejected_date) between to_date('01-10-2012','dd-mm-yyyy') and to_date('01-11-2012','dd-mm-yyyy')
      )

此外，为长表名提供别名总是一个好主意，这会使您的查询更短并使用更少的内存。

于 2013-03-28T22:07:52.190 回答