Question

我有以下查询返回重复的行，如何摆脱它们：

select a.code, b.daytime, b.created_date 
from ov a, CURVE b 
where b.curve_object_id = a.object_id 
order by b.daytime

我正在寻找的是从第二个表中提取对象名称（在我的情况下是它的代码）的最佳方法，其中object_id在两个表中相同？

Answer 1

您是否尝试group by消除重复的行，如下所示？

select a.code, b.daytime,b.created_date 
    from ov a, CURVE b 
    where b.curve_object_id=a.object_id 
    group by a.code, b.daytime,b.created_date 
    order by b.daytime

Answer 2

始终使用现代显式JOIN语法。

也就是说，您可以在选择中使用distinct：

select distinct a.code,
    b.daytime,
    b.created_date
from ov a
join CURVE b on b.curve_object_id = a.object_id
order by daytime

摆脱重复的行

2 个答案: