Oracle比较时间戳和日期

问题描述：

我有一个时间戳字段，我只想在Oracle查询中比较它的日期部分

I have a timestamp field and I just want to compare the date part of it in my query in Oracle

我该怎么做

SELECT *
FROM Table1
WHERE date(field1) = '2012-01-01'

答

您可以截断日期部分:

select * from table1 where trunc(field1) = to_date('2012-01-01', 'YYYY-MM-DD')

这种方法的麻烦之处在于，由于函数调用，field1上的任何索引都不会被使用.

The trouble with this approach is that any index on field1 wouldn't be used due to the function call.

或者(对索引更友好)

select * from table1 
 where field1 >= to_timestamp('2012-01-01', 'YYYY-MM-DD') 
   and field1 < to_timestamp('2012-01-02', 'YYYY-MM-DD')