Oracle 比较时间戳和日期
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Oracle comparing timestamp with date
提问by user1050619
I have a timestamp field and I just want to compare the date part of it in my query in Oracle
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
How do I do that,
我怎么做，
SELECT *
FROM Table1
WHERE date(field1) = '2012-01-01'
回答by beny23
You can truncatethe date part:
您可以截断日期部分：
select * from table1 where trunc(field1) = to_date('2012-01-01', 'YYYY-MM-DD')
The trouble with this approach is that any index on field1wouldn't be used due to the function call.
这种方法的问题在于，field1由于函数调用，不会使用任何索引。
Alternatively (and more index friendly)
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')
回答by hol
You can truncate the date
您可以截断日期
SELECT *
FROM Table1
WHERE trunc(field1) = to_Date('2012-01-01','YYY-MM-DD')
Look at the SQL Fiddlefor more examples.
查看SQL Fiddle以获取更多示例。
回答by Tolga ?EL?K
to_dateformat worked for me. Please consider the date formats:
MON-, MM, ., -.
to_date格式对我有用。请考虑日期格式：
MON-, MM, ., -。
t.start_date >= to_date('14.11.2016 04:01:39', 'DD.MM.YYYY HH24:MI:SS')
t.start_date <=to_date('14.11.2016 04:10:07', 'DD.MM.YYYY HH24:MI:SS')
