在 Oracle SQL 中将时间戳转换为日期

2021-12-30 00:00:00 datetime timestamp sql oracle11g oracle

我们如何将时间戳转换为日期?

How can we convert timestamp to date?

该表有一个字段，start_ts，其格式为 timestamp:

The table has a field, start_ts which is of the timestamp format:

'05/13/2016 4:58:11.123456 PM'

我需要查询表格并找到表格中的最大值和最小值timestamp，但我不能.

I need to query the table and find the maximum and min timestamp in the table but I'm not able to.

Select max(start_ts) 
from db 
where cast(start_ts as date) = '13-may-2016'

但是查询没有返回任何值.

But the query is not returning any values.

请帮我找出日期的最大时间戳.

Please help me in finding the max timestamp for a date.

推荐答案

CAST(timestamp_expression AS DATE)

例如，查询是:SELECT CAST(SYSTIMESTAMP AS DATE) FROM dual;

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