The timestamp and timestamp line follow the same rule of comparison?

Hi all

Maybe the topic is confusing. My question is if A timestamp is later than B, to_char (A) must be greater than to_char (B)?

Before I never used the string to timestamp or date, so I've not thought about it.

After some tests, I can't find any exception. But I want to get the confirmation from you.

Thank you very much.
Leon

Hi, Leon,

user12064076 wrote:
Thank you, all.

Your answers are useful. I'm sorry that I does not specify the mask of format here. The format looks at 2010-12-11 00:00:00
and all the time stamp follow this format.

The output looks like in ' 2010-12-11 00:00:00 '.»
The format specifier is "YYYY-MM-DD HH24:MI:SS"? If so, the chain is suitable for use in an ORDER BY clause, or a comparison of inequality, but it is always best to use the original TIMESTAMP column where possible.

In this case, are time and the time range the same thing?

No.; expressions of different types of data are never the same. No TIMESTAMP is the same as any string. No chain is identical to any TIMESTAMP.
Oracle allows you to compare the expressions of different types of data, but it's never a good idea. One of the expressions will be implicitly converted to the other data type, not necessarily in a way you understand or simply. It is always best to call an explicit conversion function, if you must compare different types of data.

If so, I have not use to_date or to_timestamp all at once, in which case the partition size will be disabled.

You must use TO_DATE during the partitioning of a table based on a DATE column.
You must use TO_TIMESTAMP during the partitioning of a table based on a TIMESTAMP column.

It would be useful that you have published the specific code examples.

Tags: Database

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