A question about the conservation of fields (hour, min, sec) time DATE type in the table on the changes of NLS_DATE_FORMAT

Hello

Oracle version: 12.1.0.1.0 - 64 bit

OS: Fedora Core 17 X86_64

My question is about the conservation of fields (hour, minute, second) time DATE type in the array on NLS_DATE_FORMAT changes.

Take the following test case:

SQL> create table tmptab(dateval date);

Table created.

SQL> alter session set nls_date_format = 'yyyy-mm-dd hh24:mi:ss';

Session altered.

SQL> insert into tmptab(dateval) values('2014-01-01 00:00:00');

1 row created.

SQL> insert into tmptab(dateval) values('2014-01-01 10:00:00');

1 row created.

SQL> commit;

Commit complete.

SQL> select * from tmptab;

DATEVAL
-------------------
2014-01-01 00:00:00
2014-01-01 10:00:00

SQL> alter session set nls_date_format = 'yyyy';

Session altered.

SQL> select * from tmptab where dateval > '2014';

no rows selected

SQL>

I don't understand why it returns nothing. The second test case above insert statement inserted a line with 10 as the value for the time of the DATE field column dateval.

Accordingly, while comparing this with the literal '2014' (which based on the new value of NLS_DATE_FORMAT = "yyyy" is implicitly converted to DATE), shouldn't the above query returns the line 2014-01-01 10:00 ?

I mean, I changed the NLS_DATE_FORMAT but data from time in the table fields are preserved and that's why they should normally be taken into account in the comparison of date.

What I'm trying to say is that for me (Please correct me if I'm wrong), no matter what NLS_DATE_FORMAT configuration is the following test

SQL> select * from tmptab where dateval > '2014';

is the same thing that

SQL> select * from tmptab where dateval > to_date('2014-01-01 00:00:00', 'yyyy-mm-dd hh24:mi:ss');

And because the line 2014-01-01 10: 00:00 in the tmptab table. The following test

2014-01-01 10:00:00 > to_date('2014-01-01 00:00:00', 'yyyy-mm-dd hh24:mi:ss')

evolves normally true (beucase of TIME = 10 on the left side of the test) and therefore this line must be returned which is not the case in the test above.

You kindly could you tell me what I misunderstood?

Thanks in advance,

This is the price for the use of implicit conversions. Implicit DATE conversion rules are not as direct as it can be assumed. In your case, all you provide is year as date format. In this case date implicit conversion rules assumes that month in the current month, day 1 and time as 00:00:00.

SQL > alter session set nls_date_format = "yyyy";

Modified session.

SQL > select to_char (to_date ('2014 "), ' mm/dd/yyyy hh24:mi:ss') twice;

TO_CHAR (TO_DATE('20)
-------------------
01/08/2014-00:00:00

SQL >

So, when you start:

Select * from tmptab where dateval > '2014 '.

Oracle implicitly converts date using "YYYY", which translates as August 1, 2014 '2014'. That's why your quesry returns no rows.

SY.

Tags: Database

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I have a question about the localTimeStamp function. According to the documentation for this function is
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---------------------------------------------------------------------------

24 JANUARY 14 09.45.42.253732 H + 01:00

SQL >

Why introduce the foregoing did not fail? the data type of the column in my table colval expects a timestamp with time zone

during each which inserts as I understand (correct me if I'm wrong) is not provided by the localTimeStamp function.

Could someone kindly tell me what I misunderstood?

Thanks in advance,

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