TIMESTAMP and TIMESTAMP WITH TIMEZONE

Pretty simple scenario. A table with 2 columns, without constraints. Column of TS is the TIMESTAMP data type. Column TS_TZ is the TIMESTAMP WITH TIME ZONE data type. Accuracy for both is 4. I'm studying explicit data type conversions. In order to enhance my understanding, I'm experimenting with the insertion of string literals:

INSERT INTO TEST_DATA_TYPES (ts, ts_tz)

VALUES (19-SEPT-14 02:24:14 ', 19-SEP-14 02:24:14 ');

The attempt above raise 01840. 00000 - 'entry not long enough for the date format value.

INSERT INTO TEST_DATA_TYPES (ts, ts_tz)

VALUES (19-SEPT-14 02:24:14 ', 19-SEP-14 02:24:14 ');

INSERT INTO TEST_DATA_TYPES (ts, ts_tz)

VALUES (19-SEPT-14 02:24:14 ', 19-SEP-14 02:24:14.0');

Two inserts above work. Note that I changed was the chain of ts_tz. In one, I added 'AM' and in others I added a fraction of a second. He was the first attempt fail because Oracle needs some sort of explicit indication where precision ends before the name of the region can be added?

Hello

2679789 wrote:

... In order to enhance my understanding, I'm experimenting with the insertion of string literals:

INSERT INTO TEST_DATA_TYPES (ts, ts_tz)

VALUES (19-SEPT-14 02:24:14 ', 19-SEP-14 02:24:14 ');

...

It is very important to understand that you should not use a string where other data type (for example, a TIMESTAMP) is expected; She simply asked in trouble.  Even if make you it work properly today, you can do something next week, as apply a patch, that will not not have to work.  Use the conversion functions explicitly, like TO_TIMESTAMP, iwhen, you must.  Never rely on implicit conversions.

Learn exactly why a given implicit conversion may not be a good way to invest your time.

Tags: Database

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