Example

Teradata Vantageā„¢ Data Types and Literals

brand
Software
Teradata Vantage
prodname
Teradata Database
Teradata Vantage NewSQL Engine
vrm_release
16.20
category
Programming Reference
featnum
B035-1143-162K

Assuming the current date is DATE '2008-05-14' at time zone displacement, INTERVAL '09:00' HOUR TO MINUTE, the following SELECT statements return the result: TIMESTAMP '2008-05-14 13:30:00'.

SET TIME ZONE INTERVAL '09:00' HOUR TO MINUTE;
SELECT CAST(TIME '08:30:00+04:00' AS TIMESTAMP(0));
SELECT CAST(TIME '08:30:00+04:00' AS TIMESTAMP(0) AT LOCAL);

The time zone displacement, INTERVAL '04:00' HOUR TO MINUTE, in the literal is used to determine the UTC value '04:30:00' and time zone displacement, INTERVAL '04:00' HOUR TO MINUTE, of the literal. For the CAST, the source expression value '04:30:00' at UTC is adjusted to the current session time zone displacement, INTERVAL '09:00' HOUR TO MINUTE to yield '13:30:00'.

A timestamp is formed from the current date '2008-05-14' at time zone displacement, INTERVAL HOUR '09:00' TO MINUTE, and the time portion of the source expression value '13:30:00'. Then this timestamp, '2008-05-14 13:30:00', at time zone displacement, INTERVAL '09:00' HOUR TO MINUTE, is adjusted to UTC so that the CAST result is '2008-05-14 04:30:00' at UTC.

The result value of the CAST at UTC is adjusted to the current session time zone displacement, INTERVAL '09:00' HOUR TO MINUTE, so the result of the SELECT statements is: TIMESTAMP '2008-05-14 13:30:00'.