Les16

Oracle9 i Datetime Functions

Objectives ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

TIME ZONES -08:00 The image represents the time for each time zone when Greenwich time is 12:00. -05:00 +02:00 +10:00 +07:00

Oracle9 i Datetime Support ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

TZ_OFFSET SELECT TZ_OFFSET('Canada/Yukon') FROM DUAL; SELECT TZ_OFFSET('Europe/London') FROM DUAL; ,[object Object],[object Object],[object Object],SELECT TZ_OFFSET('US/Eastern') FROM DUAL;

CURRENT_DATE ,[object Object],[object Object],[object Object],ALTER SESSION SET NLS_DATE_FORMAT = 'DD-MON-YYYY HH24:MI:SS'; ALTER SESSION SET TIME_ZONE = '-8:0'; SELECT SESSIONTIMEZONE, CURRENT_DATE FROM DUAL; ALTER SESSION SET TIME_ZONE = '-5:0'; SELECT SESSIONTIMEZONE, CURRENT_DATE FROM DUAL;

CURRENT_TIMESTAMP ,[object Object],[object Object],ALTER SESSION SET TIME_ZONE = '-8:0'; SELECT SESSIONTIMEZONE, CURRENT_TIMESTAMP FROM DUAL; ALTER SESSION SET TIME_ZONE = '-5:0'; SELECT SESSIONTIMEZONE, CURRENT_TIMESTAMP FROM DUAL; ,[object Object]

LOCALTIMESTAMP ALTER SESSION SET TIME_ZONE = '-5:0'; SELECT CURRENT_TIMESTAMP, LOCALTIMESTAMP FROM DUAL; ALTER SESSION SET TIME_ZONE = '-8:0'; SELECT CURRENT_TIMESTAMP, LOCALTIMESTAMP FROM DUAL; ,[object Object],[object Object]

DBTIMEZONE and SESSIONTIMEZONE SELECT DBTIMEZONE FROM DUAL; SELECT SESSIONTIMEZONE FROM DUAL; ,[object Object],[object Object]

EXTRACT SELECT EXTRACT (YEAR FROM SYSDATE) FROM DUAL; ,[object Object],[object Object],SELECT last_name, hire_date, EXTRACT (MONTH FROM HIRE_DATE) FROM employees WHERE manager_id = 100;

TIMESTAMP Conversion Using FROM_TZ SELECT FROM_TZ(TIMESTAMP '2000-03-28 08:00:00','3:00') FROM DUAL; ,[object Object],[object Object],SELECT FROM_TZ(TIMESTAMP '2000-03-28 08:00:00', 'Australia/North') FROM DUAL;

STRING To TIMESTAMP Conversion Using TO_TIMESTAMP and TO_TIMESTAMP_TZ SELECT TO_TIMESTAMP_TZ('1999-12-01 11:00:00 -8:00', 'YYYY-MM-DD HH:MI:SS TZH:TZM') FROM DUAL; SELECT TO_TIMESTAMP ('2000-12-01 11:00:00', 'YYYY-MM-DD HH:MI:SS') FROM DUAL; ,[object Object],[object Object]

Time Interval Conversion with TO_YMINTERVAL SELECT hire_date, hire_date + TO_YMINTERVAL('01-02') AS HIRE_DATE_YMININTERVAL FROM EMPLOYEES WHERE department_id = 20; ,[object Object]

Summary ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],In this lesson, you should have learned how to use the following functions:

Practice 16 Overview ,[object Object],[object Object]

Les16

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