Dating difference

17-Nov-2015 21:17 by coper21 8 Comments

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Oracle's datetime and interval datatypes and time zone support make it possible to store consistent information about the time of events and transactions. The date format in the example includes a two-digit number for the day of the month, an abbreviation of the month name, the last two digits of the year, and a 24-hour time designation. Oracle automatically converts character values that are in the default date format into date values when they are used in date expressions.

Oracle that includes a time zone offset or time zone region name in its value.The time zone offset is the difference (in hours and minutes) between local time and UTC (Coordinated Universal Time, formerly Greenwich Mean Time).Specify the as follows: data stored in the database is normalized to the database time zone, and the time zone offset is not stored as part of the column data.When users retrieve the data, Oracle returns it in the users' local session time zone.Specify the SELECT * FROM table_tstz; C_ID C_TSTZ ---------- ------------------------------------ 1 01-JAN-03 .0000 AM - 2 01-JAN-03 .000000 AM - 3 01-JAN-03 .000000 AM - datatype when you need a datetime value without locale information.A datatype is appropriate when the original time zone is of no interest, but the relative times of events are important. These fractions are also returned by Oracle built-in SQL functions for common operations on Returns the date and time of the operating system on which the database resides, taking into account the time zone of the database server's operating system that was in effect when the database was started .

Consider the transactions described in the previous banking example. The result of many date operations includes a fraction. You can specify their values by setting them in the initialization parameter file.

Suppose the data is recorded using the , then an employee in Hong Kong who displays the data would see that the deposit was made at 7 p.m. If the same data is displayed in London, it would show that the deposit was made at 11 a.m. The three-hour difference is preserved, but the time zone/region of the original transaction is not. The following is one example of specifying an interval of 4 days, 5 hours, 12 minutes, 10 seconds, and 222 thousandths of a second. You can specify their values for a client as client environment variables.

For example, you can store information about the times when workers punch a timecard in and out of their assembly line workstations.

The datatype when the application is used across time zones. Unless time zone information is stored with the account transactions, it appears that the account is overdrawn from 9 a.m. The datatypes because it stores time zone information.

Consider a banking company with offices around the world. in London and a withdrawal of the same amount from the account at 9 a.m. The time zone is stored as an offset from UTC or as a time zone region name.

The data is available for display or calculations without additional processing.

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