td_week_of_calendar - Teradata Database

td_week_of_calendar

Purpose  

Returns the number of weeks from the beginning of the calendar starting on 01/01/1900 to the specified date.

Syntax  

where:

Syntax element…	Specifies…
SYSLIB	the name of the database where the function is located.
expression	an expression that results in a DATE, TIMESTAMP, or TIMESTAMP WITH TIME ZONE value.

ANSI Compliance

This is a Teradata extension to the ANSI SQL:2011 standard.

Argument Types

td_week_of_calendar is an overloaded scalar function. It is defined with the following parameter data types:

DATE

TIMESTAMP

TIMESTAMP WITH TIME ZONE

If the argument passed to the function does not match one of these declared data types, an error is returned indicating that the function does not exist.

For more information on overloaded functions, see “Function Name Overloading” in SQL External Routine Programming.

Result

The result is an INTEGER value representing the number of full weeks since and including the week of 01/01/1900, where the first partial week is 0.

Usage Notes

The td_week_of_calendar function provides improved performance compared to using the Sys_Calendar.Calendar system view to obtain similar results.

For more information about the CALENDAR system view, see Data Dictionary.

Example  

If the current date is January 10, 1901, the following queries return the value 53 as the result since January 10, 1901 falls on the 53rd week since January 01, 1900.

   SELECT td_week_of_calendar(CURRENT_DATE);

   SELECT td_week_of_calendar(DATE '1901-01-10');