td_week_of_year - Teradata Database

td_week_of_year

Purpose  

Returns the nth full week from the beginning of the year (January 1st) 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_year 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 from 0 to 53, representing the nth full week from the beginning of the year, where the first partial week is 0.

Usage Notes

The td_week_of_year 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 May 04, 2010, the following queries return the value 18 as the result since May 04, 2010 falls on the 18th week of the year.

   SELECT td_week_of_year(CURRENT_DATE);

   SELECT td_week_of_year(DATE '2010-05-04');