15.00 - td_week_of_calendar - Teradata Database

Teradata Database SQL Functions, Operators, Expressions, and Predicates

Product
Teradata Database
Release Number
15.00
Content Type
Programming Reference
Publication ID
B035-1145-015K
Language
English (United States)
Last Update
2018-09-24

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');