MonthNumber_Of_Year - Teradata Database

MonthNumber_Of_Year

Purpose  

Returns the number of months from the beginning of the year to the specified date.

Syntax  

Syntax Elements

calendar_name

A calendar name. The possible values are Teradata, ISO, and COMPATIBLE.

This argument must be a character literal and cannot be a table column or expression. If you do not name a calendar, Teradata uses the calendar for the session.

expression

An expression that results in a DATE, TIMESTAMP, or TIMESTAMP WITH TIME ZONE value.

NULL

The business calendar for the session.

TD_SYSFNLIB

Name of the database where the function is located.

ANSI Compliance

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

Argument Types

The first argument, expression, is defined with the following data types:

DATE

TIMESTAMP

TIMESTAMP WITH TIME ZONE

The second argument, calendar_name, is optional and is defined with the following argument data types:

VARCHAR

NULL

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.

Result

The result is an INTEGER value between 1 and 12, representing the nth month of the year.

Usage Notes

The MonthNumber_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 March 15, 2011, the following query returns 3 because March 15, 2011, is in the third month of the Teradata calendar:

   SELECT TD_SYSFNLIB.MONTHNUMBER_OF_YEAR(CURRENT_DATE);

The following query returns 3 because March 15, 2011, is in the third month of the ISO calendar:

   SELECT TD_SYSFNLIB.MONTHNUMBER_OF_YEAR(DATE '2011-03-15', ’ISO’);