Argument Types and Rules - Analytics Database - Teradata Vantage

SQL Date and Time Functions and Expressions

Deployment
VantageCloud
VantageCore
Edition
Enterprise
IntelliFlex
VMware
Product
Analytics Database
Teradata Vantage
Release Number
17.20
Published
June 2022
Language
English (United States)
Last Update
2023-10-30
dita:mapPath
cpk1628111786971.ditamap
dita:ditavalPath
qkf1628213546010.ditaval
dita:id
pxz1544241488545
lifecycle
latest
Product Category
Teradata Vantage™
Expressions passed to this function must have the following data types:
  • date_timestamp_value = DATE, TIMESTAMP, or TIMESTAMP WITH TIME ZONE
  • num_months = INTEGER

For the num_months argument, you can also pass values with data types that can be converted to INTEGER using the implicit data type conversion rules that apply to UDFs. Implicit type conversion is not supported for the date_timestamp_value argument.

The UDF implicit type conversion rules are more restrictive than the implicit type conversion rules normally used by Vantage. If an argument cannot be converted to the required data type following the UDF implicit conversion rules, it must be explicitly cast.

For details, see Teradata Vantage™ - SQL External Routine Programming, B035-1147.

Since TIMESTAMP values are stored in UTC time within the database and lack a time zone, the session time zone is used to interpret the time stamp value within the function. For TIMESTAMP WITH TIME ZONE values, the time zone component is used to interpret the time stamp value within the function.

If the day component of date_timestamp_value is the last day of the month, or if the resulting month has fewer days than the day component of date_timestamp_value, OADD_MONTHS returns the last day of the resulting month. Otherwise, OADD_MONTHS returns a value that has the same day component as date_timestamp_value.

The difference between OADD_MONTHS and ADD_MONTHS is that if a month is added to an end-of-month date in OADD_MONTHS, the function always returns an end-of-month date. The following queries illustrate the difference between ADD_MONTHS and OADD_MONTHS:
  • This query:
    SELECT ADD_MONTHS ('2008-02-29', 1);

    returns '08/03/29'

  • This query:
    SELECT OADD_MONTHS ('2008-02-29', 1);

    returns '08/03/31'