Period-to-DATE Conversion - Teradata Database

Period-to-DATE Conversion

Purpose

Converts Period data to a DATE value.

CAST Syntax

where:

Syntax element …	Specifies …
period_expression	the Period data expression to be cast to a DATE type.
date_data_attribute	one of the following optional data attributes: FORMAT NAMED TITLE

ANSI Compliance

This is ANSI SQL:2011 compliant.

As an extension to ANSI, CAST permits the use of DATE data attribute phrases.

Usage Notes

A PERIOD(DATE) or PERIOD(TIMESTAMP(n) [WITH TIME ZONE]) value can be cast as DATE using the CAST function. The source last value must be equal to the source beginning bound; otherwise, an error is reported.

If the source type is PERIOD(DATE), the result is the source beginning bound.

If the source type is PERIOD(TIMESTAMP(n) [WITH TIME ZONE]), the result is the date portion of the source beginning bound after adjusting to the current session time zone.

If the source type is PERIOD(TIME(n) [WITH TIME ZONE]), an error is reported.

Example  

Assume pd is a PERIOD(DATE) column in table t with a value of
PERIOD '(2005-02-02, 2005-02-03)'.

In the following example, a PERIOD(DATE) column is cast as DATE. The result is the beginning bound of the column.

   SELECT CAST(pd AS DATE) FROM t;

The following is returned:

   2005-02-02

Related Topics

For details on data types and data attributes, see SQL Data Types and Literals.