TIMESTAMP-to-DATE Conversion Syntax | VantageCloud Lake - Teradata TIMESTAMP-to-DATE Conversion Syntax - Teradata VantageCloud Lake

ANSI Compliance

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

The AT clause is ANSI SQL:2011 compliant.

As an extension to ANSI, the AT clause is supported when using Teradata conversion syntax to convert from TIMESTAMP to DATE. In addition, you can specify the time zone displacement using additional expressions besides an INTERVAL expression.

Syntax

timestamp_expression (
  [ data_attribute [,...] ] DATE
  
  [ AT { LOCAL | SOURCE [ TIME ZONE ] |
         [ TIME ZONE ] { expression | time_zone_string }
       }
  ]
  
  [, data_attribute [,...] ]
)

Syntax Elements

timestamp_expression

The timestamp expression to be converted.

data_attribute

One of the following data attributes:

• FORMAT
• NAMED
• TITLE

AT LOCAL

Use the time zone displacement based on the current session time zone.

AT SOURCE [TIME ZONE]

Use the time zone associated with timestamp_expression when:

• AT SOURCE TIME ZONE is specified.
• AT SOURCE is specified without TIME ZONE and there is no column named source in the scope.

Otherwise, if AT SOURCE is specified without TIME ZONE and a column named source exists, then SOURCE references this column, and the value of the column is used as the time zone displacement for the CAST. If needed, the column value is implicitly converted to type INTERVAL HOUR(2) TO MINUTE.

AT [TIME ZONE] expression

Use the time zone displacement defined by expression.

The data type of expression must be INTERVAL HOUR(2) TO MINUTE or it must be a data type that can be implicitly converted to INTERVAL HOUR(2) TO MINUTE.

AT [TIME ZONE] time_zone_string

time_zone_string determines the time zone displacement.