INTERVAL DAY TO HOUR Data Type - Teradata Vantage NewSQL Engine - 16.20

Teradata Vantage™ Data Types and Literals

prodname
Teradata Database
Teradata Vantage NewSQL Engine
vrm_release
16.20
category
Programming Reference
featnum
B035-1143-162K

Purpose

Identifies a field as an INTERVAL value defining a period of time in days and hours.

Syntax



precision
The permitted range of digits for DAY, ranging from one to four.
The default is two.
attributes
Appropriate data type, column storage, or column constraint attributes.
See Core Data Type Attributes and Storage and Constraint Attributes for specific information.

ANSI Compliance

INTERVAL DAY TO HOUR is ANSI SQL:2011 compliant.

Internal Representation of INTERVAL DAY TO HOUR

Conceptually, INTERVAL DAY TO HOUR is a record with the following fields.

Field Name Storage Format Total Length
DAY SMALLINT 4 bytes
HOUR SMALLINT

External Representation of INTERVAL DAY TO HOUR

INTERVAL DAY TO HOUR types are imported and exported in record and indicator modes as CHARACTER data using the client character set.

Type Format
CHARACTER(precision + 4) '-d(precision) hh'

An example value of INTERVAL DAY (2) TO HOUR is ' 17 11'.

Range of Values

The range of values for INTERVAL DAY TO HOUR is as follows.

Type and Precision Minimum Value Maximum Value
INTERVAL DAY(1) TO HOUR -'9 23' '9 23'
INTERVAL DAY(2) TO HOUR -'99 23' '99 23'
INTERVAL DAY(3) TO HOUR -'999 23' '999 23'
INTERVAL DAY(4) TO HOUR -'9999 23' '9999 23'
Decimal values are not allowed for Interval data types except for second intervals.

Implicit and Explicit INTERVAL DAY TO HOUR Conversion

Teradata Database performs implicit conversion from one Interval data type to another Interval type in some cases. You can also use CAST to explicitly convert one Interval type to another.

Conversions are possible only within the same INTERVAL family. For example, you may convert a YEAR interval to months, but not to days or hours.

For more information, see “Data Type Conversions” in Teradata Vantage™ SQL Functions, Expressions, and Predicates, B035-1145.

Example: INTERVAL DAY TO HOUR Data Type

The following statement creates a table with an INTERVAL DAY TO HOUR column:

CREATE TABLE TimeInfo
  (Id INTEGER
  ,Offset INTERVAL DAY (4) TO HOUR);