Identifies a field as an INTERVAL value defining a period of time in days and hours.
Syntax
INTERVAL DAY [ ( precision ) ] TO HOUR [ attributes [...] ]
- precision
- The permitted range of digits for DAY, ranging from one to four.
- attributes
- Appropriate data type, column storage, or column constraint attributes.
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' |
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);