Identifies a field as an INTERVAL value defining a period of time in years and months.
INTERVAL YEAR TO MONTH is ANSI SQL:2011 compliant.
Internal Representation of INTERVAL YEAR TO MONTH
Conceptually, INTERVAL YEAR TO MONTH is a record with two fields.
|Field Name||Storage Format||Total Length|
External Representation of INTERNAL YEAR TO MONTH
INTERVAL YEAR TO MONTH types are imported and exported in record and indicator modes as CHARACTER data using the client character set.
|CHARACTER(precision + 4)||'-y(precision)-mm'|
An example value for INTERVAL YEAR(3) TO MONTH is ' 013-11'.
Range of Values
The range of values for the INTERVAL YEAR TO MONTH is as follows.
|Type and Precision||Minimum Value||Maximum Value|
|INTERVAL YEAR(1) TO MONTH||-'9-11'||'9-11'|
|INTERVAL YEAR(2) TO MONTH||-'99-11'||'99-11'|
|INTERVAL YEAR(3) TO MONTH||-'999-11'||'999-11'|
|INTERVAL YEAR(4) TO MONTH||-'9999-11'||'9999-11'|
Implicit and Explicit INTERVAL YEAR TO MONTH 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 YEAR TO MONTH Data Type
The following statement creates a table with an INTERVAL YEAR TO MONTH column:
CREATE TABLE TimeInfo (Id INTEGER ,Offset INTERVAL YEAR (4) TO MONTH);