Declares an INTERVAL HOUR value in an expression.
Result type: INTERVAL HOUR Data Type
ANSI Compliance
INTERVAL HOUR literals are partly ANSI SQL:2011 compliant.
The ANSI definition places the optional sign within the apostrophes; the Teradata implementation places the optional sign outside the apostrophes.
Syntax
INTERVAL [ sign ] 'string' HOUR
Syntax Elements
- sign
- An optional minus sign to indicate a negative interval. The default is a positive interval.
- string
- One to four digits representing the number of hours. Spaces and new line characters are not allowed between the apostrophes.Only digits within the apostrophes are parsed and converted to numeric. For example, '1.05' is treated as '105'.
Example: INTERVAL HOUR Literal
This example subtracts an interval of 2000 hours from the current system timestamp.
SELECT CURRENT_TIMESTAMP - INTERVAL '2000' HOUR;
Result:
(Current TimeStamp(6)- 2000) -------------------------------- 2003-01-28 09:27:08.180000+00:00