>>-HOUR--(--expression--)--------------------------------------><
The HOUR function returns the hour part of a value.
An expression that returns a value of
one of the following built-in data types: a DATE, a TIME, a TIMESTAMP,
a character string, or an exact numeric data type.
- If expression is a character string,
it must not be a CLOB and its value must be a valid string representation
of a datetime value. For the valid formats of string representations
of datetime values, see "String representations of datetime values" in "Datetime
values".
- If expression is an exact numeric value,
it must be a time duration or timestamp duration. For information
about valid time durations and timestamp durations, see "Datetime
operands and durations".
- Only Unicode databases support an expression that is a valid graphic
string representation of a datetime value that is not a DBCLOB. The
graphic string is converted to a character string before the function
is executed.
The result of the function is a large integer. If the
argument can be null, the result can be null; if the argument is null,
the result is the null value.
The other rules depend on the data type of the argument:
- If the argument is a TIME, TIMESTAMP or valid
string representation of a time or timestamp:
- The result is the hour part of the value, which is an integer
between 0 and 24.
- If the argument is a DATE or valid string representation
of a date:
- If the argument is a time duration or timestamp duration:
- The result is the hour part of the value, which is an integer
between -99 and 99. A nonzero result has the same sign as the argument.
Example
Using the CL_SCHED sample table,
select all the classes that start in the afternoon.
SELECT * FROM CL_SCHED
WHERE HOUR(STARTING) BETWEEN 12 AND 17
DB2 Version 9.7 for Linux, UNIX, and Windows