DSINTERVAL Data Type

DSINTERVAL corresponds to the SQL INTERVAL DAY TO SECOND data type. It stores a period of time in terms of days, hours, minutes, and seconds. This data type is useful for representing the precise difference between two datetime values.

Specify DSINTERVAL interval literals using the following syntax.

INTERVAL 'integer|integer time_expr|time_expr

DAY|HOUR|MINUTE [(leading_precision)] | SECOND [leading_precision[, fractional_seconds_precision ])]

[ TO DAY|HOUR|MINUTE|SECOND [(fractional_seconds_precision) ]]

where

integer specifies the number of days. If this value contains more digits than the number specified by the leading precision, then Oracle returns an error.
time_expr specifies a time in the format HH[:MI[:SS[.n]]] or MI[:SS[.n]] or SS[.n], where n specifies the fractional part of a second. If n contains more digits than the number specified by fractional_seconds_precision, then n is rounded to the number of digits specified by the fractional_seconds_precision value. You can specify time_expr following an integer and a space only if the leading field is DAY.
leading_precision is the number of digits in the leading field. Accepted values are 0 to 9. The default is 2.
fractional_seconds_precision is the number of digits in the fractional part of the SECOND datetime field. Accepted values are 1 to 9. The default is 6.

If you specify a trailing field, it must be less significant than the leading field. For example, INTERVAL MINUTE TO DAY is not valid. Because of this restriction, if SECOND is the leading field, the interval literal cannot have any trailing field.

The valid range of values for the trailing field are as follows:

HOUR: 0 to 23
MINUTE: 0 to 59
SECOND: 0 to 59.999999999

Examples of the various forms of DSINTERVAL literals follow, including some abbreviated versions:

Form of Interval Literal	Interpretation
`INTERVAL '4 5:12:10.222' DAY TO SECOND(3)`	4 days, 5 hours, 12 minutes, 10 seconds, and 222 thousandths of a second.
`INTERVAL '4 5:12' DAY TO MINUTE`	4 days, 5 hours and 12 minutes.
`INTERVAL '400 5' DAY(3) TO HOUR`	400 days 5 hours.
`INTERVAL '400' DAY(3)`	400 days.
`INTERVAL '11:12:10.2222222' HOUR TO SECOND(7)`	11 hours, 12 minutes, and 10.2222222 seconds.
`INTERVAL '11:20' HOUR TO MINUTE`	11 hours and 20 minutes.
`INTERVAL '10' HOUR`	10 hours.
`INTERVAL '10:22' MINUTE TO SECOND`	10 minutes 22 seconds.
`INTERVAL '10' MINUTE`	10 minutes.
`INTERVAL '4' DAY`	4 days.
`INTERVAL '25' HOUR`	25 hours.
`INTERVAL '40' MINUTE`	40 minutes.
`INTERVAL '120' HOUR(3)`	120 hours.
`INTERVAL '30.12345' SECOND(2,4)`	30.1235 seconds. The fractional second '12345' is rounded to '1235' because the precision is 4.

You can add or subtract one DAY TO SECOND interval literal from another DAY TO SECOND literal. For example.

INTERVAL'20' DAY - INTERVAL'240' HOUR = INTERVAL'10-0' DAY TO SECOND