Definition:
INTERVAL DAY TO SECOND is an interval literal that stores a period of time using days, hours, minutes, and seconds.
An interval literal specifies a period of time, and Oracle supports two types of interval literals: YEAR_TO_MONTH and DAY TO SECOND. For DAY TO SECOND, you can specify these differences in terms in terms of days, hours, minutes, and seconds. DAY TO SECOND contains a leading field and may contain an optional trailing field. If trailing field is specified it must be less significant than the leading field. For example, INTERVAL MINUTE TO DAY is not valid.
A DAY TO MINUTE interval considers an interval of days to the nearest minute.
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