Interval

The family of data types representing time and date intervals. The resulting types of the INTERVAL operator.

Structure:

  • Time interval as an unsigned integer value.
  • Type of an interval.

Supported interval types:

  • NANOSECOND
  • MICROSECOND
  • MILLISECOND
  • SECOND
  • MINUTE
  • HOUR
  • DAY
  • WEEK
  • MONTH
  • QUARTER
  • YEAR

For each interval type, there is a separate data type. For example, the DAY interval corresponds to the IntervalDay data type:

SELECT toTypeName(INTERVAL 4 DAY)

┌─toTypeName(toIntervalDay(4))─┐
│ IntervalDay                  │
└──────────────────────────────┘

Considerations

You can use Interval-type values in arithmetical operations with Date and DateTime-type values. For example, you can add 4 days to the current time:

SELECT now() as current_date_time, current_date_time + INTERVAL 4 DAY

┌───current_date_time─┬─plus(now(), toIntervalDay(4))─┐
│ 2019-10-23 10:58:45 │           2019-10-27 10:58:45 │
└─────────────────────┴───────────────────────────────┘

You can use multiple intervals simultaneously:

SELECT now() AS current_date_time, current_date_time + (INTERVAL 4 DAY + INTERVAL 3 HOUR)

┌───current_date_time─┬─plus(current_date_time, plus(toIntervalDay(4), toIntervalHour(3)))─┐
│ 2024-08-08 18:31:39 │                                                2024-08-12 21:31:39 │
└─────────────────────┴────────────────────────────────────────────────────────────────────┘

And to compare values with different intervals:

SELECT toIntervalMicrosecond(3600000000) = toIntervalHour(1);

┌─less(toIntervalMicrosecond(179999999), toIntervalMinute(3))─┐
│                                                           1 │
└─────────────────────────────────────────────────────────────┘
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