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## timestamp_diff function

The `timestamp_diff` function returns the number of milliseconds between two timestamp values. The result type is `LONG`.

Syntax:

    LONG timestamp_diff(TIMESTAMP timestamp1, TIMESTAMP timestamp2

Semantics:

- timestamp1: A TIMESTAMP value or a value that can be cast to TIMESTAMP
- timestamp2: A TIMESTAMP value or a value that can be cast to TIMESTAMP
- Return Value: LONG

Example 12-9 What is the duration between the time the baggage was boarded at one leg and reached the next leg for the passenger with ticket number 1762355527825?

To determine the duration in milliseconds, use the `timestamp_diff` function.

    SELECT $bagInfo.bagArrivalDate, $flightLeg.flightDate,
    timestamp_diff($bagInfo.bagArrivalDate, $flightLeg.flightDate) AS diff
    FROM baggageinfo $s,
    $s.bagInfo[] AS $bagInfo, $bagInfo.flightLegs[] AS $flightLeg
    WHERE ticketNo=1762355527825

Explanation: In an airline application every customer can have different number of hops/legs between their source and destination. In this query, you determine the time taken between every flight leg. This is determined by the difference between `bagArrivalDate` and `flightDate` for every flight leg.

Output:

    {"bagArrivalDate":"2019-03-22T10:17:00Z","flightDate":"2019-03-22T07:00:00Z","diff":11820000}
    {"bagArrivalDate":"2019-03-22T10:17:00Z","flightDate":"2019-03-22T07:23:00Z","diff":10440000}
    {"bagArrivalDate":"2019-03-22T10:17:00Z","flightDate":"2019-03-22T08:23:00Z","diff":6840000}

Example 12-10 How long does it take from the time of check-in to the time the bag is scanned at the point of boarding for the passenger with ticket number 176234463813?

To determine the duration in milliseconds, use the `timestamp_diff` function.

    SELECT $flightLeg.flightNo,
    $flightLeg.actions[contains($element.actionCode, "Checkin")].actionTime AS checkinTime,
    $flightLeg.actions[contains($element.actionCode, "BagTag Scan")].actionTime AS bagScanTime,
    timestamp_diff(
      $flightLeg.actions[contains($element.actionCode, "Checkin")].actionTime,
      $flightLeg.actions[contains($element.actionCode, "BagTag Scan")].actionTime
    ) AS diff
    FROM baggageinfo $s,
    $s.bagInfo[].flightLegs[] AS $flightLeg
    WHERE ticketNo=176234463813 AND starts_with($s.bagInfo[].routing, $flightLeg.fltRouteSrc)

Explanation: In the baggage data, every `flightLeg` has an `actions` array. There are three different actions in the `actions` array. The action code for the first element in the array is `Checkin/Offload`. For the first leg, the action code is `Checkin` and for the other legs, the action code is `Offload at the hop` . The action code for the second element of the array is `BagTag Scan`. In the query above, you determine the difference in action time between the bag tag scan and check-in time. You use the `contains` function to filter the action time only if the action code is Checkin or BagScan. Since only the first flight leg has details of check-in and bag scan, you additionally filter the data using `starts_with` function to fetch only the source code `fltRouteSrc`.

Output:

    {"flightNo":"BM572","checkinTime":"2019-03-02T03:28:00Z","bagScanTime":"2019-03-02T04:52:00Z","diff":-5040000}

Example 12-11 How long does it take for the bags of a customer with ticket no 1762320369957 to reach the first transit point?

To determine the duration in milliseconds, use the `timestamp_diff` function.

    SELECT  $bagInfo.flightLegs[0].flightDate,
    $bagInfo.flightLegs[0].estimatedArrival,
    timestamp_diff($bagInfo.flightLegs[0].estimatedArrival,
    $bagInfo.flightLegs[0].flightDate) AS diff
    FROM baggageinfo $s, $s.bagInfo[] AS $bagInfo
    WHERE ticketNo=1762320369957

Explanation: In an airline application every customer can have different number of hops/legs between their source and destination. In the example above, you determine the time taken for the bag to reach the first transit point. In the baggage data, the `flightLeg` is an array. The first record in the array refers to the first transit point details. The `flightDate` in the first record is the time when the bag leaves the source and the `estimatedArrival` in the first flight leg record indicates the time it reaches the first transit point. The difference between the two gives the time taken for the bag to reach the first transit point.

Output:

    {"flightDate":"2019-03-12T03:00:00Z","estimatedArrival":"2019-03-12T16:00:00Z","diff":46800000}
    {"flightDate":"2019-03-12T03:00:00Z","estimatedArrival":"2019-03-12T16:40:00Z","diff":49200000}