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Adding to datetime in Update Query


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I want to run a query to update my 'journey' table. The table contain a list of individual journeys that make up the overall trip('shuttle'). I want to add departure times for each individual journey, these are based on the overall shuttle departure time.

For example for the second part of the journey I would set the journey departure time to be 45 minutes after the initial shuttle departure:


UPDATE journey, shuttle

SET    journey_dttm = shuttle.depart_dttm *+45 Minutes*

WHERE journey.shuttle_id = shuttle.id

AND   journey.route_id = '2'


However I am not sure how I should format the set part of my query?

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