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DB M G

Introduction to databases

Triggers - Exercise

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DB M G

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Triggers

The following relations are given (primary keys are underlined, optional attributes are denoted with *):

ATHLETE(AthleteCode, TeamName) ATHLETE_ARRIVAL(AthleteCode, Time)

TEAM_ARRIVAL(TeamName, NumberArrivedAthletes) RANKING(AthleteCode, Position, Time)

Write triggers to

update TEAM_ARRIVAL and RANKING tables

when a new row is inserted in ATHLETE_ARRIVAL table. For the update of the

TEAM_ARRIVAL table, consider also the case of a team not yet inserted in the table. For the update of RANKING table, consider that the Time field can assume the same value for two different athletes.

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