| 1 | create function UpdateLastMaintenance()
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| 2 | returns trigger as $$
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| 3 | declare
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| 4 | LastMaintenanceDate timestamp;
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| 5 | begin
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| 6 | select m.date into LastMaintenanceDate
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| 7 | from maintenance m
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| 8 | join airplane a on a.lastmaintenanceid = m.id
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| 9 | where a.id = new.airplaneid;
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| 10 |
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| 11 | if LastMaintenanceDate is null or LastMaintenanceDate <= new.date then
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| 12 | update airplane
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| 13 | set lastmaintenanceid = new.id
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| 14 | where id = new.airplaneid;
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| 15 | end if;
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| 16 |
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| 17 | return new;
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| 18 | end;
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| 19 | $$ language plpgsql;
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| 20 |
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| 21 | create trigger UpdateLastMaintenance
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| 22 | after insert on maintenance
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| 23 | for each row execute function UpdateLastMaintenance(); |
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