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sqlEventsDelta 1st solution #342

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17 changes: 17 additions & 0 deletions Codility/SQL/SqlEventsDelta.sql
Original file line number Diff line number Diff line change
@@ -0,0 +1,17 @@
-- write your code in PostgreSQL 9.4
SELECT e1.event_type, (e1.value - e2.value) as value
FROM events e1
INNER JOIN events e2 ON e1.event_type = e2.event_type
AND e1.time = (
SELECT temp1.time
from events temp1
WHERE temp1.event_type = e1.event_type
ORDER BY temp1.time DESC
LIMIT 1)
AND e2.time = (
SELECT temp2.time
FROM events temp2
WHERE temp2.event_type = e2.event_type
ORDER BY temp2.time
DESC LIMIT 1 OFFSET 1
);