Transcription of SQL Window Functions Cheat Sheet (A4)
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SQL Window Functions Cheat Sheet (A4)
Monthcitysold1 Rome2002 Paris5001 London1001 Paris3002 Rome3002 London4003 Rome400 AbbreviationMeaningUNBOUNDED PRECEDINGBETWEEN UNBOUNDED PRECEDING AND CURRENT ROWn PRECEDINGBETWEEN n PRECEDING AND CURRENT ROWCURRENT ROWBETWEEN CURRENT ROW AND CURRENT ROWn FOLLOWINGBETWEEN AND CURRENT ROW AND n FOLLOWINGUNBOUNDED FOLLOWINGBETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING soldcitymonth200 Rome1500 Paris2100 London1300 Paris1300 Rome2400 London2400 Rome3soldcitymonth300 Paris1500 Paris2200 Rome1300 Rome2400 Rome3100 London1400 London2 Window Functions compute their result based on a sliding Window frame, a set of rows that are somehow related to the current BY divides rows into multiple groups, called partitions, to which the Window function is applied.
SQL Window Functions Cheat Sheet city monthsold Paris1 500 Paris 2 300 Paris 3 400 Rome 2 200 Rome 3 300 Rome 4 500 Rome 5300 London 1 100 nth_value 300 300 300 300 300 300 300 NULL nth_value(sold, 2) OVER (PARTITION BY city ORDER BY month RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING) month sold 1 500 2 300
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