PostgreSQL/SQL/日付・時刻関連/月別の集計を出すのバックアップ(No.1)

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PostgreSQL/SQL/日付・時刻関連/月別の集計を出すへ行く。
- 1 (2009-10-29 (木) 18:34:06)

月別の集計を出す

 SELECT
       SUM(CASE WHEN EXTRACT(MONTH FROM dt) = 1  THEN num ELSE 0 END) AS DT200801,
       SUM(CASE WHEN EXTRACT(MONTH FROM dt) = 2  THEN num ELSE 0 END) AS DT200802,
       SUM(CASE WHEN EXTRACT(MONTH FROM dt) = 3  THEN num ELSE 0 END) AS DT200803,
       SUM(CASE WHEN EXTRACT(MONTH FROM dt) = 4  THEN num ELSE 0 END) AS DT200804,
       SUM(CASE WHEN EXTRACT(MONTH FROM dt) = 5  THEN num ELSE 0 END) AS DT200805,
       SUM(CASE WHEN EXTRACT(MONTH FROM dt) = 6  THEN num ELSE 0 END) AS DT200806,
       SUM(CASE WHEN EXTRACT(MONTH FROM dt) = 7  THEN num ELSE 0 END) AS DT200807,
       SUM(CASE WHEN EXTRACT(MONTH FROM dt) = 8  THEN num ELSE 0 END) AS DT200808,
       SUM(CASE WHEN EXTRACT(MONTH FROM dt) = 9  THEN num ELSE 0 END) AS DT200809,
       SUM(CASE WHEN EXTRACT(MONTH FROM dt) = 10 THEN num ELSE 0 END) AS DT200810,
       SUM(CASE WHEN EXTRACT(MONTH FROM dt) = 11 THEN num ELSE 0 END) AS DT200811,
       SUM(CASE WHEN EXTRACT(MONTH FROM dt) = 12 THEN num ELSE 0 END) AS DT200812
 FROM  t1
 WHERE dt >= '2008-01-01' AND dt <= '2008-12-31'