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sql 精读(四) 标准 SQL 中聚合分析功能示例
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sql 精读(四) 标准 SQL 中聚合分析功能示例
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求和
WITH Produce AS(SELECT 'kale' as item, 23 as purchases, 'vegetable' as categoryUNION ALL SELECT 'orange', 2, 'fruit'UNION ALL SELECT 'cabbage', 9, 'vegetable'UNION ALL SELECT 'apple', 8, 'fruit'UNION ALL SELECT 'leek', 2, 'vegetable'UNION ALL SELECT 'lettuce', 10, 'vegetable') SELECT item, purchases, category, SUM(purchases)OVER () AS total_purchases FROM Produce; +-------------------------------------------------------+ | item | purchases | category | total_purchases | +-------------------------------------------------------+ | orange | 2 | fruit | 54 | | leek | 2 | vegetable | 54 | | apple | 8 | fruit | 54 | | cabbage | 9 | vegetable | 54 | | lettuce | 10 | vegetable | 54 | | kale | 23 | vegetable | 54 | +-------------------------------------------------------+小計(jì)
WITH Produce AS(SELECT 'kale' as item, 23 as purchases, 'vegetable' as categoryUNION ALL SELECT 'orange', 2, 'fruit'UNION ALL SELECT 'cabbage', 9, 'vegetable'UNION ALL SELECT 'apple', 8, 'fruit'UNION ALL SELECT 'leek', 2, 'vegetable'UNION ALL SELECT 'lettuce', 10, 'vegetable') SELECT item, purchases, category, SUM(purchases)OVER (PARTITION BY categoryORDER BY purchasesROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING) AS total_purchases FROM Produce +-------------------------------------------------------+ | item | purchases | category | total_purchases | +-------------------------------------------------------+ | orange | 2 | fruit | 10 | | apple | 8 | fruit | 10 | | leek | 2 | vegetable | 44 | | cabbage | 9 | vegetable | 44 | | lettuce | 10 | vegetable | 44 | | kale | 23 | vegetable | 44 | +-------------------------------------------------------+累計(jì)求和
WITH Produce AS(SELECT 'kale' as item, 23 as purchases, 'vegetable' as categoryUNION ALL SELECT 'orange', 2, 'fruit'UNION ALL SELECT 'cabbage', 9, 'vegetable'UNION ALL SELECT 'apple', 8, 'fruit'UNION ALL SELECT 'leek', 2, 'vegetable'UNION ALL SELECT 'lettuce', 10, 'vegetable') SELECT item, purchases, category, SUM(purchases)OVER (PARTITION BY categoryORDER BY purchasesROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW--ROWS BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING) AS total_purchases FROM Produce +-------------------------------------------------------+ | item | purchases | category | total_purchases | +-------------------------------------------------------+ | orange | 2 | fruit | 2 | | apple | 8 | fruit | 10 | | leek | 2 | vegetable | 2 | | cabbage | 9 | vegetable | 11 | | lettuce | 10 | vegetable | 21 | | kale | 23 | vegetable | 44 | +-------------------------------------------------------+總結(jié)
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