如果一個(gè)表包含 STRUCT 的 ARRAY，則可展平 ARRAY 以查詢 STRUCT 的字段。您也可以展平 STRUCT 值的 ARRAY 類型字段。

查詢 ARRAY 中的 STRUCT 元素
以下示例將 UNNEST 與 CROSS JOIN 結(jié)合使用，以展平 STRUCT 的 ARRAY。

WITH races AS (SELECT "800M" AS race,[STRUCT("Rudisha" as name, [23.4, 26.3, 26.4, 26.1] as splits),STRUCT("Makhloufi" as name, [24.5, 25.4, 26.6, 26.1] as splits),STRUCT("Murphy" as name, [23.9, 26.0, 27.0, 26.0] as splits),STRUCT("Bosse" as name, [23.6, 26.2, 26.5, 27.1] as splits),STRUCT("Rotich" as name, [24.7, 25.6, 26.9, 26.4] as splits),STRUCT("Lewandowski" as name, [25.0, 25.7, 26.3, 27.2] as splits),STRUCT("Kipketer" as name, [23.2, 26.1, 27.3, 29.4] as splits),STRUCT("Berian" as name, [23.7, 26.1, 27.0, 29.3] as splits)]AS participants) SELECTrace,participant FROM races r CROSS JOIN UNNEST(r.participants) as participant;+------+---------------------------------------+ | race | participant | +------+---------------------------------------+ | 800M | {Rudisha, [23.4, 26.3, 26.4, 26.1]} | | 800M | {Makhloufi, [24.5, 25.4, 26.6, 26.1]} | | 800M | {Murphy, [23.9, 26, 27, 26]} | | 800M | {Bosse, [23.6, 26.2, 26.5, 27.1]} | | 800M | {Rotich, [24.7, 25.6, 26.9, 26.4]} | | 800M | {Lewandowski, [25, 25.7, 26.3, 27.2]} | | 800M | {Kipketer, [23.2, 26.1, 27.3, 29.4]} | | 800M | {Berian, [23.7, 26.1, 27, 29.3]} | +------+---------------------------------------+ WITH races AS (SELECT "800M" AS race,[STRUCT("Rudisha" as name, [23.4, 26.3, 26.4, 26.1] as splits),STRUCT("Makhloufi" as name, [24.5, 25.4, 26.6, 26.1] as splits),STRUCT("Murphy" as name, [23.9, 26.0, 27.0, 26.0] as splits),STRUCT("Bosse" as name, [23.6, 26.2, 26.5, 27.1] as splits),STRUCT("Rotich" as name, [24.7, 25.6, 26.9, 26.4] as splits),STRUCT("Lewandowski" as name, [25.0, 25.7, 26.3, 27.2] as splits),STRUCT("Kipketer" as name, [23.2, 26.1, 27.3, 29.4] as splits),STRUCT("Berian" as name, [23.7, 26.1, 27.0, 29.3] as splits)]AS participants) SELECTrace,(SELECT nameFROM UNNEST(participants)ORDER BY (SELECT SUM(duration)FROM UNNEST(splits) AS duration) ASCLIMIT 1) AS fastest_racer FROM races;+------+---------------+ | race | fastest_racer | +------+---------------+ | 800M | Rudisha | +------+---------------+

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