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[FORMAT_TIMESTAMP](https://cloud.google.com/bigquery/docs/reference/standard-sql/functions-and-operators?hl=ja#format_timestamp)で対応できます。
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追記
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--
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以下で出来ませんか？
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```SQL
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SELECT FORMAT_TIMESTAMP('%Y-%m-%d',B02_Time)
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FROM テーブル
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GROUP BY FORMAT_TIMESTAMP('%Y-%m-%d',B02_Time)
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ORDER BY FORMAT_TIMESTAMP('%Y-%m-%d',B02_Time) desc
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```
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