EXTRACT() 提取函数

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EXTRACT() 函数用于提取日期/时间的单独部分，比如年、月、日、小时、分钟等等。
示例：

select created_at,
       EXTRACT (YEAR FROM created_at) AS year,
       EXTRACT (MONTH FROM created_at) AS month,
       EXTRACT (DAY FROM created_at) AS day,
       EXTRACT (HOUR FROM created_at) AS hour,
       EXTRACT (MINUTE FROM created_at) AS MINUTE,
       EXTRACT (SECOND FROM created_at) AS SECOND
       from company_contract