PostgreSQL MIN 和 MAX 函数
MIN
MIN() 函数返回所选列的最小值。
MAX
MAX() 函数返回所选列的最大值。
设置列名
当您使用 MIN() 或 MAX() 时，返回的列默认命名为 min 或 max。要为列指定新名称，请使用 AS 关键字。
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