PostgreSQL分組（GROUP BY子句）

PostgreSQL分組（GROUP BY子句） select u.created_ts, count(*) from tb_user u group by u.created_ts 注意：不能缺少聚合函數 按月分組統計 select to_char(to_timestamp(created_ts/1000), ‘YYYY-MM’) as month, count(id) as total_cal

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