Question

我正在尝试在SQL postgres中选择特定日期范围内的特定时间范围。请看下面的代码，它在'10：00：00'给出错误。每列的数据类型是： “余额”的数字，字符变化（255）为“货币”， “created_at”没有时区的时间戳（例如：2018-03-20 00:00:00）。

我尝试了此链接但没有成功。 MySQL select based on daily timestamp range

SELECT SUM(bl.balance) AS balance, bl.currency, bl.created_at
  FROM balance_logs bl
  WHERE bl.balance_scope = 'system' AND
        created_at >= CURRENT_DATE - 2 AND
        created_at < CURRENT_DATE AND
        created_at BETWEEN '10:00:00' AND '11:00:00'
  GROUP BY bl.currency, bl.created_at
  ORDER BY created_at DESC

Answer 1

比较需要时间：

SELECT SUM(bl.balance) AS balance, bl.currency, bl.created_at
FROM balance_logs bl
WHERE bl.balance_scope = 'system' AND
      created_at >= CURRENT_DATE - 2 AND
      created_at < CURRENT_DATE AND
      created_at::time BETWEEN '10:00:00'::time AND '11:00:00'::time
GROUP BY bl.currency, bl.created_at
ORDER BY created_at DESC;

但是，我认为最好将WHERE条件写为：

      extract(hour from created_at) = 10

在SQL中选择时间戳范围

1 个答案: