我需要为 Oracle 日期列中的值添加 30 分钟.我通过指定
I need to add 30 minutes to values in a Oracle date column. I do this in my SELECT statement by specifying
to_char(date_and_time + (.000694 * 31)
大部分时间都可以正常工作.但不是当时间在 AM/PM 边界时.例如，将 30 分钟添加到 12:30 [即 PM] 返回 1:00 即 AM.我期望的答案是 13:00.这样做的正确方法是什么?
which works fine most of the time. But not when the time is on the AM/PM border. For example, adding 30 minutes to 12:30 [which is PM] returns 1:00 which is AM. The answer I expect is 13:00. What's the correct way to do this?
所有其他答案基本上都正确，但我认为没有人直接回答您最初的问题.
All of the other answers are basically right but I don't think anyone's directly answered your original question.
假设您的示例中的date_and_time"是一个类型为 DATE 或 TIMESTAMP 的列，我认为您只需要对此进行更改:
Assuming that "date_and_time" in your example is a column with type DATE or TIMESTAMP, I think you just need to change this:
to_char(date_and_time + (.000694 * 31))
为此:
to_char(date_and_time + (.000694 * 31), 'DD-MON-YYYY HH24:MI')
听起来您的默认日期格式使用HH"代码表示小时，而不是HH24".
It sounds like your default date format uses the "HH" code for the hour, not "HH24".
此外，我认为您的常数项既令人困惑又不准确.我猜你所做的是计算出 (.000694) 大约是一分钟的值，然后将其乘以要添加的分钟数(示例中为 31，尽管您在文本中说的是 30).
Also, I think your constant term is both confusing and imprecise. I guess what you did is calculate that (.000694) is about the value of a minute, and you are multiplying it by the number of minutes you want to add (31 in the example, although you said 30 in the text).
我也会从一天开始，并将其划分为代码中所需的单位.在这种情况下，(1/48) 将是 30 分钟；或者，如果为了清楚起见，您想将其分解，可以写成 ( ((1/24) * (1/2) ).
I would also start with a day and divide it into the units you want within your code. In this case, (1/48) would be 30 minutes; or if you wanted to break it up for clarity, you could write ( (1/24) * (1/2) ).
这将避免舍入错误(浮点数固有的错误除外，这些错误在这里应该毫无意义)并且更清晰，至少对我而言.
This would avoid rounding errors (except for those inherent in floating point which should be meaningless here) and is clearer, at least to me.
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