[英]SQL, convert integer for Timestamp subtraction
Assume we have a relation R(A, B), with A contains int values and B contains Timestamps. 假设我们有一个关系R(A,B),A包含int值,B包含Timestamps。
We have to calculate: (time in B in minutes) - (int to minutes)
. 我们必须计算:(
(time in B in minutes) - (int to minutes)
。
Example: (125, "2017-06-01 16:23:00")
示例:
(125, "2017-06-01 16:23:00")
16:23:00 = 983 min
125 = 125min
983 - 125 = 858min 983-125 = 858分钟
The elements of A represent minutes, my problem is to convert an integer value >59
to hh:mm
, since MAKETIME(hh, mm, ss)
only works in the range 0 to 59. A的元素代表分钟,我的问题是将整数值
>59
转换为hh:mm
,因为MAKETIME(hh, mm, ss)
仅适用于0到59的范围。
There's no need at all to convert the time of your timestamp column in minutes. 完全没有必要在几分钟内转换时间戳列的时间。
Just do 做就是了
SELECT B - INTERVAL A MINUTE;
If you really just want the time to be subtracted from do 如果你真的只是希望从中减去时间
SELECT TIME(B) - INTERVAL A MINUTE;
To let the date part be untouched: 让日期部分不受影响:
SELECT CONCAT(DATE(B), ' ', TIME(B) - INTERVAL A MINUTE);
When you absolutely need the minutes afterwards: 当你绝对需要以后的会议记录时:
SELECT HOUR(TIME(B) - INTERVAL A MINUTE) * 60 + MINUTE(TIME(B) - INTERVAL A MINUTE);
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