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Asked: 2026-05-15T04:01:38+00:00

I have a table formatted similar to this: Date | ID | Value |

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I have a table formatted similar to this:

Date | ID | Value | Difference

I need to get the difference between a record’s value column, and the previous record’s value column based off of the date.

I.E

2 days ago | cow | 1 | Null

Yesterday | cow | 2 | Null

Today | cow | 3 | Null

Yesterdays difference would be 1, and today’s difference would be 1.

basically, I need to get the previous record based off the date, I don’t know the interval’s between each record. I’ve been stumped on this for a while. I am using Mysql, and Python to do the majority of the calculations.

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1 Answer

  1. Editorial Team

    Use a SELECT... WHERE date <= NOW() && date >= ( NOW() - 90000 ) (90,000 is 25 hours, giving you a little leeway with the insert time), and then take the difference between the rows in python.

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