Undoing the Effects of a Sort

Hi Allen,
Here in Australia, we are heading into Summer, so snow is far from our minds. We are however heading into bushfire season, so we hope it’s not like 2019-20.
When sorting, I have had a few disasters over the years working with big spreadsheets with university student data. So, I now save my spreadsheets with a date and time before doing a big sort and then continue to save regularly with file name updated. If there are no problems, I can then go back and deleted the progressive files.
Another trap I have fallen into is to find I have only sorted a portion of the data. This can occur due to inserting a new column into the data. If this column has no data entries then it splits the spreadsheet into two separate data ranges… and only works on one of them. To guard against this problem, I have learnt to put in an identifier as the columns at each edge of the spreadsheet. This can be a numeric reference number, but for students, I use their ID number. I then just have to remember to check that these two columns are in sync with each other, which is easy to do using the compare function.

In a "by the way" sort of way, one could point out that ANY time one might want to restore a particular order, even though the interim work may delete rows and change values that would not let the original sort parameters place all items in their original order, the helper column with index numbers in it before one sorts for the different purpose/s will, in the end, let you restore to original order for the records.

And if one was adding rows, one could leave that index value untouched as a true null to Excel until after resorting whereupon all the new rows would sort to the absolute bottom. They could then be assigned index numbers of their own, either starting with the next highest, or with the next highest relative to the original highest, if that row got deleted. (The latter would require you to have noted down that original highest number early on, for this purpose, or to be able to learn it any of various ways.)

All in all, the sequential numbering indexing is useful in many ways, though surely, the Tip's, and the above, would be the most commonly occurring.

Caveat: Do NOT rely upon any formula though. Type a 1 in the first cell and insert a sequence, or do a formula, but then Copy it and Paste|Special|Values to lose the formulas. Or you will be in the same boat as Nigel. Slightly different reason/path, but the same boat.

Hi Allen
Here in Cornwall UK the temperature is in the mid teens Celsius so snow is a long way off, I hope. On the sorting issue, I've been caught out by that when I 've used Excel professionally. My solution was to insert a column of sequential numbers at column A starting with 1 at the first line of data. Then if the sort goes wrong you can resort using only that column to get back to where you were originally. Alternatively make a copy of the the worksheet before you sort and delete it as necessary.
Cheers Alan Bowen