This problem I found it many times, and I think to do a project that solves this in the most modular and clean ways possible (but I think the first thing is that it can be xD)
I want to perimero update the table "names", this table has the values:
id nombre letra
1 stan U
2 tony A
3 steve C
4 piter S
If my excel document is:
/ A B
1 stan M
2 tony I
3 steve N
4 piter V
When executing an action on any button or form with html and php, you can update the letter field in the table "names" to
id nombre letra
1 stan M
2 tony I
3 steve N
4 piter V
greetings