Question

I have MYSQL data like this

id  | number
1   | 3
4   | 4
7   | 7
10  | 5
11  | 6

I have the database like that, and how to update the number so it will be sorted incremental?
Which mean the result will be like this

id  | number
1   | 1
4   | 2
7   | 3
10  | 4
11  | 5

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i updated the question so there will be no confusion in id and since id will be not consecutive

Answer 1

set @val = 0;
update  table_name set number = (@val:=@val+1);

This would work even if table is:

id  | number
1   | 3
4   | 4
7   | NULL
10  | 5
11  | NULL

to be like this:

id  | number
1   | 1
4   | 2
7   | 3
10  | 4
11  | 5