group by range in mysql

Question

Table:   
new_table                                                    
user_number  | diff                  
     2       |  0                      
     1       |          


        

Answer 1

If you have regular ranges, a quicker solution would be to group with the help of div function.

For instance:

select diff div 20 as range, sum(user_number)
from new_table
group by diff div 20;

Ranges are represented as single digits in that case and you have to know what they mean: 0 = 0-19, 1 = 20-39, 2 = 40-59,...

If you need different ranges use different divider or maybe subtract some number from diff. For instance "(diff - 1) div 10" gives you ranges 1-10, 11-20, 21-30,...

Answer 2

You might want to check Are square brackets valid in an SQL query?

I suspect that '[' and ']' are used in Microsoft's SQL but not mysql.