Question

if I want to make a query that gets the count of users grouping ages

to get the counts each year as alone :

select count(*) 
from tbl_user 
group by age 

how can I make a custom group by so I can get ages in ranges for example …
like this example :

group by ages as 0-18 , 19-25 , 26-...

Answer 1

SUM 1 and CASE WHEN work in MS SQL Server, which version of SQL are you using?

SELECT
    SUM(CASE WHEN Age >= 0 AND Age <= 18 THEN 1 ELSE 0 END) AS [0-18],
    SUM(CASE WHEN Age >= 19 AND Age <= 25 THEN 1 ELSE 0 END) AS [19-25]
FROM
    YourTable