SQL: GROUP BY for number ranges? -

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i'm first time poster , new sql, colleagues.
have column of numbers (let's call "numbers") , values in range 1-9999.
need create grouping column (let's call "numbers level") , assign values of aa numbers 1-999, bb 1000-6999 , cc 7000-9999.
so, final output below (output not need ordered):

numbers      |   numbers level -------------------------------------    136       |        aa   2935       |        bb   4288       |        bb   8987       |        cc   436        |        aa   3737       |        bb

is there easy way script this, i.e.: using group clause?
or grouping column have exist , need populate command?

please let me know if question wreaks of cluelessness , i'll clarify best can.

this easiest case statement (assuming you're using sql-server; if not, please add tags correct version).

select [numbers]   , case when [numbers] between 1 , 999 'aa'          when [numbers] between 1000 , 6999 'bb'          when [numbers] between 7000 , 9999 'cc'     end [numbers level] mytable

if of numbers don't fall ranges, return null - use else if want different result when happens.


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