Question

i have table and column varchar type column id
and values are m1, m2, … , m9,m10,m11,m12
then i use query

select MAX(id) from table

but the result as m9 because it consider m10 as ‘m’,’1′,’0′ as an individual characters.so m9>m1(0).

Please help ?how to query get max id from varchar type ?

Answer 1

select max(CAST((substring(id,2)) AS DECIMAL(5,2))) from table;

should do the trick.