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with t as ( select 'sa,123k' as str ), cte as ( select str, left(str, 1) as c, stuff(str, 1, 1, '') as rest, 1 as lev, convert(varchar(max), (case when left(str, 1) like '[a-zA-Z]' then left(str, 1) else '' end)) as chars from t union all select str, left(rest, 1) as c, stuff(rest, 1, 1, '') as rest, lev + 1, convert(varchar(max), (case when left(rest, 1) like '[a-zA-Z]' then chars + left(rest, 1) else chars end)) from cte where rest > '' and len(chars) < 3 ) select str, max(chars) from cte group by str
str
(No column name)
sa,123k
sak