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select pk, Column_1 into t from (values (1, 'addcd'), (2, 'swrrh'), (3, 'dggdd'), (4, 'wdffa')) v(pk, column_1)
4 rows affected
with tt as ( select t.*, row_number() over (order by pk) as seqnum from t ), bigstring as ( select convert(varchar(max), column_1) as bigstring, seqnum from tt union all select concat(bigstring.bigstring, tt.column_1), tt.seqnum from bigstring join tt on tt.seqnum = bigstring.seqnum + 1 ), string4 as ( select top (1) left(bigstring, 4) as string4, stuff(bigstring, 1, 4, '') as rest4, 1 as lev from bigstring order by len(bigstring.bigstring) desc union all select left(rest4, 4), stuff(rest4, 1, 4, ''), lev + 1 from string4 where rest4 > '' ) select string4.string4 from string4 order by lev
string4
addc
dswr
rhdg
gddw
dffa