Generate unique string in sql server 2012 -

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i have table 

create table #agency   (   agencyid int primary key identity(1,1),   agencyname varchar(100),    agencycode varchar(50)   )

i want generate unique agency code while inserting table...agency code should consists of alphabets ..no numbers or special characters

thank you

you can simple casting id varchar , replacing every digit letter (or combination).

1=a, 2=b, etc..

so, long ids unique, code be.

snippet like:

replace(replace(replace(replace(replace(replace(replace(replace(replace(replace(     cast(agencyid varchar(50))     ,'1','a'),'2','b'),'3','c'),'4','d'),'5','e'),'6','f'),'7','g'),'8','h'),'9','i'),'0','j')

if want during insert, can use ident_current('tablename') value inserts identity column.

      insert agency (agencyname, agencycode)     select 'name001',                replace(replace(replace(replace(replace(replace(replace(replace(replace(replace(               cast(ident_current('agency') varchar(50))               ,'1','a'),'2','b'),'3','c'),'4','d'),'5','e'),'6','f'),'7','g'),'8','h'),'9','i'),'0','j')  ;

sqlfiddle demo

creating function converts number string and/or computed column might prettier use.

demo using function , computed columns

edit:

demo updated request make @ least 5 string long character


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