What's the second non-repeating character?

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DECLARE @ varchar(99)=',,zzzbb@kkkkkkJgg'

,@i INT=99WHILE @i>1SELECT
@i-=1,@=IIF(LEN(@)>=LEN(x),x,@)FROM(SELECT
REPLACE(@,SUBSTRING(@,@i,1),'')x)x PRINT SUBSTRING(@,2,1)

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