Select
a.xm,xk=substring(a.xk,b.number,charindex(',',a.xk+',',b.number)-b.number)
from
表A a join master..spt_values b
ON b.type='p' AND b.number BETWEEN 1 AND LEN(a.xk)
where
substring(','+a.xk,b.number,1)=','
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