sql server - displaying parameter of the string in sql -

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i have string "dbo.proudction @prodid= '1,2,10,4,5,6,7,8,13,16,17,3' ,@stock= 0”.

i have execute query

to select '1,2,10,4,5,6,7,8,13,16,17,3'.

if understand correctly, want do:

select @prodid;

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