mysql - SQl Query for S.no -

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how use sql query generating s.no 1. can't answer correctly

select (@cnt := @cnt + 1) 's.no',`barcode`, (select @cnt := 0) dummy  wp_weblib_outitems

try this:

select  @s:=@s+1 's.no',`barcode`    wp_weblib_outitems,         (select @s:= 0) s;

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