SQL 游标提取

FETCH
   [
      [ NEXT | PRIOR | FIRST | LAST 
        | ABSOLUTE { n | @nvar }
        | RELATIVE { n | @nvar }
      ] 
      FROM
   ] 
   { 
      [ GLOBAL ] cursor_name
      | @cursor_variable_name
   } 
[ INTO @variable_name [ ,...n ] ]