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Oracle£ºselect top 100 * from tablename
Mssql£ºselect * from tablename where rownum < 101
8¡¢¶þ²æÊ÷
type
TBTreeNode = class
      Data: string;
      Left: TBTreeNode;
      Right: TBTreeNode;
end;
function NewNode(const Data: string; Left, Right: TBTreeNode): TBTreeNode;
begin
Result := TBTreeNode.Create;
Result.Data := Data;
Result.Left := Left;
Result.Right := Right;
end;
var Root: TBTreeNode;
procedure Init;
begin
{ ½¨Ê÷£º
               =
      X                 *
                  +             -
              1       2    3       4
}
Root = NewNode('=', NewNode('X', nil, nil),
NewNode('*', NewNode('+', NewNode('1', nil, nil), NewNode('2', nil, nil)),
NewNode('-', NewNode('3', nil, nil), NewNode('4', nil, nil))));
end;
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