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我正在尝试执行以下存储过程，它需要永远执行它以获得更多记录。有什么办法可以用更好/优化的方式写这个

DECLARE productcursor CURSOR FOR
SELECT ProductId,
       product_startdate 
FROM   Products
WHERE  ProductStatus IN ('F', 'R', 'M')
GROUP BY productId

OPEN productcursor
FETCH NEXT FROM productcursor INTO @var_PId,@var_PStartDate
WHILE (@@FETCH_STATUS = 0)
BEGIN

SELECT @var_count = count(*) FROM   Products
    WHERE  ProductID IN ((
    SELECT ProductID FROM   Products
        WHERE  ProductStatus IN ('OR', 'OP')
        AND    Comments LIKE '%CANCELLED%'
        except (  SELECT ProductID FROM   Products WHERE  ProductStatus = 'DE'
                   UNION
                   SELECT ProductID FROM   Products WHERE  ProductStatus = 'OR' AND  Comments NOT LIKE '%CANCELLED%'
                   ))                
        except (    SELECT ProductID FROM   Products
        WHERE  ProductStatus IN ('RE', 'C', 'S', 'D')
                   ))
                   and productid = @var_PId

                   if @var_count = 0
                     INSERT INTO ProductDel
                      (ProductID, ProductDate, ProductDelStatus)
               VALUES (@var_PID, @var_PStartDate, 'UNKNOWN')
                   else
                     INSERT INTO ProductDel
                      (ProductID, ProductDate, ProductDelStatus)
               VALUES (@var_PID, @var_PStartDate, 'INService')
FETCH NEXT FROM productcursor INTO @var_PId,@var_PStartDate
END
Close productcursor
Deallocate productcursor

正如建议的那样，我可以在没有光标的情况下完成这项工作，但仍然需要永远执行这个......百万记录超过 2 小时 这是此 http://sqlfiddle.com/#!6/b14eb的 sql fiddle 链接/56

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