Question

有没有人可以帮我创建'SORT'专栏。

这是两个例子，它应该如何运作。

请注意，第二个表中的最后两行是4和5，因为类型列更改为“k”，而数字是新的且日期相同。

示例1

DELIMITER $$

ALTER ALGORITHM=UNDEFINED DEFINER=`user_name`@`` SQL SECURITY DEFINER VIEW `VW_viewname` AS 
SELECT
  `DOM`.`CustomerID`    AS `CustomerID`,
  `DOM`.`User`          AS `User`,
  `DOM`.`DemoOrderDate` AS `DemoOrderDate`
FROM `Demo_Orders_M` `DOM`
WHERE (`DOM`.`DemoOrderStatus` = 253)
GROUP BY `DOM`.`CustomerID`
HAVING (COUNT(`DOM`.`CustomerID`) > 1)$$

DELIMITER ;

示例2

       date number  type    sort
        2012-03-23  3660    d   1
        2015-06-01  1890    k   2
        2015-06-02  8370    k   3
        2015-06-11  4345    d   4
        2015-06-11  4345    d   5
        2015-06-11  4345    d   6
        2015-06-11  4345    d   7
        2015-06-11  4345    d   8
        2015-06-11  4345    d   9
        2015-06-11  3534    k   10
        2015-06-11  3534    k   11

Answer 1

有点奇怪的要求，但这是解决方案：

select date, number, type, dense_rank() over(order by date, type asc, rank asc) rank2 from (
select row_number() over (partition by date, number, type order by date asc,type desc) rank, * from testTable
) a order by date, number desc, rank2 asc

而sql小提琴：

http://sqlfiddle.com/#!3/0ad7d/15

正确使用row_number的提示

1 个答案: