如何根据年份和月份进行排名？

Question

我正在尝试根据年份和月份设置排名。我有像

这样的记录

产品

ProdID  Years  Months  Quantity
--------------------------------
1652    2018    10         2    
1010    2018    9          2    
2236    2018    10         2    
2236    2018    10         2    
1445    2019    5          2    
1789    2019    12         2    
1232    2018    12         2    

我尝试了以下查询

SELECT
    ProdID, Years, Months, Quantity,
    DENSE_RANK()OVER (Partition By Years Order By Months) Ranks
FROM Products

显然，结果将是

ProdID  Years  Months  Quantity   Ranks
---------------------------------------
1010    2018    9          2       1
1652    2018    10         2       2 
2236    2018    10         2       2
2236    2018    10         2       2
1232    2018    12         2       3
1445    2019    5          2       1
1789    2019    12         2       2

预计

ProdID  Years  Months  Quantity   Ranks
---------------------------------------
1010    2018    9          2       1
1652    2018    10         2       2 
2236    2018    10         2       2
2236    2018    10         2       2
1232    2018    12         2       3
1232    2018    12         2       3
1445    2019    5          2       4
1789    2019    12         2       5

Answer 1

您需要从查询中删除分区依据子句。只需使用 order by 子句即可。

SELECT ProdID, Years, Months, Quantity,
DENSE_RANK()OVER (Order By Years, Months) Ranks
FROM Products

Answer 2

以下查询应该可以满足您的要求：

SELECT
    ProdID, Years, Months, Quantity,
    DENSE_RANK()OVER (ORDER BY  CAST(CAST(MONTHS AS VARCHAR)+'-01-'+CAST(YEARS AS VARCHAR) AS DATE)) Ranks
FROM Products