SQL - 如何计算百分比变化/增长

Question

我的数据库中有一个数据表,如下所示:

year    month   sales   mom       qoq   yoy
----------------
2010    1   80  -     - -
2010    2   61  -23.75%   - -
2010    3   81  32.79%    - -
2010    4   94  16.05%      -
2010    5   77  -18.09%     -
2010    6   75  -2.60%      -
2010    7   58  -22.67%     -
2010    8   74  27.59%      -
2010    9   98  32.43%      -
2010    10  97  -1.02%      -
2010    11  94  -3.09%      -
2010    12  63  -32.98%     -
2011    1   61  -3.17%      -23.75%
2011    2   79  29.51%      29.51%
2011    3   84  6.33%       3.70%
2011    4   100 19.05%      6.38%
2011    5   78  -22.00%     1.30%
2011    6   99  26.92%      32.00%
2011    7   78  -21.21%     34.48%
2011    8   63  -19.23%     -14.86%
2011    9   66  4.76%       -32.65%
2011    10  77  16.67%      -20.62%
2011    11  93  20.78%      -1.06%
2011    12  94  1.08%       49.21%

我想计算每个月(每行)的月度,季度和年度销售百分比变化,如上面最后3列所示.
如何在一个使用T-SQL的结果集中实现此目的？我正在使用SQL Server 2008 R2.谢谢.

Answer 1

此查询仅适用于MSSQL2012,但它的计划和执行时间要好得多

SELECT
    year,
    month,
    sales,
    (sales - LAG(sales, 1) over (ORDER BY year, month)) / LAG(sales, 1) over (ORDER BY year, month)*100 AS mom,
    (sales - LAG(sales, 4) over (ORDER BY year, month)) / LAG(sales, 4) over (ORDER BY year, month)*100 AS qoq,
    (sales - LAG(sales, 12) over (ORDER BY year, month)) / LAG(sales, 12) over (ORDER BY year, month)*100 AS yoy
FROM @tab