Question

我有一个包含数据集的表，我将其分区为每组Zscore。我计算了集合的平均值。我计算了集合的STDEV。我计算了集合的ZScore。

然后每套我想在SELECT分区中添加一行“My Label”，[Set columns]，[Calculated Partition Average + X * STDEV]

下面使用X = 1.5，表数据将包含分区的apple和orange数据

item    value avg   stdev
apple     1    2    0.81
apple     2    2    0.81
apple     3    2    0.81
my apple  3.2  null null
orange    2    4.6  2.49
orange    4    4.6  2.49
orange    8    4.6  2.49
my orange 8.4   null null

Answer 1

（我以为你的意思是STDEVP，而不是STDEV）你可以用这样的查询（包括样本数据创建 - 表@t）来做到这一点：

DECLARE @t TABLE(item VARCHAR(10), value FLOAT);
INSERT INTO @t(item, value)
VALUES('apple', 1),
    ('apple', 2),
    ('apple', 3),
    ('orange', 2),
    ('orange', 4),
    ('orange', 8);


DECLARE @factor FLOAT=1.5;


WITH
    tmp AS (
               SELECT item, value, AVG(value) OVER (PARTITION BY item) AS [Avg], STDEVP(value) OVER (PARTITION BY item) AS [StdevP]
               FROM @t
               UNION ALL
               SELECT item, AVG(value)+(STDEVP(value)* @factor) AS [Value], NULL AS [avg], NULL AS [StdevP]
               FROM @t
               GROUP BY item
           )
SELECT CASE WHEN [Avg] IS NULL THEN 'My ' ELSE '' END+item AS [Label], value, [Avg], [StdevP]
FROM tmp
ORDER BY item, CASE WHEN [Avg] IS NULL THEN 1 ELSE 0 END;

将计算行添加到选择中

1 个答案: