如何从 SQL 服务器中的同一列中查找多个最大值

Question

这是我的数据

id	day	op	hi	lo	cl	per_chng	gt
1	2007-01-01	1.95805	1.96417	1.95765	1.96332	-0.26842287553	0
2	2007-01-02	1.9633	1.97418	1.9604	1.97295	-0.48911528421	0
3	2007-01-03	1.97301	1.9749	194814	195169	1.0923865982814	1
4	2007-01-04	1.95165	1.95296	1.9398	1.94258	0.466904837896	1
5	2007-01-05	1.94251	1.94316	192633	1929	0.700362882322442	1
6	2007-01-07	1.93033	1.93057	1.92907	1.92932	0.05235005079	0
7	2007-01-08	1.92938	1.94023	1.92608	1.93087	-0.5407578858	0
8	2007-01-09	1.93985	1.94527	1.93852	1.9388	0.054157210645	0
9	2007-01-10	1.93881	1.94205	1.93148	1.93187	0.3592374228	0
10	2007-01-11	1.932	1.95336	1.93169	1.94305	-0.61472774505	0
11	2007-01-12	1.94392	1.96036	1.94268	1.95893	-0.766234628	0
12	2007-01-14	1.95938	1.96019	1.95791	1.95992	-0.027552144	0
13	2007-01-15	1.9598	1.96676	1.95697	1.96309	-0.2133412084	0
14	2007-01-16	1.96413	19702	1.959	1.96069	0.17544843906001	0
15	2007-01-17	1.96068	19722	1.96035	1.97015	-0.48067406035	0
16	2007-01-18	1.97022	1.97776	1.96364	1.97388	-0.185421606	0
17	2007-01-19	1.97382	1.97662	1.9696	1.97335	0.0238173664	0
18	2007-01-21	1.9738	1.97444	1.97288	1.97365	0.007600131735	0
19	2007-01-22	1.97367	197857	1.97169	1.97647	-0.1416667088	0
20	2007-01-23	1.97655	1.99145	1.97652	1.98179	-0.264407429	0
21	2007-01-24	1.98181	1.98299	1.96464	19677	0.717080855821	1
22	2007-01-25	1.96757	1.97307	1.96245	1.96495	0.1333367261	0
23	2007-01-26	1.96485	1.96771	1.95576	1.95005	0.2060618667	0
24	2007-01-28	1.95969	1.96137	1.95824	1.96096	-0.064764197	0
25	2007-01-29	1.96095	1.96123	1.95482	1.96108	-0.006629	0

我想找到 High 列的多个最大值。

例如，我想找到 High 列索引 1-14、2-15、3-16、4-17、5-18、6-19 的最大值。

如何使这个值也不同列？

Answer 1

您可以为此使用分析/窗口函数。

SELECT
  *,
  MAX(high) OVER (
    ORDER BY time
    ROWS BETWEEN CURRENT ROW AND 13 FOLLOWING
  )
    AS rolling_14_max_high
FROM
  your_data

这将取当前行及其后 13 行的最大值（按时间排序时）。

Answer 2

您可以为此使用 window 函数。 OFFSET 子句将跳过前 13 行

SELECT *,
  MaxHigh = MAX(High) OVER (ORDER BY Time ROWS BETWEEN 13 PRECEDING AND CURRENT ROW)
FROM YourTable t
OFFSET 13 ROWS FETCH 10000000 ROWS ONLY;

Answer 3

您可以在要搜索最大值的范围内使用起始索引：-

DECLARE @startIndex INT = 5 -- Starting Index
DECLARE @recods INT = 15 -- Number of next rows (Range)

SELECT MAX([Time]) FROM (SELECT [Time]
FROM YouTable
ORDER BY [Time]
OFFSET @startIndex ROWS FETCH NEXT @recods ROWS ONLY) T

如何从 SQL 服务器中的同一列中查找多个最大值

How to find multiple maximum value from same column in SQL Server

sql

sql-server

aggregate-functions

window-functions