SQL Server:如何做 3 个月的分区? [英] SQL Server: how to do 3 months' partition?
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问题描述
我想统计分区0-3个月的行数.月份由 MYMONTH 以 201601
的格式指定为 2016 年 1 月.我使用的是 SQL Server 2014.我如何做超过 3 个月的分区?
I want to count the number of rows in the partition 0-3months. Months are specified by MYMONTH in the format such that 201601
for 2016 January. I am using SQL Server 2014. How can I do the partition over 3 months?
SELECT COUNT(*),
COUNT(*)
/
(COUNT(*) OVER (PARTITION
BY MYMONTH RANGE BETWEEN 3 MONTH PRECEDING AND CURRENT MONTH))
FROM myData
示例
| Month | Value | ID |
-------------------------|
| 201601 | 1 | X |
| 201601 | 1 | Y |
| 201601 | 1 | Y |
| 201602 | 1 | Z |
| 201603 | 1 | A |
| 201604 | 1 | B |
| 201605 | 1 | C |
| 201607 | 1 | E |
| 201607 | 10 | EE |
| 201607 | 100 | EEE|
计数
| Month | Count | Count3M | Count/Count3M |
-------------------------------------------
| 201601| 3 | 3 | 3/3 |
| 201602| 1 | 4 | 1/4 |
| 201603| 1 | 5 | 1/5 |
| 201604| 1 | 6 | 1/6 |
| 201605| 1 | 4 | 1/4 |
| 201607| 3 | 5 | 3/5 |
推荐答案
你可以试试这个(MSSQL 2012):
You can try this (MSSQL 2012):
样本数据
CREATE TABLE mytable(
MONT INTEGER NOT NULL
,Value INTEGER NOT NULL
,ID VARCHAR(5) NOT NULL
);
INSERT INTO mytable(MONT,Value,ID) VALUES (201601,1,'X');
INSERT INTO mytable(MONT,Value,ID) VALUES (201601,1,'Y');
INSERT INTO mytable(MONT,Value,ID) VALUES (201601,1,'Y');
INSERT INTO mytable(MONT,Value,ID) VALUES (201602,1,'Z');
INSERT INTO mytable(MONT,Value,ID) VALUES (201603,1,'A');
INSERT INTO mytable(MONT,Value,ID) VALUES (201604,1,'B');
INSERT INTO mytable(MONT,Value,ID) VALUES (201605,1,'C');
INSERT INTO mytable(MONT,Value,ID) VALUES (201607,1,'E');
INSERT INTO mytable(MONT,Value,ID) VALUES (201607,10,'EE');
INSERT INTO mytable(MONT,Value,ID) VALUES (201607,100,'EEE');
查询 1
SELECT MONT, RC, RC+ LAG(RC,3,0) OVER ( ORDER BY MONT)+ LAG(RC,2,0) OVER ( ORDER BY MONT) + LAG(RC,1,0) OVER ( ORDER BY MONT) AS RC_3M_PREC -- + COALESCE( LEAD(RC) OVER ( ORDER BY MONT),0) AS RC_3M
FROM (SELECT MONT
, COUNT(*) RC
FROM mytable
GROUP BY MONT
) A
输出:
MONT RC RC_3M_PREC
----------- ----------- -----------
201601 3 3
201602 1 4
201603 1 5
201604 1 6
201605 1 4
201607 3 6
或者使用你提议的(选项 ROWS ... PRECEDING):
查询 2:
SELECT MONT, RC
, COALESCE(SUM(RC) OVER (ORDER BY MONT ROWS BETWEEN 3 PRECEDING AND CURRENT ROW),0) AS RC_3M
FROM (SELECT MONT
, COUNT(*) RC
FROM mytable
GROUP BY MONT
) A
输出:
MONT RC RC_3M
----------- ----------- -----------
201601 3 3
201602 1 4
201603 1 5
201604 1 6
201605 1 4
201607 3 6
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