Question

情景1：

Table as,
IF OBJECT_ID('TEMPDB..#RUN_ID') IS NOT NULL
DROP TABLE #RUN_ID

;WITH RUN_ID as ( 

SELECT 1 AS RUN_ID,1 AS EMP_ID, '1/1/2018' STARTDT, 'A' AS VALUE
UNION
SELECT 2 AS RUN_ID,1 AS EMP_ID, '2/1/2018' STARTDT, 'A' AS VALUE
UNION
SELECT 3 AS RUN_ID,1 AS EMP_ID, '12/1/2017' STARTDT, 'A' AS VALUE
UNION
SELECT 4 AS RUN_ID,1 AS EMP_ID, '3/1/2018' STARTDT, 'A' AS VALUE
UNION
SELECT 5 AS RUN_ID,1 AS EMP_ID, '2/1/2018' STARTDT, 'A' AS VALUE
    )

SELECT * INTO #RUN_ID from RUN_ID

RUN_ID  EMP_ID  STARTDT VALUE
1   1   1/1/2018    A
2   1   2/1/2018    A
3   1   12/1/2017   A
4   1   3/1/2018    A
5   1   2/1/2018    A

RUN_ID是表中每天的增量值。 VALUE列可以相同也可以不同。需要得出STARTDT的结果如下：

RUN_ID  EMP_ID  STARTDT VALUE
3   1   12/1/2017   A
5   1   2/1/2018    A

注意：RUN ID 5的最后记录是写入所有其他记录，其中2/1/2018的StartDt记录在目标中，RUN ID 3应该在结果中，因为它覆盖了以前的RUN ID StartDT

Scenario2：

RUN_ID  EMP_ID  STARTDT VALUE
1   1   1/1/2018    A
2   1   11/1/2017   A
3   1   12/1/2017   A
4   1   3/1/2018    A
5   1   2/1/2018    A

在这种情况下，结果应为

RUN_ID  EMP_ID  STARTDT VALUE
2   1   11/1/2017   A
3   1   12/1/2017   A
5   1   2/1/2018    A

Answer 1

如果OBJECT_ID（'TEMPDB ..＃RUN_ID'）不是NULL DROP TABLE #RUN_ID

;将RUN_ID作为（

SELECT 1 AS RUN_ID，1 AS EMP_ID，CAST（'1/1/2018'AS DATE）STARTDT，'A'AS VALUE 联盟 SELECT 2 AS RUN_ID，1 AS EMP_ID，CAST（'11 / 1/2017'日期）STARTDT，'A'AS VALUE 联盟 SELECT 3 AS RUN_ID，1 AS EMP_ID，CAST（'12 / 1 / 2017'AS DATE）STARTDT，'A'AS VALUE 联盟 SELECT 4 AS RUN_ID，1 AS EMP_ID，CAST（'3/1/2018'AS DATE）STARTDT，'A'AS VALUE 联盟 SELECT 5 AS RUN_ID，1 AS EMP_ID，CAST（'2/1/2018'AS DATE）STARTDT，'A'AS VALUE ）

从RUN_ID中选择* INTO #RUN_ID

SELECT * FROM（选择 * ，LAG（STARTDT）OVER（按RUN_ID DESC的EMP_ID顺序分区）LAG_DATE ，LAG（STARTDT）结束时的情况（由RUN_ID DESC按EMP_ID顺序分区）为0然后为0 什么时候开始＆lt; LAG（STARTDT）OVER（由RUN_ID DESC按EMP_ID顺序分区）然后0结束1结束SCD_IND FROM（选择 * ，RANK（）超过（按EMP_ID划分，按RUN_ID DESC开始订购）RN 来自#RUN_ID ）一个 A.RN = 1 ）A SERE_IND = 0

RUN_ID EMP_ID STARTDT VALUE RN LAG_DATE SCD_IND 5 1 2018-02-01 A 1 NULL 0 3 1 2017-12-01 A 1 2018-03-01 0 2 1 2017-11-01 A 1 2017-12-01 0

选择具有回溯和未来日期方案的正确有效日期

1 个答案: