我想获得帮助以获得Oracle 11gR2的特定结果。
首先，我需要从Table＆＃34; RAW_DATA＆＃34;开始。像这样安排：
CREATE TABLE RAW_DATA
AS
SELECT 'MTL' AS EMH_CED,'ATW 25-55' AS EMH_ID,to_date('2014-12-03 17:17:10','yyyy-mm-dd hh24:mi:ss') AS EMH_DATE_HEURE,'AM' AS EMH_TYPE_MESURE,'A' AS EMH_PHASE,75 AS EMH_MESURE FROM dual union ALL
SELECT 'MTL','ATW 25-55',to_date('2014-12-03 17:17:10','yyyy-mm-dd hh24:mi:ss'),'AM','B',100 FROM dual union ALL
SELECT 'MTL','ATW 25-55',to_date('2014-12-03 17:17:10','yyyy-mm-dd hh24:mi:ss'),'AM','C',98 FROM dual union ALL
SELECT 'MTL','ATW 25-55',to_date('2014-12-03 17:17:29','yyyy-mm-dd hh24:mi:ss'),'AM','A',75 FROM dual union ALL
SELECT 'MTL','ATW 25-55',to_date('2014-12-03 17:17:29','yyyy-mm-dd hh24:mi:ss'),'AM','B',100 FROM dual union ALL
SELECT 'MTL','ATW 25-55',to_date('2014-12-03 17:17:29','yyyy-mm-dd hh24:mi:ss'),'AM','C',98 FROM dual union ALL
SELECT 'MTL','ATW 25-55',to_date('2014-12-03 17:17:57','yyyy-mm-dd hh24:mi:ss'),'AM','A',84 FROM dual union ALL
SELECT 'MTL','ATW 25-55',to_date('2014-12-03 17:17:57','yyyy-mm-dd hh24:mi:ss'),'AM','B',100 FROM dual union ALL
SELECT 'MTL','ATW 25-55',to_date('2014-12-03 17:17:57','yyyy-mm-dd hh24:mi:ss'),'AM','C',98 FROM dual union ALL
SELECT 'MTL','ATW 25-55',to_date('2014-12-04 00:00:00','yyyy-mm-dd hh24:mi:ss'),'AM','B',91 FROM dual union ALL
SELECT 'MTL','ATW 25-55',to_date('2014-12-04 00:00:00','yyyy-mm-dd hh24:mi:ss'),'AM','C',89 FROM dual union ALL
SELECT 'MTL','ATW 25-55',to_date('2014-12-04 15:06:07','yyyy-mm-dd hh24:mi:ss'),'AM','A',0 FROM dual union ALL
SELECT 'MTL','ATW 25-55',to_date('2014-12-04 15:06:07','yyyy-mm-dd hh24:mi:ss'),'AM','B',0 FROM dual union ALL
SELECT 'MTL','ATW 25-55',to_date('2014-12-04 15:06:07','yyyy-mm-dd hh24:mi:ss'),'AM','C',0 FROM dual union ALL
SELECT 'MTL','ATW 25-55',to_date('2014-12-04 16:22:37','yyyy-mm-dd hh24:mi:ss'),'AM','A',23 FROM dual union ALL
SELECT 'MTL','ATW 25-55',to_date('2014-12-04 16:22:37','yyyy-mm-dd hh24:mi:ss'),'AM','B',24 FROM dual union ALL
SELECT 'MTL','ATW 25-55',to_date('2014-12-04 16:22:37','yyyy-mm-dd hh24:mi:ss'),'AM','C',24 FROM dual union ALL
SELECT 'MTL','ATW 25-55',to_date('2014-12-04 16:27:36','yyyy-mm-dd hh24:mi:ss'),'AM','A',34 FROM dual union ALL
SELECT 'MTL','ATW 25-55',to_date('2014-12-04 16:27:43','yyyy-mm-dd hh24:mi:ss'),'AM','B',40 FROM dual union ALL
SELECT 'MTL','ATW 25-55',to_date('2014-12-04 16:27:43','yyyy-mm-dd hh24:mi:ss'),'AM','C',39 FROM dual union ALL
SELECT 'MTL','ATW 25-55',to_date('2014-12-04 16:28:12','yyyy-mm-dd hh24:mi:ss'),'AM','A',51 FROM dual union ALL
SELECT 'MTL','ATW 25-55',to_date('2014-12-04 16:28:12','yyyy-mm-dd hh24:mi:ss'),'AM','B',58 FROM dual union ALL
SELECT 'MTL','ATW 25-55',to_date('2014-12-04 16:28:12','yyyy-mm-dd hh24:mi:ss'),'AM','C',57 FROM dual union ALL
SELECT 'MTL','ATW 25-55',to_date('2014-12-04 16:40:33','yyyy-mm-dd hh24:mi:ss'),'AM','B',80 FROM dual union ALL
SELECT 'MTL','ATW 25-55',to_date('2014-12-04 16:40:33','yyyy-mm-dd hh24:mi:ss'),'AM','C',78 FROM dual union ALL
SELECT 'MTL','ATW 25-55',to_date('2014-12-04 16:41:02','yyyy-mm-dd hh24:mi:ss'),'AM','A',73 FROM dual union ALL
SELECT 'MTL','ATW 25-55',to_date('2014-12-04 16:47:10','yyyy-mm-dd hh24:mi:ss'),'AM','A',83 FROM dual union ALL
SELECT 'MTL','ATW 25-55',to_date('2014-12-04 16:55:39','yyyy-mm-dd hh24:mi:ss'),'AM','B',98 FROM dual union ALL
SELECT 'MTL','ATW 25-55',to_date('2014-12-04 16:27:59','yyyy-mm-dd hh24:mi:ss'),'AM','A',0 FROM dual union ALL
SELECT 'MTL','ATW 25-55',to_date('2014-12-04 16:27:59','yyyy-mm-dd hh24:mi:ss'),'AM','B',0 FROM dual union ALL
SELECT 'MTL','ATW 25-55',to_date('2014-12-04 16:27:59','yyyy-mm-dd hh24:mi:ss'),'AM','C',0 FROM dual union ALL
SELECT 'MTL','ATW 25-55',to_date('2014-12-04 16:56:37','yyyy-mm-dd hh24:mi:ss'),'AM','C',96 FROM dual;
我正在寻找的最终结果如下：
我需要在一个数据阵列上拥有＆＃34; EMH_MESURE＆＃34;对于＆＃34; EMH_PHASE＆＃34;的每个值; （＆＃34; A＆＃34;，＆＃34; B＆＃34;和＆＃34; C＆＃34;）。该结果需要存储在三个新列中，分别命名为＆＃34; MESURE_A＆＃34;，＆＃34; MESURE_B＆＃34;和＆＃34; MESURE_C＆＃34;。
之后，我需要在零交叉之前和之后的数据流（这是MESURE_A=MESURE_B=MESURE_C=0时，＆＃34; RAW_DATA＆＃34;按＆＃34; EMH_DATE_HEURE＆＃34;）排序。我还需要与零交叉相对应的数据行。在我的背景下，可能有几个过零点。然后，基于表＆＃34; RAW_DATA＆＃34;，我想得到的结果如下：
EMH_CED, EMH_ID, EMH_DATE_HEURE, EMH_TYPE_MESURE, MESURE_A, MESURE_B, MESURE_C
MTL ATW 25-55 2014-12-04 00:00:00 AM 84 91 89
MTL ATW 25-55 2014-12-04 15:06:07 AM 0 0 0
MTL ATW 25-55 2014-12-04 16:22:37 AM 23 24 24
MTL ATW 25-55 2014-12-04 16:27:43 AM 34 40 39
MTL ATW 25-55 2014-12-04 16:27:59 AM 0 0 0
MTL ATW 25-55 2014-12-04 16:28:12 AM 51 58 57
所以，我首先改变了专栏＆＃34; EMH_PHASE＆＃34;来自＆＃34; RAW_DATA＆＃34;使用下面的代码进入3个区别列（＆＃34; MESURE_A＆＃34;，＆＃34; MESURE_B＆＃34;和＆＃34; MESURE_C＆＃34;）。
WITH ROWS_TO_COLUMNS AS(
SELECT EMH_CED
,EMH_ID
,EMH_DATE_HEURE
,EMH_TYPE_MESURE
, MAX(decode(EMH_PHASE,'A', EMH_MESURE, null)) AS MESURE_A
, MAX(decode(EMH_PHASE,'B', EMH_MESURE, null)) AS MESURE_B
, MAX(decode(EMH_PHASE,'C', EMH_MESURE, null)) AS MESURE_C
FROM RAW_DATA
GROUP BY EMH_CED, EMH_ID, EMH_DATE_HEURE, EMH_TYPE_MESURE
)
到目前为止，它似乎做了我想要的，但我得到了一些无关的空值。
然后，我使用以下代码填充每个值之前的值：
NULLS_FILLED AS(
SELECT EMH_CED, EMH_ID, EMH_DATE_HEURE
,FIRST_VALUE(MESURE_A) IGNORE NULLS
OVER (PARTITION BY EMH_CED, EMH_ID ORDER BY EMH_CED, EMH_ID, EMH_DATE_HEURE DESC
RANGE BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING) AS MESURE_A
,FIRST_VALUE(MESURE_B) IGNORE NULLS
OVER (PARTITION BY EMH_CED, EMH_ID ORDER BY EMH_CED, EMH_ID, EMH_DATE_HEURE DESC
RANGE BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING) AS MESURE_B
,FIRST_VALUE(MESURE_C) IGNORE NULLS
OVER (PARTITION BY EMH_CED, EMH_ID ORDER BY EMH_CED, EMH_ID, EMH_DATE_HEURE DESC
RANGE BETWEEN CURRENT ROW AND UNBOUNDED FOLLOWING) AS MESURE_C
FROM ROWS_TO_COLUMNS
ORDER BY EMH_DATE_HEURE
)
该操作后的结果是我在开始时寻找的结果。
下一步是我需要帮助的地方。我想在MESURE_A=MESURE_B=MESURE_C=0时只获取LEADing和LAGing行（我也需要显示此行）。
现在，我只能获得LAGing行，以及表格的最后一行，我甚至不想要。我仍然需要找到一种方法来摆脱我失去的2行，而不是我想要的那一行。
到目前为止，我尝试了不同的事情而没有任何好的结果。帮助
以下是我的其余代码，需要进行调整以获得所需的结果：
,RN_DATA AS(
SELECT NULLS_FILLED.*, row_number() over (order by EMH_CED, EMH_ID, EMH_DATE_HEURE) AS rn
FROM NULLS_FILLED
)
,DATA_GROUPED AS (
SELECT RN_DATA.*, rownum - rn AS grp
FROM RN_DATA
WHERE MESURE_A>0 AND MESURE_B>0 AND MESURE_C>0
)
SELECT max(EMH_CED) keep (dense_rank first ORDER BY EMH_CED, EMH_ID, EMH_DATE_HEURE DESC) AS EMH_CED
,max(EMH_ID) keep (dense_rank first ORDER BY EMH_CED, EMH_ID, EMH_DATE_HEURE DESC) AS EMH_ID
,max(EMH_DATE_HEURE) keep (dense_rank first ORDER BY EMH_CED, EMH_ID, EMH_DATE_HEURE DESC) AS EMH_DATE_HEURE
,max(MESURE_A) keep (dense_rank first ORDER BY EMH_CED, EMH_ID, EMH_DATE_HEURE DESC) AS MESURE_A
,max(MESURE_B) keep (dense_rank first ORDER BY EMH_CED, EMH_ID, EMH_DATE_HEURE DESC) AS MESURE_B
,max(MESURE_C) keep (dense_rank first ORDER BY EMH_CED, EMH_ID, EMH_DATE_HEURE DESC) AS MESURE_C
,max(rn) keep (dense_rank first ORDER BY EMH_CED, EMH_ID, EMH_DATE_HEURE DESC) AS rn
FROM DATA_GROUPED
GROUP BY grp
ORDER BY rn
;
随意使用SQL Fiddle测试我的代码： http://sqlfiddle.com/#!4/e6b2e0/4/0
答案 0 :(得分：1)
我不明白你为什么使用ROW_NUMBER，FIRST，LAST函数。您只需使用LEAD, LAG函数。
WITH rows_to_columns AS
(
SELECT emh_ced,
emh_id,
emh_date_heure,
emh_type_mesure,
Max (
CASE emh_phase
WHEN 'A' THEN emh_mesure
END) AS mesure_a,
Max (
CASE emh_phase
WHEN 'B' THEN emh_mesure
END) AS mesure_b,
Max (
CASE emh_phase
WHEN 'C' THEN emh_mesure
END) AS mesure_c
FROM raw_data
GROUP BY emh_ced,
emh_id,
emh_date_heure,
emh_type_mesure), nulls_filled AS
(
SELECT emh_ced,
emh_id,
emh_date_heure,
emh_type_mesure,
First_value ( mesure_a) ignore nulls over (PARTITION BY emh_ced, emh_id ORDER BY emh_ced, emh_id, emh_date_heure DESC RANGE BETWEEN CURRENT ROW AND unbounded following) AS mesure_a,
first_value ( mesure_b) ignore nulls over (PARTITION BY emh_ced, emh_id ORDER BY emh_ced, emh_id, emh_date_heure DESC RANGE BETWEEN CURRENT ROW AND unbounded following) AS mesure_b,
first_value ( mesure_c) ignore nulls over (PARTITION BY emh_ced, emh_id ORDER BY emh_ced, emh_id, emh_date_heure DESC RANGE BETWEEN CURRENT ROW AND unbounded following) AS mesure_c,
lead ( mesure_a, 1) over (PARTITION BY emh_ced, emh_id ORDER BY emh_ced, emh_id, emh_date_heure) lead_a,
lead ( mesure_b, 1) over (PARTITION BY emh_ced, emh_id ORDER BY emh_ced, emh_id, emh_date_heure) lead_b,
lead ( mesure_c, 1) over (PARTITION BY emh_ced, emh_id ORDER BY emh_ced, emh_id, emh_date_heure) lead_c,
lag ( mesure_a, 1) over (PARTITION BY emh_ced, emh_id ORDER BY emh_ced, emh_id, emh_date_heure) lag_a,
lag ( mesure_b, 1) over (PARTITION BY emh_ced, emh_id ORDER BY emh_ced, emh_id, emh_date_heure) lag_b,
lag ( mesure_c, 1) over (PARTITION BY emh_ced, emh_id ORDER BY emh_ced, emh_id, emh_date_heure) lag_c
FROM rows_to_columns)
SELECT emh_ced,
emh_id,
emh_date_heure,
emh_type_mesure,
mesure_a,
mesure_b,
mesure_c
FROM nulls_filled
WHERE (
mesure_a = 0
AND mesure_b = 0
AND mesure_c = 0)
OR (
lead_a = 0
AND lead_b = 0
AND lead_c = 0)
OR (
lag_a = 0
AND lag_b = 0
AND lag_c = 0)
ORDER BY 3;
| EMH_CED | EMH_ID | EMH_DATE_HEURE | EMH_TYPE_MESURE | MESURE_A | MESURE_B | MESURE_C |
|---------|-----------|---------------------------------|-----------------|----------|----------|----------|
| MTL | ATW 25-55 | December, 04 2014 00:00:00+0000 | AM | 84 | 91 | 89 |
| MTL | ATW 25-55 | December, 04 2014 15:06:07+0000 | AM | 0 | 0 | 0 |
| MTL | ATW 25-55 | December, 04 2014 16:22:37+0000 | AM | 23 | 24 | 24 |
| MTL | ATW 25-55 | December, 04 2014 16:27:43+0000 | AM | 34 | 40 | 39 |
| MTL | ATW 25-55 | December, 04 2014 16:27:59+0000 | AM | 0 | 0 | 0 |
| MTL | ATW 25-55 | December, 04 2014 16:28:12+0000 | AM | 51 | 58 | 57 |