[英]ORACLE 12c Unique constraint failing in MERGE command which is matching all columns from the index
我有一個匯總數據表,這些表收集不正確,並且我試圖將select的結果合並到其中,但遇到約束違規並且可能缺少明顯的東西。 表很簡單:
CREATE TABLE "DVRA_STATS_AGG_HOURLY"
( "ID" NUMBER(*,0),
"SHIPMENTS" NUMBER,
"EVENT_DATETIME" DATE,
"COUNTRY" VARCHAR2(2 CHAR),
"DATA_TYPE" VARCHAR2(3 CHAR),
"EVENT_TYPE" CHAR(15)
)
CREATE UNIQUE INDEX "DVRA_STATS_AGG_HOURLY_PK" ON "DVRA_STATS_AGG_HOURLY" ("ID")
CREATE UNIQUE INDEX "DVRA_STATS_AGG_HOURLY_UK1" ON "DVRA_STATS_AGG_HOURLY" ("EVENT_DATETIME", "COUNTRY", "DATA_TYPE", "EVENT_TYPE")
CREATE INDEX "DVRA_STATS_AGG_HOURLY_INDEX1" ON "DVRA_STATS_AGG_HOURLY" ("EVENT_DATETIME" DESC)
帶觸發順序和觸發
CREATE OR REPLACE EDITIONABLE TRIGGER "DVRA_STATS_AGG_HOURLY_AINC"
BEFORE INSERT ON dvra_stats_agg_hourly
FOR EACH ROW
BEGIN
SELECT stats_seq.NEXTVAL
INTO :new.id
FROM dual;
END;
合並也不復雜:
MERGE INTO dvra_stats_agg_hourly stats
USING(
SELECT COUNT(*) as SHIPMENTS, TRUNC(event_datetime,'HH24') as event_datetime,COUNTRY,data_type,event_type
FROM AUDIT
WHERE event_type in (<List of events>)
and TRUNC(event_datetime,'HH24') < trunc(sysdate,'HH24')
and audittable.event_datetime is not null
and audittable.COUNTRY is not null
and audittable.data_type is not null
and audittable.event_type is not null
GROUP BY TRUNC(event_datetime,'HH24'),COUNTRY,data_type,event_type
) audittable
ON (
audittable.event_datetime = stats.event_datetime
and audittable.COUNTRY = stats.COUNTRY
and audittable.data_type = stats.data_type
and audittable.event_type = stats.event_type
)
WHEN MATCHED THEN
UPDATE SET stats.SHIPMENTS = audittable.SHIPMENTS WHERE stats.SHIPMENTS <> audittable.SHIPMENTS
WHEN NOT MATCHED THEN
INSERT (SHIPMENTS,event_datetime,STATS.COUNTRY,data_type,event_type)
VALUES (audittable.SHIPMENTS,audittable.event_datetime,audittable.COUNTRY ,audittable.data_type ,audittable.event_type)
;
我收到錯誤消息:ORA-00001:唯一約束(DVRA_MONITORING.DVRA_STATS_AGG_HOURLY_UK1)被違反
我正在與在唯一約束中使用的相同列進行匹配。 我只插入不匹配的行,並且按相同的列分組,因此這些列的唯一組合應該只有一行。
執行此操作時,我只是一個更新表,因此在運行查詢期間沒有其他會話在處理數據。
我在這里想念什么?
編輯:將DVRA_STATS_AGG_HOURLY中的數據與insert插入select中。 與此合並中使用的選擇相同。 只是一些數據尚未正確加載,因此我正在更正。
Edit2:添加的不為null
Edit3:與Alex討論后合並查詢中的更改
MERGE INTO dvra_stats_agg_hourly stats
USING(
SELECT COUNT(*) as SHIPMENTS, TRUNC(event_datetime,'HH24') as event_datetime,COUNTRY,data_type,event_type
FROM BCTCUSTOM.V_DVRA_AUDIT
WHERE event_type in (<List of types>)
and TRUNC(event_datetime,'HH24') < trunc(sysdate,'HH24')
and TRUNC(event_datetime,'HH24') is not null
and event_datetime is not null
and COUNTRY is not null
and data_type is not null
and event_type is not null
GROUP BY TRUNC(event_datetime,'HH24'),COUNTRY,data_type,event_type
) audittable
ON (
audittable.event_datetime = stats.event_datetime
and ((audittable.COUNTRY is null and stats.COUNTRY is null) or audittable.COUNTRY = stats.COUNTRY)
and ((audittable.data_type is null and stats.data_type is null) or audittable.data_type = stats.data_type)
and ((audittable.event_type is null and stats.event_type is null) or audittable.event_type = stats.event_type)
)
WHEN MATCHED THEN
UPDATE SET stats.SHIPMENTS = audittable.SHIPMENTS WHERE stats.SHIPMENTS <> audittable.SHIPMENTS
WHEN NOT MATCHED THEN
INSERT (SHIPMENTS,event_datetime,STATS.COUNTRY,data_type,event_type)
VALUES (audittable.SHIPMENTS,audittable.event_datetime,audittable.COUNTRY ,audittable.data_type ,audittable.event_type)
;
如果您要在ON
子句中比較的四列中的任何一列為null,則它們將與當前條件不匹配,因為null = null
是未知的。
您可以添加顯式null檢查; 代替:
ON (
audittable.event_datetime = stats.event_datetime
and audittable.COUNTRY = stats.COUNTRY
and audittable.data_type = stats.data_type
and audittable.event_type = stats.event_type
)
做類似的事情:
ON (
audittable.event_datetime = stats.event_datetime
and ((audittable.COUNTRY is null and stats.COUNTRY is null)
or audittable.COUNTRY = stats.COUNTRY)
and ((audittable.data_type is null and stats.data_type is null)
or audittable.data_type = stats.data_type)
and ((audittable.event_type is null and stats.event_type is null)
or audittable.event_type = stats.event_type)
)
db <> fiddle不包含null-工作正常。
db <>帶有null的小提琴 -最初會失敗,但可以使用添加的顯式null檢查。
另一種可能是數據類型不匹配,因為您在顯示的表中使用的是CHAR(15)
。 如果審核表將該列定義為VARCHAR2(15)
則比較也會失敗(因為“只要比較中的一個或兩個值的數據類型為VARCHAR2或NVARCHAR2 , Oracle就會使用未填充的比較語義” )和隱式轉換在插入期間將導致約束沖突。 在這種情況下,您可以調整CHAR
值:
ON (
audittable.event_datetime = stats.event_datetime
and audittable.COUNTRY = stats.COUNTRY
and audittable.data_type = stats.data_type
and audittable.event_type = trim(stats.event_type)
)
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