Oracle11g 优化Oracle SQL having NOT EXIST子句
我想调整下面的查询,消除其中指定的NOT EXIST子句。你能帮忙吗 GLT_temp_upload是一个临时表,其中as DA_DUEDATE是一个分区表,其中包含大量数据 请帮忙Oracle11g 优化Oracle SQL having NOT EXIST子句,oracle11g,database-performance,plsqldeveloper,sql-tuning,Oracle11g,Database Performance,Plsqldeveloper,Sql Tuning,我想调整下面的查询,消除其中指定的NOT EXIST子句。你能帮忙吗 GLT_temp_upload是一个临时表,其中as DA_DUEDATE是一个分区表,其中包含大量数据 请帮忙 SELECT DISTINCT batchid, store_area, STORE_AREA || ',' || STORE_ID ||
SELECT DISTINCT
batchid,
store_area,
STORE_AREA
|| ','
|| STORE_ID
|| ','
|| SMS_ID
|| ','
|| SMS_SERVICE
|| ','
|| SYNERGY_MODE_ID
|| ','
|| FREQUENCY
|| ','
|| DUEDATE
|| ','
|| STUDY_ID
|| ','
|| YEAR
|| ''
|| WEEK_ID
||',Not exist in Da_Duedate'
FROM GLT_temp_upload upload
WHERE upload.batchid = 1
AND NOT EXISTS
(SELECT due.week_id,
due.country_id,
due.year,
due.study_id,
due.store_id,
due.store_area,
due.synergy_mode_id,
upload.batchid,
due.due_date,
upload.sms_service
FROM DA_DUEDATE due
WHERE due.store_id = upload.store_id
AND due.study_id = upload.study_id
AND due.store_area = upload.store_area
AND due.frequency = upload.frequency
AND due.sms_service = upload.sms_service
AND due.week_id = upload.week_id
AND due.country_id = upload.country_id
AND due.year = upload.year
AND due.sms_id = upload.sms_id
AND due.synergy_mode_id =
upload.synergy_mode_id)
您可以尝试不存在/左加入/不在 在“不存在”中,选择1而不是列列表就足够了 有时,左连接可能更有益(取决于索引、表的大小等)
我建议您查看执行计划,为您的案例找到最佳解决方案。查看执行计划,原始代码是最佳的。我们还有其他选择吗?@Shriraj您也可以先尝试查找不同的值,然后再应用“不存在”。如果有很多怀疑者,你可能会赢得一些东西。
SELECT DISTINCT
batchid,
store_area,
STORE_AREA
|| ','
|| STORE_ID
|| ','
|| SMS_ID
|| ','
|| SMS_SERVICE
|| ','
|| SYNERGY_MODE_ID
|| ','
|| FREQUENCY
|| ','
|| DUEDATE
|| ','
|| STUDY_ID
|| ','
|| YEAR
|| ''
|| WEEK_ID
||',Not exist in Da_Duedate'
FROM GLT_temp_upload upload left join DA_DUEDATE due
ON due.store_id = upload.store_id
AND due.study_id = upload.study_id
AND due.store_area = upload.store_area
AND due.frequency = upload.frequency
AND due.sms_service = upload.sms_service
AND due.week_id = upload.week_id
AND due.country_id = upload.country_id
AND due.year = upload.year
AND due.sms_id = upload.sms_id
AND due.synergy_mode_id = upload.synergy_mode_id
WHERE upload.batchid = 1 and due.store_id is NULL;