看起来像是从datax_logservice_logspace表中删除那些名字(name)存在重复,并且不存在关联到datax_logservice_access_config表中空间_id的记录,sql怎么写
时间: 2024-09-09 11:03:29 浏览: 18
你的描述基本符合原SQL语句的意图,只是更口语化了一些。以下是调整清晰度后的SQL语句:
```sql
DELETE FROM datax_logservice_logspace
WHERE name IN (
SELECT name
FROM (
SELECT name
FROM datax_logservice_logspace
GROUP BY name
HAVING COUNT(*) > 1 AND NOT EXISTS (
SELECT 1
FROM datax_logservice_access_config
WHERE space_id = datax_logservice_logspace.id
)
) AS duplicate_and_unmatched_names
);
```
这段SQL首先找出"datax_logservice_logspace"表中名字(name)重复(COUNT(*) > 1),且这些名字在"datax_logservice_access_config"表中没有匹配的空间_id的记录。
如果你需要生成相应的代码片段,假设你正在使用Python的SQLAlchemy,可以这样做:
```python
from sqlalchemy import delete, and_
# 假设session是Session对象,用于执行SQL操作
to_delete = session.query(DataxLogserviceLogspace).filter(
and_(
DataxLogserviceLogspace.name.in_(
session.query(DataxLogserviceLogspace.name).
group_by(DataxLogserviceLogspace.name).
having(count(DataxLogserviceLogspace.name) > 1),
),
~DataxLogserviceAccessConfig.exists().where(DataxLogserviceAccessConfig.space_id == DataxLogserviceLogspace.id)
)
)
# 执行删除操作,记得处理可能的异常
deleted_count = to_delete.delete(synchronize_session='fetch')
```