如何在Oracle中通过SQL获取表注释? [英] How to get table comments via SQL in Oracle?

问题描述

我尝试过:

select * from user_tab_comments;

它返回3列"TABLE_NAME"，"TABLE_TYPE"和"COMMENTS"，但是"TABLE_NAME"列就像"encrypted"一样，我需要清除表名:

and it returns me 3 columns "TABLE_NAME", "TABLE_TYPE", and "COMMENTS", but the "TABLE_NAME" column is like "encrypted", I need clear table names :

TABLE_NAME                      TABLE_TYPE  COMMENTS

BIN$IN1vjtqhTEKcWfn9PshHYg==$0  TABLE       Résultat d'intégration d'une photo numérisée
BIN$PUwG3lb3QoazOc4QaC1sjw==$0  TABLE       Motif de fin d'agrément de maître de stage

当我使用select * from user_tables;时，TABLE_NAME未被加密".

When I use select * from user_tables; TABLE_NAME is not "encrypted".

推荐答案

由于10g，当我们发出DROP TABLE语句时，Oracle不会立即删除表.而是像这样BIN$IN1vjtqhTEKcWfn9PshHYg==$0重命名它们并将它们放入回收站.这使我们能够恢复原本不想删除的表. 了解更多信息.

Since 10g Oracle doesn't immediately drop tables when we issue a DROP TABLE statement. Instead it renames them like this BIN$IN1vjtqhTEKcWfn9PshHYg==$0 and puts them in the recycle bin. This allows us to recover tables we didn't mean to drop. Find out more.

回收站中的表仍然是表，因此它们显示在ALL_TABLES和类似视图中.因此，如果您只想查看仅与活动(未删除)表相关的注释，则需要按表名称进行过滤:

Tables in the recycle bin are still tables, so they show up in ALL_TABLES and similar views. So if you only want to see comments relating only to live (non-dropped) tables you need to filter by table name:

select * from all_tab_comments
where substr(table_name,1,4) != 'BIN$'
/

---

我不敢相信没有标志列，所以您可以这样做，并且is_recycled = 0或其他."

"I can't believe there isn't a flag column so you could do and is_recycled = 0 or something. "

您是对的，这太不可思议了.因此我检查了文档，结果发现Oracle 10g在USER_/ALL_/DBA_TABLES视图中添加了一个名为DROPPED的列.

You're right, it would be incredible. So I checked the documentation it turns out Oracle 10g added a column called DROPPED to the USER_/ALL_/DBA_TABLES views.

select tc.* 
from all_tab_comments tc
     join all_tables t
     on tc.owner = t.owner
     and tc.table_name = t.table_name
where t.dropped = 'NO'
/

查看文档.显然，加入ALL_TABLES视图需要比对名称进行过滤更多的键入操作，因此根据我们的需要，保留原始WHERE子句可能会更容易.

Check out the documentation. Obviously the need to join to the ALL_TABLES view requires more typing than filtering on the name, so depending on our need it might just be easier to keep the original WHERE clause.

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