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How do I list all tables in a schema in Oracle SQL?

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To check all tables in another schema, you should have one or more of the following system privileges:

SELECT ANY DICTIONARY

(SELECT | INSERT | UPDATE | DELETE) ANY TABLE

or the big-hammer, the DBA role.

With any of those privileges, you can select:

SELECT DISTINCT OWNER, OBJECT_NAME 

  FROM DBA_OBJECTS

 WHERE OBJECT_TYPE = 'TABLE'

   AND OWNER = '[some other schema]'

But, without those system privileges, you can just see the tables you have been granted some level of access to, whether directly or through a role like this:

SELECT DISTINCT OWNER, OBJECT_NAME 

  FROM ALL_OBJECTS

 WHERE OBJECT_TYPE = 'TABLE'

   AND OWNER = '[some other schema]'

Ultimately, you can always query the data dictionary for your own tables, as your rights to your tables cannot be revoked (as of 10g):

SELECT DISTINCT OBJECT_NAME 

  FROM USER_OBJECTS

 WHERE OBJECT_TYPE = 'TABLE'

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