SQL*PLUS help to query tables

Question

Is it possible to query tables of other users from a dba account?
My problem is that when i connect to sqlplus using:
sqlplus system/manager@mymachine
I can only see my tables... I cannot see the tables of other users of the same database... What is the correct syntax of doing it? (Is there a good newbie doc about sqlplus?)

Answer 1

Yes.
select owner, table_name from dba_tables;
(for example)
OWNER TABLE_NAME
XYZ123 MYTABLE
desc XYZ123.MYTABLE;
select * from xyz123.mytable;
If you get tired of prefixing the table name with the owner, you can do the following:
alter session set current_schema=xyz123;
select * from mytable;