If I login as "system" then it shows default table names(
select * from tab).
But when I login as "jagan", if I run a query (
select * from tab) it is not displaying...In order to display default tables from "jagan", what should I do?
SELECT * FROM TAB will only show objects that have been created in the schema you are connected to (i.e. JAGAN): until you create some objects there will be none to see.
TAB lists tables, clusters, views and synonyms from the current schema.
Oracle provides a number of other dictionary views that give more information:
USER_TABLES- all tables owned by the current user.
ALL_TABLES- all tables visible to the current user.
DBA_TABLES- all tables.
To view other objects as well as tables:
USER_OBJECTS- all owned by the current user.
ALL_OBJECTS- all visible to the current user.
DBA_OBJECTS- all objects.