Data Dictionary Queries for SQL Server and Oracle

For SQL Server

--Finding all details of Primary Key constraint
select * from sysobjectswhere xtype='PK'

--Finding all details of Foreign Key constraint
select * from sysobjectswhere xtype='F'

--Finding all User-Defined objects (tables, etc)
select * from sysobjectswhere xtype='U'

--Finding all System objects
select * from sysobjectswhere xtype='S'

--Finding all user names
select * from sysusers

--Finding Column Names of Particular Table
--Select Pubs Database
select c.name from sysobjects o, syscolumns cwhere o.id = c.id ando.name = 'publishers'



For ORACLE
select * from sys.dba_objectswhere owner = 'scott'and object_type='TABLE'
SELECT owner, object_name, object_type FROM sys.dba_objectswhere object_type='SEQUENCE' and owner='scott';

Today I was just trap with some queries and so the solution i come up with