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'
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