Constraints and keys(quick help please)

I need to know what constraints and keys are on a table.please tell whst is the command.
Thnx in advance
Navneet

--constraints
select * from all_constraints where table_name = <your table>Constraint Types
P = Primary Key
R = Foreign Key
U = Unique Index
C = Check Constraint

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Constraints and keys(quick help please)

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