SQL for Oracle检查是否存在约束

Question

In SQL Server I can use the SQL below to check if a constraint exists and if it's a primary key, trigger, etc.

SELECT * 
    FROM dbo.sysobjects 
    WHERE id = OBJECT_ID(N'[SCHEMA].[TABLENAME]') 
        AND OBJECTPROPERTY(id, N'IsPrimaryKey') = 1

What would be the Oracle equivalent because my query uses SQL Server specific tables to find the answer.

Answer 1

SELECT * FROM USER_CONSTRAINTS WHERE CONSTRAINT_NAME = 'CONSTR_NAME';

THE CONSTRAINT_TYPE will tell you what type of contraint it is

• R - Referential key ( foreign key)
• U - Unique key
• P - Primary key
• C - Check constraint

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To find out if an object is a trigger, you can query USER_OBJECTS . OBJECT_TYPE will tell you if the object's a trigger, view, procedure et al.