Following script are very useful to know all the constraint in the database. I use this many times to check the foreign key and primary key constraint in database. This is simple but useful script from my personal archive.
USE AdventureWorks;
GO
SELECT OBJECT_NAME(OBJECT_ID) AS NameofConstraint,
SCHEMA_NAME(schema_id) AS SchemaName,
OBJECT_NAME(parent_object_id) AS TableName,
type_desc AS ConstraintType
FROM sys.objects
WHERE type_desc LIKE '%CONSTRAINT'
GO
Reference : Pinal Dave (https://blog.sqlauthority.com)
SQL SERVER – 2005 – List All The Constraint of Database – Find Primary Key and Foreign Key Constraint in Database
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