How to find all tables with primary key SQL Server

Question: How can I find tables in a SQL Server database that have a Primary Key ? 

Answer: To identify if a table has a Primary Key - you can use the OBJECTPROPERTY method with the property TableHasPrimaryKey.   This returns 1 or 0 depending on whether the table has a PRIMARY KEY or not .

Example 1 : Check if a table has a PRIMRY KEY

SELECT OBJECTPROPERTY(OBJECT_ID(N'myschema.myTable'),'TableHasPrimaryKey')

Example 2: Find all tables with Unique NonClustered Indexes and the table has no Primary Key 

select schema_name(t.schema_id) as schemaname,t.name as tablename,i.name as indexname,i.is_unique
from sys.indexes i, sys.tables t
where i.object_id = t.object_id
  and i.type_desc = 'NONCLUSTERED' and i.is_unique = 1
  and OBJECTPROPERTY(OBJECT_ID(N''+schema_name(t.schema_id)+'.'+t.name+''),'TableHasPrimaryKey') = 0

Example 3 : Find all tables with Primary Keys 

SELECT
SCHEMA_NAME(schema_id) AS schemaname, name AS tablename
FROM sys.tables
WHERE
OBJECTPROPERTY(object_id,'TableHasPrimaryKey') = 1
GO

read more about SQL Server object management 

List Foreign Keys referencing tables in SQL Server

What are the triggers in SQL Server

How to find all identity columns in SQL Server

How to find default values of all SQL Server columns

How to find computed columns on a SQL Server table

Find SQL Server LOB Columns

How to List all indexes of all SQL tables

How to find SQL Filtered Indexes

Find LOB tables with no PRIMARY KEY

How to find UDT on SQL Server columns?