如何在SQL Server中创建两个非主键实体之间的关系

Question

I have few tables where I need to link Patient card ID (PID) of table patient where primary key is patient_id with the PID field of other tables... how can I do that? help!

Answer 1

You can use Foreign Keys

CREATE TABLE T
(
  any_primary_key INT PRIMARY KEY,
  [other attributes],
  patient_id,    
  FOREIGN KEY (patiend_id) REFERENCES Patients.patient_id
)

Where Patients is a table that has the original patient_id which has to be declared as unique .

Answer 2

you can join them like

SELECT * 
FROM [Patient] p
INNER JOIN [OtherTable] ot
  ON p.pid = ot.patient_id;