Primary key in SQL , Foreign key in SQL

Опубликовано: 05 Октябрь 2024
на канале: Niner's IELTS

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The queries used in the tutorial are given below:

CREATE TABLE Employee(
EmpId INT PRIMARY KEY,
EmpName varchar(25),
EmpAddr varchar(50)
)

INSERT INTO Employee VALUES (1,'Alex','SCO 1 Link Road')
INSERT INTO Employee VALUES (2,'Carol','SCO 2 Link Road')
INSERT INTO Employee VALUES (3,'Ross','SCO 3 Link Road')
INSERT INTO Employee VALUES (3,'Ross','SCO 3 Link Road')
SELECT * FROM EMPLOYEE

CREATE TABLE DEPARTMENT
(
DepID INT Primary key,
Depname Varchar(50),
EmpID INT REFERENCES EMPLOYEE(EmpID))
INSERT INTO DEPARTMENT VALUES (201,'Mechanical',4)

SELECT * FROM DEPARTMENT