SQL PRIMARY KEY|PRIMARY KEY in SQL|Primary Key (PK) Constraint in SQL Server| DBMS| CTTUTORIAL
PRIMARY KEY in SQL|Primary Key (PK) Constraint in SQL Server
#CTTUTORIAL #DBMS #PRIMARY_KEY
In this Video you will learn about Primary Key Constraint in SQL.
Code:
CREATE TABLE Persons (
ID int NOT NULL,
LastName varchar(255) NOT NULL,
FirstName varchar(255),
Age int,
PRIMARY KEY (ID)
);
CREATE TABLE Persons (
ID int NOT NULL,
LastName varchar(255) NOT NULL,
FirstName varchar(255),
Age int,
CONSTRAINT PK_Person PRIMARY KEY (ID,LastName)
);
ALTER TABLE Persons
ADD PRIMARY KEY (ID);
ALTER TABLE Persons
ADD CONSTRAINT PK_Person PRIMARY KEY (ID,LastName);
ALTER TABLE Persons
DROP PRIMARY KEY;
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