foreign key constraint in ms sql
/*Creating Foreign Key Constraint*/
ALTER TABLE ForeignKeyTable ADD CONSTRAINT ForeignKeyTable_foreignKeyColumn_FK
FOREIGN KEY (foreignKeyColumn) REFERENCES PrimaryKeyTable (PrimaryKeyColumn)foreign key constraint in ms sql
/*Creating Foreign Key Constraint*/
ALTER TABLE ForeignKeyTable ADD CONSTRAINT ForeignKeyTable_foreignKeyColumn_FK
FOREIGN KEY (foreignKeyColumn) REFERENCES PrimaryKeyTable (PrimaryKeyColumn)how to set foreign key in sql server
CREATE TABLE Orders (
OrderID int NOT NULL,
OrderNumber int NOT NULL,
PersonID int,
PRIMARY KEY (OrderID),
FOREIGN KEY (PersonID) REFERENCES Persons(PersonID)
);Foreign Key in sql
CREATE TABLE Students ( /* Create table with foreign key - Way 1 */
ID INT NOT NULL
Name VARCHAR(255)
LibraryID INT
PRIMARY KEY (ID)
FOREIGN KEY (Library_ID) REFERENCES Library(LibraryID)
);
CREATE TABLE Students ( /* Create table with foreign key - Way 2 */
ID INT NOT NULL PRIMARY KEY
Name VARCHAR(255)
LibraryID INT FOREIGN KEY (Library_ID) REFERENCES Library(LibraryID)
);
ALTER TABLE Students /* Add a new foreign key */
ADD FOREIGN KEY (LibraryID)
REFERENCES Library (LibraryID);Copyright © 2021 Codeinu
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