how to set foreign key in sql server

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showing results for - "how to set foreign key in sql server"
Parker
11 Jul 2020
1-- On Create
2CREATE TABLE tableName (
3    ID INT,
4    SomeEntityID INT,
5    PRIMARY KEY (ID),
6    FOREIGN KEY (SomeEntityID)
7        REFERENCES SomeEntityTable(ID)
8        ON DELETE CASCADE
9);
10
11-- On Alter, if the column already exists but has no FK
12ALTER TABLE
13  tableName
14ADD
15  FOREIGN KEY (SomeEntityID) REFERENCES SomeEntityTable(ID) ON DELETE CASCADE;
16  
17 -- Add FK with a specific name
18 -- On Alter, if the column already exists but has no FK
19ALTER TABLE
20  tableName
21ADD CONSTRAINT fk_name
22  FOREIGN KEY (SomeEntityID) REFERENCES SomeEntityTable(ID) ON DELETE CASCADE;
Ashton
21 Aug 2020
1CREATE TABLE Orders (
2    OrderID int NOT NULL,
3    OrderNumber int NOT NULL,
4    PersonID int,
5    PRIMARY KEY (OrderID),
6    FOREIGN KEY (PersonID) REFERENCES Persons(PersonID)
7);
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