Foreign key

Laravel foreign key

Schema::table('posts', function (Blueprint $table) {
    $table->unsignedBigInteger('user_id');

    $table->foreign('user_id')->references('id')->on('users');
});
OR
Schema::table('posts', function (Blueprint $table) {
    $table->foreignId('user_id')->constrained();
});

Drop foreign key

ALTER TABLE table_name
DROP CONSTRAINT fk_name;

Source: techonthenet.com

Foreign key

USE Organization
CREATE TABLE Employee_Office
(
Id INT PRIMARY KEY IDENTITY(1,1),
Emp_Id int FOREIGN KEY REFERENCES Employee(Id),
Office_Id int FOREIGN KEY REFERENCES Office(Id)
)

Source: codingsight.com

Foreign key

CREATE TABLE Employee(
    EmployeeID int NOT NULL,
    LastName varchar(50) NOT NULL,
    FirstName varchar(20) NOT NULL,
    Age int,
    DeptNo int,
    PRIMARY KEY (EmployeeID),
    FOREIGN KEY (DeptNo) REFERENCES Department(DeptNo)
);

Source: computerscienceai.com

Foreign key

USE Organization
CREATE TABLE Employee
(
Id INT PRIMARY KEY IDENTITY(1,1),
Name VARCHAR (50) NOT NULL,
Age INT,
Gender VARCHAR (50),
Dep_Id int FOREIGN KEY REFERENCES Department(Id),
Insur_Id int FOREIGN KEY REFERENCES Insurance(Id)
)

Source: codingsight.com

Foreign key

ALTER TABLE your_table ADD FOREIGN KEY (your_column) REFERENCES other_table(other_column);

Source: stackoverflow.com

Similar codes

0 vote315 views1 answer
Mysql add text to existing field
SQL
0 vote286 views1 answer
Sql view index
SQL
4 votes294 views1 answer
Delete record mysql query
SQL
5 votes295 views1 answer
Oracle sysdate
SQL
3 votes318 views1 answer
Oracle APEX elapsed time
SQL
0 vote317 views1 answer
Https://livesql.oracle.com/apex/livesql/s/l8fedwph53gt5gigbacwvu6m0
SQL
2 votes351 views1 answer
Datefromparts mssql
SQL
1 vote287 views2 answers
Mysql spring boot application.properties
SQL
4 votes308 views2 answers
Oracle last day of month
SQL
0 vote316 views1 answer
Sqlites studio red exclamation mark when poening databse
SQL