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 vote298 views1 answer
Mysql trigger to delete old data
SQL
1 vote286 views1 answer
Mysql how to truncate table with foreign keys
SQL
1 vote305 views1 answer
Drop primary key oracle
SQL
1 vote309 views1 answer
Oracle see column type
SQL
0 vote222 views1 answer
Import sql file in mysql linux
SQL
23 votes280 views1 answer
How remove column in mysql
SQL
3 votes278 views2 answers
Enter mysql command line
SQL
1 vote290 views1 answer
Mysql select for update ejemplo
SQL
2 votes256 views1 answer
Match in sql server
SQL
7 votes287 views3 answers
Convert ansi sql
SQL