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 vote205 views1 answer
Like and not like together in sql
SQL
2 votes227 views1 answer
Sql string_agg
SQL
6 votes207 views1 answer
Sqlite foreign key
SQL
0 vote207 views1 answer
Version and edition of SQL Server Database Engine
SQL
40 votes213 views6 answers
Update table mysql
SQL
7 votes195 views1 answer
Mysql load data infile csv
SQL
3 votes229 views1 answer
Oracle list user grants
SQL
-1 vote213 views1 answer
Mysql coalesce
SQL
0 vote235 views1 answer
Time data type in mysql
SQL
0 vote346 views1 answer
Sql developer export connections
SQL