drop foreign key
ALTER TABLE table_name DROP CONSTRAINT fk_name;
Source: www.techonthenet.com
foreign key constraint in ms sql
/*Creating Foreign Key Constraint*/ ALTER TABLE ForeignKeyTable ADD CONSTRAINT ForeignKeyTable_foreignKeyColumn_FK FOREIGN KEY (foreignKeyColumn) REFERENCES PrimaryKeyTable (PrimaryKeyColumn)
sql foreign key
create table Jobs( job_id number not null, job_title varchar(30), min_salary number, max_salary number ); create table job_history( employee_id number not null, start_date date, end_date date, job_id number not null, department_id number ); alter table jobs add constraint pk_jobs primary key(job_id); alter table job_history add constraint fk_job foreign key(job_id) references jobs(job_id);
foreign key in sql dbms
FOREIGN KEY (fk_col_name) REFERENCES target_table_name (pk_col_name);
Source: launchschool.com
SQL FOREIGN KEY Constraint
CREATE TABLE Orders ( order_id INT PRIMARY KEY, customer_id int REFERENCES Customers(id) );
foreign key sql
A foreign key is an attribute of a relation (subordinate/dependent) that points to the primary key of another relation (main/master) FK is used to create a many-to-one (one-to-many) relationship.