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foreign key in sql dbms

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mahmud answered on February 24, 2020 Popularity 10/10 Helpfulness 3/10

answer foreign key in sql dbms

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foreign key in sql dbms

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FOREIGN KEY (fk_col_name) 
REFERENCES target_table_name (pk_col_name);

Popularity 10/10 Helpfulness 3/10 Language sql

Source: launchschool.com

Tags: key sql

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Contributed on Aug 04 2021

mahmud

0 Answers Avg Quality 2/10

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sql foreign key

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# A foreign key is essentially a reference to a primary
# key in another table.

# A Simple table of Users, 
CREATE TABLE users(
	userId INT NOT NULL,
  	username VARCHAR(64) NOT NULL,
  	passwd VARCHAR(32) NOT NULL,
  	PRIMARY KEY(userId);
);
# Lets add a LEGIT user!
INSERT INTO users VALUES(1000,"Terry","Teabagface$2");

# We will create an order table that holds a reference
# to an order made by our Terry
CREATE TABLE orders(
	orderId INT NOT NULL,
  	orderDescription VARCHAR(255),
  	ordererId INT NOT NULL,
  	PRIMARY KEY(orderId),
  	FOREIGN KEY (ordererId) REFERENCES users(userId)
);
# Now we can add an order from Terry
INSERT INTO orders VALUES(0001,"Goat p0rn Weekly",1000);

# Want to know more about the plight of Goats?
# See the link below

Popularity 10/10 Helpfulness 4/10 Language sql

Source: www.riverfronttimes.com

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Contributed on Feb 24 2020

Kaotik

0 Answers Avg Quality 2/10

sql foreign key

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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);

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Source: Grepper

Tags: key

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Contributed on Sep 20 2021

Fierce Ferret

0 Answers Avg Quality 2/10

SQL foreign key

Comment

# A foreign key is essentially a reference to a primary
# key in another table.

# A Simple table of Users,
CREATE TABLE users(
    id INT NOT NULL AUTO_INCREMENT,
  	username VARCHAR(255) NOT NULL,
  	email VARCHAR(255) NOT NULL,
  	PRIMARY KEY(id)
);
# Lets add a LEGIT user!
INSERT INTO users VALUES(2,"Sharon","sharon@gmail.com");

# We will create an order table that holds a reference
# to an order made by our Terry
CREATE TABLE notes(
    id INT NOT NULL AUTO_INCREMENT,
  	body text,
  	user_id INT NOT NULL,
  	PRIMARY KEY(id),
  	FOREIGN KEY (user_id) REFERENCES users(id)
);
# Now we can add an order from Terry
INSERT INTO notes VALUES(4,"Update my php storm to version 22.3",2);

# Want to know more about the plight of Goats?
# See the link below

Popularity 10/10 Helpfulness 3/10 Language sql

Source: Grepper

Tags: key

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Contributed on Dec 07 2022

Alex Otieno

0 Answers Avg Quality 2/10

SQL FOREIGN KEY Constraint

Comment

CREATE TABLE Orders (
  order_id INT PRIMARY KEY,
  customer_id int REFERENCES Customers(id)
);

Popularity 10/10 Helpfulness 2/10 Language sql

Source: Grepper

Tags: key

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Contributed on May 22 2022

SAMER SAEID

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foreign key sql

Comment

 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.

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Source: Grepper

Tags: key

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Contributed on Mar 11 2022

coder

0 Answers Avg Quality 2/10

syntax to write foreign key in sql

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Popularity 10/10 Helpfulness 1/10 Language whatever

Source: Grepper

Tags: key

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Contributed on Jan 10 2023

Crowded Centipede

0 Answers Avg Quality 2/10

foreign key in sql dbms

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