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mysql add foreign key

By SmokeFrogSmokeFrog on Apr 27, 2020
-- On Create
CREATE TABLE tableName (
    ID INT,
    SomeEntityID INT,
    FOREIGN KEY (SomeEntityID)
        REFERENCES SomeEntityTable(ID)

-- On Alter, if the column already exists but has no FK
 -- Add FK with a specific name
 -- On Alter, if the column already exists but has no FK

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sql foreign key

By KaotikKaotik on Feb 24, 2020
# A foreign key is essentially a reference to a primary
# key in another table.

# A Simple table of Users, 
  	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
	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

Source: www.riverfronttimes.com

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alter table add column and foreign key mysql

By Open OwlOpen Owl on Jun 27, 2020
ALTER TABLE database.table
  ADD COLUMN columnname INT DEFAULT(1),
  ADD FOREIGN KEY fk_name(fk_column) REFERENCES reftable(refcolumn) ON DELETE CASCADE;

Source: stackoverflow.com

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