CODEWITHSUNDEEP
mysqlsqlsql-serverdatabasebackend
DreamVision2017
DreamVision2017

Reputation: 372

Insert data into a table with a foreign key SQL

I need to insert some data into the 'ItemBook' table after inserting the following values for one row for the 'Item' Table:

Name='Clippers', itemLink='amazon.com' description='hair clippers'

Now I would also like to insert some data to the ItemBook table as well but I am not sure on how to do this with a table that has a foreign key. Here is the SQL code:

CREATE TABLE Item (
Name VARCHAR(100) NOT NULL,
itemLink VARCHAR(100) NOT NULL,
description VARCHAR(1000) NOT NULL,
PRIMARY KEY (Name)
);

CREATE TABLE ItemBook (
ItemName VARCHAR(100) NOT NULL,
Publisher VARCHAR(100) NOT NULL,
PRIMARY KEY (ItemName),
FOREIGN KEY (ItemName) REFERENCES Item(Name)
);

My attempt:

INSERT INTO itemBook (Name, Publisher)
VALUES ('Clippers', 'Bob');

Error Msg:

Error Code: 1175. You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column.  To disable safe mode, toggle the option in Preferences -> SQL Editor and reconnect.

Other Attempt:

INSERT INTO eventbook (EventName, Publisher)
SELECT E.name
FROM event E
WHERE E.name = eventbook.EventName;

Error Message:

Error Code: 1054. Unknown column 'eventbook.EventName' in 'where clause'

Upvotes: 1

Views: 8000

Answers (1)

Gustavo S. Jardim
Gustavo S. Jardim

Reputation: 26

Is there any specific reason to not use integer IDs? I would do the following:

CREATE TABLE Item (
Id INTEGER NOT NULL IDENTITY PRIMARY KEY,
Name VARCHAR(100) NOT NULL,
itemLink VARCHAR(100) NOT NULL,
description VARCHAR(1000) NOT NULL,
);

CREATE TABLE ItemBook (
Id INTEGER NOT NULL IDENTITY PRIMARY KEY,
ItemName VARCHAR(100) NOT NULL,
Publisher VARCHAR(100) NOT NULL,
ItemId INTEGER NOT NULL,
FOREIGN KEY (ItemId) REFERENCES Item(Id)
);

INSERT INTO ItemBook Values(1, 'ItemName', 'Publisher', 0)

What are your thoughts?

Edit 1. Based on your response and example, I have produced the following SQL for SQLITE (should work fine in other DBs as well)

CREATE TABLE Item (
Name VARCHAR(100) NOT NULL,
ItemLink VARCHAR(100) NOT NULL,
Description VARCHAR(1000) NOT NULL,
PRIMARY KEY (Name)
);

CREATE TABLE ItemBook (
ItemName VARCHAR(100) NOT NULL,
Publisher VARCHAR(100) NOT NULL,
PRIMARY KEY (ItemName),
FOREIGN KEY (ItemName) REFERENCES Item(Name)
);

INSERT INTO Item (Name, ItemLink, Description) VALUES("Test Book", "http://www.testlink.com/", "This is a test book");

INSERT INTO ItemBook (ItemName, Publisher) Values("Test Book", "Test Publisher");

SELECT * FROM Item i JOIN ItemBook b on b.ItemName = i.Name

Check the result in this print

Upvotes: 1

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