In this blog post, we’ll look at an example of Show Note: All data, names or naming found within the database presented in this post, are strictly used for practice, learning, instruction, and testing purposes. It by no means depicts actual data belonging to or being used by any party or organization. OS and DB used:
* Note: Both of the tables used in this blog post are a semblance of examples found in a fantastic PHP & MySQL book I am studying/learning from as I am exploring developing my skill-set in that back-end technology area. Therefore, all credit of design and
idea goes to that author and are not of my original planning or creation. I have slightly altered some of the table and column naming for my benefit and understanding. As of this writing, the book has not instructed or recommended the First, let’s get a description of each table.
And the
We can see there is a
Let’s see the
There is not an Let’s
That worked just fine.
Then let’s see that row we just added:
Now we are able to use that author’s
Let’s check the
All data is correct in the linking table. In a coming blog post, I’ll mitigate retyping the A Call To Action!Thank you for taking the time to read this post. I truly hope you discovered something interesting and enlightening. Please share your findings here, with someone else you know who would get the same value out of it as well. Visit the Portfolio-Projects page to see blog post/technical writing I have completed for clients. Have I mentioned how much I love a cup of coffee?!?! To receive email notifications (Never spam) from this blog (“Digital Owl’s Prose”) for the latest blog posts as they are published, please subscribe (of your own volition) by clicking the ‘Click To Subscribe!’ button in the sidebar on the homepage! (Feel free at any time to review the Digital Owl’s Prose Privacy Policy Page for any questions you may have about: email
updates, opt-in, opt-out, contact forms, etc…) Josh Otwell has a passion to study and grow as a SQL Developer and blogger. Other favorite activities find him with his nose buried in a good book, article, or the Linux command line. Among those, he shares a love of tabletop RPG games, reading fantasy novels, and spending time with his wife and two daughters. Disclaimer: The examples presented in this post are hypothetical ideas of how to achieve similar types of results. They are not the utmost best solution(s). The majority, if not all, of the examples provided are performed on a personal development/learning workstation-environment and should not be considered production quality or ready. Your particular goals and needs may vary. Use those practices that best benefit your needs and goals. Opinions are my own. How do you insert data into a table that has a foreign key?If you are inserting data into a dependent table with foreign keys: Each non-null value you insert into a foreign key column must be equal to some value in the corresponding parent key of the parent table. If any column in the foreign key is null, the entire foreign key is considered null.
How do I add a foreign key to an existing table in MySQL?Following are the syntax of the ALTER TABLE statement to add a foreign key in the existing table:. ALTER TABLE table_name.. ADD [CONSTRAINT [symbol]] FOREIGN KEY.. [index_name] (column_name, ...). REFERENCES table_name (column_name,...). ON DELETE referenceOption.. ON UPDATE referenceOption.. What is foreign key in MySQL?A FOREIGN KEY is a field (or collection of fields) in one table, that refers to the PRIMARY KEY in another table. The table with the foreign key is called the child table, and the table with the primary key is called the referenced or parent table.
How do you insert data into MySQL?To insert data into a MySQL table, you would need to use the SQL INSERT INTO command. You can insert data into the MySQL table by using the mysql> prompt or by using any script like PHP.
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