Perhaps I am looking at my entities as a hierarchy rather than a set of relationships; for sake of an example I have three tables:
Where Authors writes Books and Books contain content.
The rules for these entities is as follows:
- Content cannot stand alone without association to a Book
- a Book cannot stand alone without association to an Author
See below the following partial implementation:
CREATE TABLE authors( author_id integer, author_name varchar, author_age int, PRIMARY KEY (author_id) ); CREATE TABLE books( book_id integer, author_id integer, book_title varchar, book_published date, PRIMARY KEY (book_id, author_id), FOREIGN KEY (author_id) REFERENCES authors(author_id) );
From here I believe I have created a relationship where Books relies on Authors, should it decide to exist.
Arguably some may say that Content can simply just be part of Books, but say that Content has a hefty amount of columns in association to it and that a person would prefer to keep the more general Book data separate from its Content data for simplicity purposes.
In the event of the latter, how can I write a create statement that will make Content dependent on Books?
✓ Extra quality
ExtraProxies brings the best proxy quality for you with our private and reliable proxies
✓ Extra anonymity
Top level of anonymity and 100% safe proxies – this is what you get with every proxy package
✓ Extra speed
1,ooo mb/s proxy servers speed – we are way better than others – just enjoy our proxies!
USA proxy location
We offer premium quality USA private proxies – the most essential proxies you can ever want from USA
Our proxies have TOP level of anonymity + Elite quality, so you are always safe and secure with your proxies
Use your proxies as much as you want – we have no limits for data transfer and bandwidth, unlimited usage!
Superb fast proxy servers with 1,000 mb/s speed – sit back and enjoy your lightning fast private proxies!
99,9% servers uptime
Alive and working proxies all the time – we are taking care of our servers so you can use them without any problems
No usage restrictions
You have freedom to use your proxies with every software, browser or website you want without restrictions
Perfect for SEO
We are 100% friendly with all SEO tasks as well as internet marketing – feel the power with our proxies
Buy more proxies and get better price – we offer various proxy packages with great deals and discounts
We are working 24/7 to bring the best proxy experience for you – we are glad to help and assist you!