Oracle for dummies ebook download

Let me explain. When eventually, you rise to leave, you exchange names and numbers and promise to stay in touch. They say their name is Ross Geller. You add it to your address book. But you already had a friend named Ross Geller!

How will you know which is which when you want to phone them up and laugh about the monkey joke again? Names — even rare ones like Ross Geller — do not uniquely identify a record, so we need something that does. Databases rule the world, and thus, primary keys are all around us. We now have all the pieces of the puzzle. We can now redefine — and understand — relational databases. A Relational Database is a database in which the data is organised in tables with the relationships being maintained between the different tables.

Our database has a table for names, another for phone numbers, and a third for addresses. However, there is no way of knowing which of our friends lives at what address and when, or what their phone number might be.

Take a minute to study the tables. Notice how useful primary keys are? And so, armed with our burgeoning knowledge of databases, we can look at the following:. And the reason we know that is because we now implicitly understand the concept of foreign keys. Foreign keys are the invisible threads that knit all the tables in our database together.

It is the foreign keys, telling us how the rows in one table are related to the rows in another table, that turn a database into a relational database.

It is the foreign key that takes data and begins to turn it into information. The book covers what you need to know about Oracle 12c architecture, software tools, and how to successfully manage Oracle databases in the real world. Make the most of Oracle 12c's improved efficiency, stronger security, and simplified management capabilities with Oracle 12c For Dummies. This site comply with DMCA digital copyright. We do not store files not owned by us, or without the permission of the owner.

We also do not have links that lead to sites DMCA copyright infringement. Copy link. Hello I am finding books for dummies. Would you be kind enough if you can send these.

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