Conventions used

There are a number of text conventions used throughout this book.

Code in text: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: “Adding a discriminator between the CUSTOMER supertype and the LOYALTY_CUSTOMER subtype adds context that would otherwise be lost at the database level.”

A block of code is set as follows:

-- Query the change tracking metadata to observe
-- only inserts from the timestamp till now
select * from myTable
changes(information => append_only)
at(timestamp => $cDts);

Bold: Indicates a new term, an important word, or words that you see onscreen. For instance, words in menus or dialog boxes appear in bold. Here is an example: “Subtypes share common characteristics with a supertype entity but have additional attributes that make them distinct.”

Tips or important notes

Appear like this.