
Conventions used
There are a number of text conventions used throughout this book.
CodeInText: 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: "Mount the downloaded WebStorm-10*.dmg disk image file as another disk in your system."
A block of code is set as follows:
CREATE USER repuser
SUPERUSER
LOGIN
CONNECTION LIMIT 1
ENCRYPTED PASSWORD 'changeme';
When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:
SELECT *FROM mytable
WHERE (col1, col2, … ,colN) IN
(SELECT col1, col2, … ,colN
FROM mytable
GROUP BY col1, col2, … ,colN
HAVING count(*) > 1);
Any command-line input or output is written as follows:
$ postgres --single -D /full/path/to/datadir postgres
Bold: Indicates a new term, an important word, or words that you see onscreen. For example, words in menus or dialog boxes appear in the text like this. Here is an example: "Select System info from the Administration panel."
Warnings or important notes appear like this.
Tips and tricks appear like this.