Job-Ready SQL in an Afternoon - Comments

The video tutorial emphasizes the importance of leaving comments in code to aid understanding, especially when revisiting complex code after some time. It covers basic and advanced commenting techniques, including single-line and multiline comments, and highlights the use of tools like DataGrip. The tutorial also provides guidelines for effective commenting, stressing the need for clarity and relevance to ensure that both the original coder and others can easily comprehend the code's logic and purpose.

Why are comments considered crucial in complex code?

• They are required by all programming languages.

• They increase the file size.

• They make the code run faster.

• They help in understanding the code later.

What is the correct way to start a single-line comment in SQL?

• Using a semicolon (;)

• Using a hash (#)

• Using a double dash (--)

• Using a slash (/)

What is a limitation of single-line comments in SQL?

• They require a special editor to view.

• They can only be used at the end of a query.

• They do not extend to the next line.

• They cannot be used in SQL.

How can you write a multi-line comment in SQL?

• Using a hash (#) at the start of each line

• Using /* to start and */ to end

• Using // to start and end

• Using -- at the start of each line

What is the main purpose of comments in code?

• To explain complex parts of the code

• To confuse other developers

• To make the code look longer

• To replace documentation

When should you avoid writing comments?

• When the code is complex

• When the code is written in SQL

• When the code is self-explanatory

• When the code is for personal use

What should a good comment explain?

• The history of the programming language

• The number of lines in the code

• The logic and thought process behind the code

• The syntax of the language