Writing our first MySQL code

Type the following lines into the text editor (for the first line, be sure to add a
space after the two hyphens):

— Using SELECT to display messages
SELECT ‘Hello World’;
SELECT ‘MySQL is fun!’;

Now that we know how to execute SQL statements, we are ready to start
learning some SQL commands. However, before we do that, there’s more
one concept that I’ll like to cover – comments.
As mentioned previously, the first line in the code that we wrote (– Using
SELECT to display messages) is a comment.

Comments are written to make our code more readable for other
programmers. They are meant for humans only and are ignored by the
DBMS.

To add comments to our program, we type two hyphens, followed by a space,
as demonstrated in the example above.
Alternatively, we can also use the # symbol as shown below:
# This is another way to add comment

Last, but not least, if we want to type multiple lines comments, we can use
the /*…*/ symbols:

/* This is a comment
This is also a comment
This is the third comment */