Comments are hints that a programmer add to explain the statements and make it more understandable.
It is also used to restrict the execution of some statements.
There are two types of comments:
1. Single Line Comments, &
2. Multi Line Comments.
Single line Comments : Single-line comments Start and ends with(- -).Any text are write between (- -) then, it is ignored (will not be executed).
Example:
-- This will select all students from the table students --
SELECT * FROM students;Multi-line comments:
Multi-line comments start with /* and ends with */.
Any text are write between /* and */ will be ignored .
Example:
/*Select all the columns
of the students table:*/
SELECT * FROM students;