The DELETE FROM statement deletes one or more rows from a table. You can use the statement when you want to delete existing records.

The statement below deletes all records in the students table with no blood_group:

DELETE FROM students
WHERE blood_group IS NULL;

• DELETE FROM is a clause that lets you delete rows from a table.
• students is the name of the table we want to delete rows from.
• WHERE is a clause that lets you select which rows you want to delete. Here we want to delete all of the rows where the blood_group column IS NULL.
• IS NULL is a condition in SQL that returns true when the value is NULL and false otherwise.