SQL

sql is not like

SELECT * FROM emp
  WHERE name NOT LIKE 'a%'			-- not starting with a
  AND name NOT LIKE '%a'			-- not ending with a
  AND name NOT LIKE '%a%'			-- not containing  a
  AND upper(name) NOT LIKE '%A%'	-- not containing  a or A

SQL is not like

SELECT * FROM Student
WHERE FirstName NOT LIKE '%B%'

SQL NOT LIKE Operator

SELECT *
FROM Customers
WHERE country NOT LIKE 'USA';