SELECT DATA FROM TABLE :
SELECT
	employeeid,
	firstname,
	lastname,
	title,
	email
FROM
	employees
WHERE
	employeeid = 3;







Update DATA in TABLE :


UPDATE table
SET column_1 = new_value_1,
    column_2 = new_value_2
WHERE
    search_condition 
ORDER column_or_expression
LIMIT row_count OFFSET offset;

Update one column example :
UPDATE employees
SET lastname = 'Smith'
WHERE employeeid = 3;