Řetězec SQL Select nefunguje

Váš dotaz je chybný:Zkuste toto

SELECT Comment1, Comment2, Comment3, Comment4 
FROM Students 
WHERE Course1 = '$value1' AND Course2 = '$value1' 
AND Course3 = '$value1' AND Course4 = '$value1'

NEBO

SELECT Comment1, Comment2, Comment3, Comment4 
FROM Students 
WHERE Course1 = '$value1' OR Course2 = '$value1' 
OR Course3 = '$value1' OR Course4 = '$value1'

Na základě vašeho požadavku použijte AND nebo OR při kontrole kurzu