SQL Pilih string tidak berfungsi

Permintaan Anda salah:Coba ini

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

ATAU

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

Berdasarkan kebutuhan Anda, gunakan DAN atau ATAU saat memeriksa kursus