MySQL - बदलें OR से AND

आप having . के साथ प्रयास कर सकते हैं :

SELECT Ads.AdId 
FROM Ads 
JOIN AdsAmenities ON Ads.AdId = AdsAmenities.ads_AdId 
WHERE AdsAmenities.amenities_AmenityId IN (2, 18, 1) 
GROUP BY Ads.AdId
HAVING COUNT(distinct AdsAmenities.amenities_AmenityId) = 3

मामले में AdsAmenities.amenities_AmenityId मान uniq हैं, आप distinct . छोड़ सकते हैं भाग।