Group by pick row with lowest value (price)

Question

I have all the hotel and room price, in these data, I need to fetch the lowest price room among the hotels data, below is my query it is not picking the least price example hotelname3, room2, 5.

SELECT *
FROM (hoteldata)
GROUP BY hotelname
ORDER BY price ASC

Answer 1

尝试这个：

SELECT * FROM hoteldata where price = (SELECT min(price) FROM hoteldata)

Answer 2

SELECT hd.*
FROM (
    SELECT hotelname , MIN(price) as minprice
    FROM hoteldata
    GROUP BY hotelname
) minprices
JOIN hoteldata hd 
    ON  hd.hotelname = minprices.hotelname
    AND hd.price = minprices.minprice

Note: If two rooms in one hotel have the lowest price, they will be listet both.

For performance you should define an index on ( hotelname , price )

http://sqlfiddle.com/#!9/10f00/1

Answer 3

SELECT *
FROM (hoteldata) order by price asc limit 1;

This will work for getting minimum price room from different hotel.