Mysql 如何以简洁优雅的方式编写sql查询？

我有一个庞大的数据库：

#
# Dropping tables
#

DROP TABLE IF EXISTS hotels;
DROP TABLE IF EXISTS guests;
DROP TABLE IF EXISTS rooms;
DROP TABLE IF EXISTS reservation;

#
# Table structure for tables hotels, guests, rooms and reservation
#

CREATE TABLE hotels(
hotel_code int(4) unsigned NOT NULL default '0',
hotel_name char(20) default NULL,
city char(20) default NULL,
address char(20) default NULL,
hotel_rank int(1) unsigned NOT NULL default '0',
phone char(10) default NULL,
number_of_rooms int(4) unsigned NOT NULL default '0',
PRIMARY KEY  (hotel_code));

CREATE TABLE guests(
id char(10) default NULL,
name char(20) default NULL,
city char(20) default NULL,
address char(20) default NULL,
state char(20) default NULL,
PRIMARY KEY  (id));

CREATE TABLE rooms(
hotel_code int(4) unsigned NOT NULL default '0',
room_number int(4) unsigned NOT NULL default '0',
type char(20) default NULL,
beds int(4) unsigned NOT NULL default '0',
price int(4) unsigned NOT NULL default '0',
PRIMARY KEY  (hotel_code, room_number));

CREATE TABLE reservation(
hotel_code int(4) unsigned NOT NULL default '0',
room_number int(4) unsigned NOT NULL default '0',
from_date char(20) default NULL,
to_date char(20) default NULL,
payment_method char(20) default NULL,
id char(10) default NULL,
PRIMARY KEY  (hotel_code, room_number, from_date));

#
# Dumping data for tables hotels, guests, rooms and reservation
#

INSERT INTO hotels VALUES
(1, 'Meridian', 'Tel Aviv', 'Shinkin 24', 3, '03-6527384', 230),
(2, 'Meridian', 'Tveria', 'Kineret 22', 5, '04-7369944', 320),
(3, 'King David', 'Jerusalem', 'Kineret 22', 5, '02-7435334', 200),
(4, 'Hilton', 'Jerusalem', 'Kineret 22', 4, '02-4566324', 180),
(5, 'Herods', 'Eilat', 'Dolphin 14', 4, '09-7333245', 190),
(6, 'Hof Yam', 'Haifa', 'Kasam 39', 5, '04-7344545', 150),
(7, 'Ha Tsuk', 'Haifa', 'Lohem 17', 3, '04-7345678', 110),
(8, 'Ha Nesiha', 'Eilat', 'Suf 4', 5, '09-6543543', 170),
(9, 'King David', 'Tveria', 'Kineret 55', 5, '04-7445544', 270);

INSERT INTO guests VALUES
('00000001-0', 'Adam', 'Gan Eden', 'Mango 3', 'Israel'),
('00000002-0', 'Eve', 'Gan Eden', 'Avucado 12', 'Israel'),
('04352244-4', 'Dani Mor', 'Tel Aviv', 'Magen 3', 'Israel'),
('06112343-6', 'Amiad Rozenberg', 'Petah Tikva', 'Zahal 14', 'Israel'),
('12345678-0', 'Ehud Olmert', 'Jerusalem', 'Money 99', 'Israel'),
('87654321-0', 'Moris Talenski', 'Jerusalem', 'Money 100', 'Israel'),
('04256372-0', 'Uri Meser', 'Holyland', 'Money 101', 'Israel'),
('02637482-0', 'Shula Zaken', 'Jerusalem', 'Money 102', 'Israel'),
('00000000-0', 'Gimel', 'Mosad', 'Secret 007', 'Dubai');

INSERT INTO rooms VALUES
(1, 100, 'basic', 2, 100),
(1, 101, 'basic', 2, 100),
(1, 102, 'basic', 2, 100),
(1, 200, 'double', 2, 100),
(1, 201, 'double', 2, 100),
(1, 202, 'double', 2, 100),
(1, 300, 'truple', 3, 180),
(1, 400, 'honeymoon', 2, 270),
(2, 100, 'basic', 2, 100),
(2, 200, 'double', 4, 200),
(2, 201, 'double', 4, 200),
(2, 202, 'double', 4, 200),
(2, 300, 'truple', 5, 220),
(2, 400, 'honeymoon', 3, 230),
(2, 401, 'honeymoon', 3, 230),
(3, 100, 'basic', 2, 100),
(3, 200, 'double', 2, 210),
(3, 201, 'double', 2, 210),
(3, 202, 'double', 2, 210),
(3, 300, 'truple', 4, 220),
(3, 400, 'honeymoon', 3, 230),
(4, 100, 'basic', 2, 100),
(4, 200, 'double', 1, 500),
(4, 300, 'truple', 4, 120),
(4, 301, 'truple', 4, 120),
(4, 400, 'honeymoon', 3, 230),
(4, 401, 'honeymoon', 3, 230),
(4, 402, 'honeymoon', 3, 230),
(4, 403, 'honeymoon', 3, 230),
(5, 100, 'basic', 2, 100),
(5, 200, 'double', 4, 150),
(5, 300, 'truple', 4, 340),
(5, 400, 'honeymoon', 3, 210),
(6, 100, 'basic', 2, 100),
(6, 101, 'basic', 2, 100),
(6, 200, 'double', 3, 110),
(6, 201, 'double', 3, 110),
(6, 300, 'truple', 4, 310),
(6, 400, 'honeymoon', 1, 240),
(7, 100, 'basic', 2, 100),
(7, 101, 'basic', 2, 100),
(7, 102, 'basic', 2, 100),
(7, 200, 'double', 4, 130),
(7, 300, 'truple', 2, 250),
(7, 301, 'truple', 2, 250),
(7, 302, 'truple', 2, 250),
(7, 400, 'honeymoon', 3, 280),
(8, 100, 'basic', 2, 90),
(8, 200, 'double', 4, 290),
(8, 300, 'truple', 2, 430),
(8, 400, 'honeymoon', 3, 150),
(9, 100, 'basic', 2, 130),
(9, 200, 'double', 4, 150),
(9, 300, 'truple', 2, 280),
(9, 400, 'honeymoon', 3, 270);

INSERT INTO reservation VALUES
(6, 300, '2010-06-15', '2010-06-29', 'cash', '00000001-0'),
(5, 400, '2010-01-02', '2010-01-13', 'credit', '00000001-0'),
(4, 300, '2010-06-15', '2010-07-01', 'cash', '00000002-0'),
(5, 400, '2010-01-01', '2010-01-13', 'credit', '00000002-0'),
(3, 200, '2010-06-15', '2010-08-01', 'cash', '04352244-4'),
(2, 100, '2010-04-15', '2010-06-21', 'cash', '06112343-6'),
(1, 100, '2010-06-23', '2010-07-01', 'cash', '06112343-6'),
(8, 300, '2010-04-12', '2010-04-15', 'cash', '12345678-0'),
(8, 200, '2010-04-12', '2010-04-15', 'cash', '87654321-0'),
(8, 100, '2010-04-12', '2010-04-15', 'cash', '04256372-0'),
(8, 200, '2010-04-17', '2010-04-25', 'cash', '04256372-0'),
(8, 200, '2010-04-25', '2010-04-29', 'cash', '02637482-0');

我想写一个查询：

present a list of the hotels with more than 2 rooms , where their price is 
bigger than 186 . 
Order it by : hotel name ,city ,number of rooms . Sort by number of rooms .

所以我的问题是：

SELECT DISTINCT hotel_name, city, rooms_number
FROM hotels JOIN
(SELECT DISTINCT hotel_code, COUNT(*) as rooms_number
FROM rooms
WHERE price > 186
GROUP BY hotel_code
) as rooms_count
ON (hotels.hotel_code = rooms_count.hotel_code AND rooms_number > 2)
ORDER BY rooms_number;

但是这个查询太长了，有没有可能用另一种方式来写呢

---

符合问题的需要

您可以通过使用

HAVING

子句来避免子选择

SELECT
    a.hotel_name,
    a.city,
    COUNT(*) AS room_count
FROM 
    hotels a
INNER JOIN
    rooms b ON a.hotel_code = b.hotel_code AND b.price > 186
GROUP BY
    a.hotel_name,
    a.city
HAVING
    COUNT(*) > 2
ORDER BY
    room_count DESC

---

这个查询离“太长了”还差得很远。房间数是指总房间数还是仅仅指价格超过186的房间数？@ZaneBien:房间数超过2间、价格超过186的酒店想看一个长查询吗？看，谢谢，但这给了我一个错误，你确定这样行吗？顺便问一下，DESC是什么意思？错误说明了什么<代码>描述表示按降序排序。