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mysql優化之前綴索引--帶案例分析

2020-12-14 11:35:54 資料庫

為什么要有前綴索引

有時候需要索引很長的字串，這會讓索引變的大且慢，通常情況下可以使用某個列開始的部分字串，這樣大大的節約索引空間，從而提高索引效率，但這會降低索引的選擇性，索引的選擇性是指不重復的索引值和資料表記錄總數的比值，范圍從1/#T到1之間，索引的選擇性越高則查詢效率越高，因為選擇性更高的索引可以讓mysql在查找的時候過濾掉更多的行，

一般情況下某個列前綴的選擇性也是足夠高的，足以滿足查詢的性能，但是對應BLOB,TEXT,VARCHAR型別的列，必須要使用前綴索引，因為mysql不允許索引這些列的完整長度，使用該方法的訣竅在于要選擇足夠長的前綴以保證較高的選擇性，通過又不能太長，

案例：

說明：用到的city表是mysql官網上的sakila，可以直接上官網上下載然后匯入，(也可以點我下載），也可以移到文章最下面我把建表陳述句跟插入陳述句提供給大家

創建資料表，插入資料

mysql> create table citydemo(city varchar(50) not null);
Query OK, 0 rows affected (0.32 sec)

mysql> insert into citydemo(city) select city from city;

重復執行5次下面的sql陳述句

mysql> insert into citydemo(city) select city from citydemo;
insert into citydemo(city) select city from citydemo;
insert into citydemo(city) select city from citydemo;
insert into citydemo(city) select city from citydemo;
insert into citydemo(city) select city from citydemo;

更新城市表的名稱，隨機更新

mysql> update citydemo set city=(select city from city order by rand() limit 1);
Query OK, 19164 rows affected (9.30 sec)

查找最常見的城市串列，發現每個值都出現45-65次，

mysql> select count(*) as cnt,city from citydemo group by city order by cnt desc limit 10;
+-----+----------------------+
| cnt | city                 |
+-----+----------------------+
|  66 | London               |
|  53 | Buenaventura         |
|  48 | Cam Ranh             |
|  47 | Funafuti             |
|  47 | Mandi Bahauddin      |
|  46 | Shivapuri            |
|  46 | San Miguel de Tucumn |
|  46 | Novi Sad             |
|  46 | San Lorenzo          |
|  46 | Kanchrapara          |
+-----+----------------------+
10 rows in set (0.02 sec)

查找最頻繁出現的城市前綴，先從3個前綴字母開始，發現比原來出現的次數更多很多，一直往下加，可以分別截取多個字符查看城市出現的次數，加到7左右發現前綴的選擇性接近于完整列的選擇性

mysql> select count(*) as cnt,left(city,3) as pref from citydemo group by pref order by cnt desc limit 10;
+-----+------+
| cnt | pref |
+-----+------+
| 465 | San  |
| 185 | Cha  |
| 167 | Tan  |
| 166 | Sal  |
| 156 | al-  |
| 154 | Sou  |
| 148 | Man  |
| 147 | Shi  |
| 132 | Val  |
| 131 | Bat  |
+-----+------+
10 rows in set (0.02 sec)

mysql> select count(*) as cnt,left(city,7) as pref from citydemo group by pref order by cnt desc limit 10;
+-----+---------+
| cnt | pref    |
+-----+---------+
|  74 | San Fel |
|  66 | London  |
|  58 | Valle d |
|  55 | Santiag |
|  53 | Buenave |
|  48 | Cam Ran |
|  47 | Mandi B |
|  47 | Funafut |
|  46 | Novi Sa |
|  46 | San Mig |
+-----+---------+
10 rows in set (0.02 sec)

可以通過下面這種方式來計算完整列的選擇性，可以看到當前綴長度到達7之后，再增加前綴長度，選擇性提升的幅度已經很小了，所以選擇7

mysql> select count(distinct left(city,3))/count(*) as sel3,
    -> count(distinct left(city,4))/count(*) as sel4,
    -> count(distinct left(city,5))/count(*) as sel5,
    -> count(distinct left(city,6))/count(*) as sel6,
    -> count(distinct left(city,7))/count(*) as sel7,
    -> count(distinct left(city,8))/count(*) as sel8
    -> from citydemo;
+--------+--------+--------+--------+--------+--------+
| sel3   | sel4   | sel5   | sel6   | sel7   | sel8   |
+--------+--------+--------+--------+--------+--------+
| 0.0239 | 0.0293 | 0.0305 | 0.0309 | 0.0310 | 0.0310 |
+--------+--------+--------+--------+--------+--------+
1 row in set (0.06 sec)

計算完成之后創建前綴索引

mysql> alter table citydemo add key(city(7));
Query OK, 0 rows affected, 1 warning (0.70 sec)
Records: 0  Duplicates: 0  Warnings: 1

注意：前綴索引是一種能使索引更小更快的有效方法，但是也包含缺點：mysql無法使用前綴索引做order by 和 group by，

city表結構資料：

CREATE TABLE `city` (
  `city_id` smallint(5) unsigned NOT NULL AUTO_INCREMENT,
  `city` varchar(50) NOT NULL,
  `country_id` smallint(5) unsigned NOT NULL,
  `last_update` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`city_id`),
  KEY `idx_fk_country_id` (`country_id`),
  CONSTRAINT `fk_city_country` FOREIGN KEY (`country_id`) REFERENCES `country` (`country_id`) ON DELETE RESTRICT ON UPDATE CASCADE
) ENGINE=InnoDB AUTO_INCREMENT=601 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;


INSERT INTO `city` VALUES (1, 'A Corua (La Corua)', 87, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (2, 'Abha', 82, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (3, 'Abu Dhabi', 101, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (4, 'Acua', 60, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (5, 'Adana', 97, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (6, 'Addis Abeba', 31, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (7, 'Aden', 107, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (8, 'Adoni', 44, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (9, 'Ahmadnagar', 44, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (10, 'Akishima', 50, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (11, 'Akron', 103, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (12, 'al-Ayn', 101, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (13, 'al-Hawiya', 82, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (14, 'al-Manama', 11, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (15, 'al-Qadarif', 89, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (16, 'al-Qatif', 82, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (17, 'Alessandria', 49, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (18, 'Allappuzha (Alleppey)', 44, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (19, 'Allende', 60, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (20, 'Almirante Brown', 6, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (21, 'Alvorada', 15, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (22, 'Ambattur', 44, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (23, 'Amersfoort', 67, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (24, 'Amroha', 44, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (25, 'Angra dos Reis', 15, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (26, 'Anpolis', 15, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (27, 'Antofagasta', 22, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (28, 'Aparecida de Goinia', 15, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (29, 'Apeldoorn', 67, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (30, 'Araatuba', 15, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (31, 'Arak', 46, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (32, 'Arecibo', 77, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (33, 'Arlington', 103, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (34, 'Ashdod', 48, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (35, 'Ashgabat', 98, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (36, 'Ashqelon', 48, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (37, 'Asuncin', 73, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (38, 'Athenai', 39, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (39, 'Atinsk', 80, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (40, 'Atlixco', 60, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (41, 'Augusta-Richmond County', 103, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (42, 'Aurora', 103, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (43, 'Avellaneda', 6, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (44, 'Bag', 15, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (45, 'Baha Blanca', 6, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (46, 'Baicheng', 23, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (47, 'Baiyin', 23, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (48, 'Baku', 10, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (49, 'Balaiha', 80, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (50, 'Balikesir', 97, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (51, 'Balurghat', 44, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (52, 'Bamenda', 19, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (53, 'Bandar Seri Begawan', 16, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (54, 'Banjul', 37, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (55, 'Barcelona', 104, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (56, 'Basel', 91, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (57, 'Bat Yam', 48, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (58, 'Batman', 97, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (59, 'Batna', 2, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (60, 'Battambang', 18, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (61, 'Baybay', 75, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (62, 'Bayugan', 75, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (63, 'Bchar', 2, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (64, 'Beira', 63, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (65, 'Bellevue', 103, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (66, 'Belm', 15, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (67, 'Benguela', 4, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (68, 'Beni-Mellal', 62, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (69, 'Benin City', 69, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (70, 'Bergamo', 49, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (71, 'Berhampore (Baharampur)', 44, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (72, 'Bern', 91, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (73, 'Bhavnagar', 44, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (74, 'Bhilwara', 44, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (75, 'Bhimavaram', 44, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (76, 'Bhopal', 44, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (77, 'Bhusawal', 44, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (78, 'Bijapur', 44, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (79, 'Bilbays', 29, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (80, 'Binzhou', 23, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (81, 'Birgunj', 66, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (82, 'Bislig', 75, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (83, 'Blumenau', 15, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (84, 'Boa Vista', 15, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (85, 'Boksburg', 85, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (86, 'Botosani', 78, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (87, 'Botshabelo', 85, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (88, 'Bradford', 102, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (89, 'Braslia', 15, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (90, 'Bratislava', 84, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (91, 'Brescia', 49, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (92, 'Brest', 34, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (93, 'Brindisi', 49, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (94, 'Brockton', 103, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (95, 'Bucuresti', 78, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (96, 'Buenaventura', 24, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (97, 'Bydgoszcz', 76, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (98, 'Cabuyao', 75, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (99, 'Callao', 74, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (100, 'Cam Ranh', 105, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (101, 'Cape Coral', 103, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (102, 'Caracas', 104, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (103, 'Carmen', 60, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (104, 'Cavite', 75, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (105, 'Cayenne', 35, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (106, 'Celaya', 60, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (107, 'Chandrapur', 44, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (108, 'Changhwa', 92, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (109, 'Changzhou', 23, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (110, 'Chapra', 44, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (111, 'Charlotte Amalie', 106, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (112, 'Chatsworth', 85, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (113, 'Cheju', 86, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (114, 'Chiayi', 92, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (115, 'Chisinau', 61, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (116, 'Chungho', 92, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (117, 'Cianjur', 45, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (118, 'Ciomas', 45, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (119, 'Ciparay', 45, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (120, 'Citrus Heights', 103, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (121, 'Citt del Vaticano', 41, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (122, 'Ciudad del Este', 73, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (123, 'Clarksville', 103, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (124, 'Coacalco de Berriozbal', 60, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (125, 'Coatzacoalcos', 60, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (126, 'Compton', 103, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (127, 'Coquimbo', 22, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (128, 'Crdoba', 6, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (129, 'Cuauhtmoc', 60, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (130, 'Cuautla', 60, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (131, 'Cuernavaca', 60, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (132, 'Cuman', 104, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (133, 'Czestochowa', 76, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (134, 'Dadu', 72, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (135, 'Dallas', 103, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (136, 'Datong', 23, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (137, 'Daugavpils', 54, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (138, 'Davao', 75, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (139, 'Daxian', 23, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (140, 'Dayton', 103, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (141, 'Deba Habe', 69, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (142, 'Denizli', 97, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (143, 'Dhaka', 12, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (144, 'Dhule (Dhulia)', 44, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (145, 'Dongying', 23, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (146, 'Donostia-San Sebastin', 87, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (147, 'Dos Quebradas', 24, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (148, 'Duisburg', 38, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (149, 'Dundee', 102, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (150, 'Dzerzinsk', 80, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (151, 'Ede', 67, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (152, 'Effon-Alaiye', 69, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (153, 'El Alto', 14, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (154, 'El Fuerte', 60, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (155, 'El Monte', 103, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (156, 'Elista', 80, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (157, 'Emeishan', 23, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (158, 'Emmen', 67, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (159, 'Enshi', 23, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (160, 'Erlangen', 38, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (161, 'Escobar', 6, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (162, 'Esfahan', 46, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (163, 'Eskisehir', 97, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (164, 'Etawah', 44, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (165, 'Ezeiza', 6, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (166, 'Ezhou', 23, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (167, 'Faaa', 36, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (168, 'Fengshan', 92, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (169, 'Firozabad', 44, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (170, 'Florencia', 24, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (171, 'Fontana', 103, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (172, 'Fukuyama', 50, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (173, 'Funafuti', 99, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (174, 'Fuyu', 23, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (175, 'Fuzhou', 23, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (176, 'Gandhinagar', 44, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (177, 'Garden Grove', 103, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (178, 'Garland', 103, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (179, 'Gatineau', 20, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (180, 'Gaziantep', 97, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (181, 'Gijn', 87, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (182, 'Gingoog', 75, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (183, 'Goinia', 15, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (184, 'Gorontalo', 45, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (185, 'Grand Prairie', 103, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (186, 'Graz', 9, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (187, 'Greensboro', 103, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (188, 'Guadalajara', 60, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (189, 'Guaruj', 15, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (190, 'guas Lindas de Gois', 15, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (191, 'Gulbarga', 44, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (192, 'Hagonoy', 75, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (193, 'Haining', 23, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (194, 'Haiphong', 105, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (195, 'Haldia', 44, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (196, 'Halifax', 20, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (197, 'Halisahar', 44, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (198, 'Halle/Saale', 38, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (199, 'Hami', 23, '2006-2-15 04:45:25');
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INSERT INTO `city` VALUES (589, 'York', 102, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (590, 'Yuncheng', 23, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (591, 'Yuzhou', 23, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (592, 'Zalantun', 23, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (593, 'Zanzibar', 93, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (594, 'Zaoyang', 23, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (595, 'Zapopan', 60, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (596, 'Zaria', 69, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (597, 'Zeleznogorsk', 80, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (598, 'Zhezqazghan', 51, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (599, 'Zhoushan', 23, '2006-2-15 04:45:25');
INSERT INTO `city` VALUES (600, 'Ziguinchor', 83, '2006-2-15 04:45:25');

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