通配符用于替换字符串中的一个或多个字符。
不同的通配符仅与 LIKE 运算符结合使用。 LIKE 运算符在 WHERE 表达式中使用,用于搜索列中与指定模式匹配的值。
象征 | 描述 | 例子 |
---|---|---|
% | 表示零个或多个字符 | bl% 查找 bl、黑色、蓝色和斑点 |
_ | 代表一个字符 | h_t 发现热门,帽子,然后命中 |
象征 | 描述 | 例子 |
---|---|---|
* | 表示零个或多个字符 | bl* 查找 bl、黑色、蓝色和斑点 |
? | 代表一个字符 | h?t 发现热点,帽子和打击 |
[] | 代表括号内的任意单个字符 | h[oa]t 发现 hot 和 hat,但未击中 |
! | 代表括号外的任意字符 | h[!oa]t 发现击中,但不热和帽子 |
- | 代表指定范围内的任意单个字符 | c[a-b]t 找到 cat 和 cbt |
# | 代表任何单个数字字符 | 2#5 查找 205、215、225、235、245、255、265、275、285 和 295 |
象征 | 描述 | 例子 |
---|---|---|
% | 表示零个或多个字符 | bl% 查找 bl、黑色、蓝色和斑点 |
_ | 代表一个字符 | h_t 发现热门,帽子,然后命中 |
[] | 代表括号内的任意单个字符 | h[oa]t 发现 hot 和 hat,但未击中 |
^ | 代表括号外的任意字符 | h[^oa]t 发现击中,但不是热和帽子 |
- | 代表指定范围内的任意单个字符 | c[a-b]t 找到 cat 和 cbt |
所有通配符还可以以不同的组合使用!
以下是一些示例,显示 LIKE 运算符与“%”和“_”通配符的各种组合:
LIKE 运算符 | 描述 |
---|---|
WHERE CustomerName LIKE 'a%' | 查找以“a”开头的任何值 |
WHERE CustomerName LIKE '%a' | 查找任何以“a”结尾的值 |
WHERE CustomerName LIKE '%or%' | 查找任意位置有“or”的任意值 |
WHERE CustomerName LIKE '_r%' | 查找第二个位置有“r”的任何值 |
WHERE CustomerName LIKE 'a__%' | 查找以“a”开头且至少包含 3 个字符的任何值 |
WHERE ContactName LIKE 'a%o' | 查找以“a”开头并以“o”结尾的任何值 |
下表显示了训练数据库 Northwind 中的整个表“Customers”:
CustomerID | CustomerName | ContactName | Address | City | PostalCode | Country |
---|---|---|---|---|---|---|
1 | Alfreds Futterkiste | Maria Anders | Obere Str. 57 | Berlin | 12209 | Germany |
2 | Ana Trujillo Emparedados y helados | Ana Trujillo | Avda. de la Constitución 2222 | México D.F. | 5021 | Mexico |
3 | Antonio Moreno Taquería | Antonio Moreno | Mataderos 2312 | México D.F. | 5023 | Mexico |
4 | Around the Horn | Thomas Hardy | 120 Hanover Sq. | London | WA1 1DP | UK |
5 | Berglunds snabbköp | Christina Berglund | Berguvsvägen 8 | Luleå | S-958 22 | Sweden |
6 | Blauer See Delikatessen | Hanna Moos | Forsterstr. 57 | Mannheim | 68306 | Germany |
7 | Blondel père et fils | Frédérique Citeaux | 24, place Kléber | Strasbourg | 67000 | France |
8 | Bólido Comidas preparadas | Martín Sommer | C/ Araquil, 67 | Madrid | 28023 | Spain |
9 | Bon app' | Laurence Lebihans | 12, rue des Bouchers | Marseille | 13008 | France |
10 | Bottom-Dollar Marketse | Elizabeth Lincoln | 23 Tsawassen Blvd. | Tsawassen | T2F 8M4 | Canada |
11 | B's Beverages | Victoria Ashworth | Fauntleroy Circus | London | EC2 5NT | UK |
12 | Cactus Comidas para llevar | Patricio Simpson | Cerrito 333 | Buenos Aires | 1010 | Argentina |
13 | Centro comercial Moctezuma | Francisco Chang | Sierras de Granada 9993 | México D.F. | 5022 | Mexico |
14 | Chop-suey Chinese | Yang Wang | Hauptstr. 29 | Bern | 3012 | Switzerland |
15 | Comércio Mineiro | Pedro Afonso | Av. dos Lusíadas, 23 | São Paulo | 05432-043 | Brazil |
16 | Consolidated Holdings | Elizabeth Brown | Berkeley Gardens 12 Brewery | London | WX1 6LT | UK |
17 | Drachenblut Delikatessend | Sven Ottlieb | Walserweg 21 | Aachen | 52066 | Germany |
18 | Du monde entier | Janine Labrune | 67, rue des Cinquante Otages | Nantes | 44000 | France |
19 | Eastern Connection | Ann Devon | 35 King George | London | WX3 6FW | UK |
20 | Ernst Handel | Roland Mendel | Kirchgasse 6 | Graz | 8010 | Austria |
21 | Familia Arquibaldo | Aria Cruz | Rua Orós, 92 | São Paulo | 05442-030 | Brazil |
22 | FISSA Fabrica Inter. Salchichas S.A. | Diego Roel | C/ Moralzarzal, 86 | Madrid | 28034 | Spain |
23 | Folies gourmandes | Martine Rancé | 184, chaussée de Tournai | Lille | 59000 | France |
24 | Folk och fä HB | Maria Larsson | Åkergatan 24 | Bräcke | S-844 67 | Sweden |
25 | Frankenversand | Peter Franken | Berliner Platz 43 | München | 80805 | Germany |
26 | France restauration | Carine Schmitt | 54, rue Royale | Nantes | 44000 | France |
27 | Franchi S.p.A. | Paolo Accorti | Via Monte Bianco 34 | Torino | 10100 | Italy |
28 | Furia Bacalhau e Frutos do Mar | Lino Rodriguez | Jardim das rosas n. 32 | Lisboa | 1675 | Portugal |
29 | Galería del gastrónomo | Eduardo Saavedra | Rambla de Cataluña, 23 | Barcelona | 8022 | Spain |
30 | Godos Cocina Típica | José Pedro Freyre | C/ Romero, 33 | Sevilla | 41101 | Spain |
31 | Gourmet Lanchonetes | André Fonseca | Av. Brasil, 442 | Campinas | 04876-786 | Brazil |
32 | Great Lakes Food Market | Howard Snyder | 2732 Baker Blvd. | Eugene | 97403 | USA |
33 | GROSELLA-Restaurante | Manuel Pereira | 5ª Ave. Los Palos Grandes | Caracas | 1081 | Venezuela |
34 | Hanari Carnes | Mario Pontes | Rua do Paço, 67 | Rio de Janeiro | 05454-876 | Brazil |
35 | HILARIÓN-Abastos | Carlos Hernández | Carrera 22 con Ave. Carlos Soublette #8-35 | San Cristóbal | 5022 | Venezuela |
36 | Hungry Coyote Import Store | Yoshi Latimer | City Center Plaza 516 Main St. | Elgin | 97827 | USA |
37 | Hungry Owl All-Night Grocers | Patricia McKenna | 8 Johnstown Road | Cork | Ireland | |
38 | Island Trading | Helen Bennett | Garden House Crowther Way | Cowes | PO31 7PJ | UK |
39 | Königlich Essen | Philip Cramer | Maubelstr. 90 | Brandenburg | 14776 | Germany |
40 | La corne d'abondance | Daniel Tonini | 67, avenue de l'Europe | Versailles | 78000 | France |
41 | La maison d'Asie | Annette Roulet | 1 rue Alsace-Lorraine | Toulouse | 31000 | France |
42 | Laughing Bacchus Wine Cellars | Yoshi Tannamuri | 1900 Oak St. | Vancouver | V3F 2K1 | Canada |
43 | Lazy K Kountry Store | John Steel | 12 Orchestra Terrace | Walla Walla | 99362 | USA |
44 | Lehmanns Marktstand | Renate Messner | Magazinweg 7 | Frankfurt a.M. | 60528 | Germany |
45 | Let's Stop N Shop | Jaime Yorres | 87 Polk St. Suite 5 | San Francisco | 94117 | USA |
46 | LILA-Supermercado | Carlos González | Carrera 52 con Ave. Bolívar #65-98 Llano Largo | Barquisimeto | 3508 | Venezuela |
47 | LINO-Delicateses | Felipe Izquierdo | Ave. 5 de Mayo Porlamar | I. de Margarita | 4980 | Venezuela |
48 | Lonesome Pine Restaurant | Fran Wilson | 89 Chiaroscuro Rd. | Portland | 97219 | USA |
49 | Magazzini Alimentari Riuniti | Giovanni Rovelli | Via Ludovico il Moro 22 | Bergamo | 24100 | Italy |
50 | Maison Dewey | Catherine Dewey | Rue Joseph-Bens 532 | Bruxelles | B-1180 | Belgium |
51 | Mère Paillarde | Jean Fresnière | 43 rue St. Laurent | Montréal | H1J 1C3 | Canada |
52 | Morgenstern Gesundkost | Alexander Feuer | Heerstr. 22 | Leipzig | 4179 | Germany |
53 | North/South | Simon Crowther | South House 300 Queensbridge | London | SW7 1RZ | UK |
54 | Océano Atlántico Ltda. | Yvonne Moncada | Ing. Gustavo Moncada 8585 Piso 20-A | Buenos Aires | 1010 | Argentina |
55 | Old World Delicatessen | Rene Phillips | 2743 Bering St. | Anchorage | 99508 | USA |
56 | Ottilies Käseladen | Henriette Pfalzheim | Mehrheimerstr. 369 | Köln | 50739 | Germany |
57 | Paris spécialités | Marie Bertrand | 265, boulevard Charonne | Paris | 75012 | France |
58 | Pericles Comidas clásicas | Guillermo Fernández | Calle Dr. Jorge Cash 321 | México D.F. | 5033 | Mexico |
59 | Piccolo und mehr | Georg Pipps | Geislweg 14 | Salzburg | 5020 | Austria |
60 | Princesa Isabel Vinhoss | Isabel de Castro | Estrada da saúde n. 58 | Lisboa | 1756 | Portugal |
61 | Que Delícia | Bernardo Batista | Rua da Panificadora, 12 | Rio de Janeiro | 02389-673 | Brazil |
62 | Queen Cozinha | Lúcia Carvalho | Alameda dos Canàrios, 891 | São Paulo | 05487-020 | Brazil |
63 | QUICK-Stop | Horst Kloss | Taucherstraße 10 | Cunewalde | 1307 | Germany |
64 | Rancho grande | Sergio Gutiérrez | Av. del Libertador 900 | Buenos Aires | 1010 | Argentina |
65 | Rattlesnake Canyon Grocery | Paula Wilson | 2817 Milton Dr. | Albuquerque | 87110 | USA |
66 | Reggiani Caseifici | Maurizio Moroni | Strada Provinciale 124 | Reggio Emilia | 42100 | Italy |
67 | Ricardo Adocicados | Janete Limeira | Av. Copacabana, 267 | Rio de Janeiro | 02389-890 | Brazil |
68 | Richter Supermarkt | Michael Holz | Grenzacherweg 237 | Genève | 1203 | Switzerland |
69 | Romero y tomillo | Alejandra Camino | Gran Vía, 1 | Madrid | 28001 | Spain |
70 | Santé Gourmet | Jonas Bergulfsen | Erling Skakkes gate 78 | Stavern | 4110 | Norway |
71 | Save-a-lot Markets | Jose Pavarotti | 187 Suffolk Ln. | Boise | 83720 | USA |
72 | Seven Seas Imports | Hari Kumar | 90 Wadhurst Rd. | London | OX15 4NB | UK |
73 | Simons bistro | Jytte Petersen | Vinbæltet 34 | København | 1734 | Denmark |
74 | Spécialités du monde | Dominique Perrier | 25, rue Lauriston | Paris | 75016 | France |
75 | Split Rail Beer & Ale | Art Braunschweiger | P.O. Box 555 | Lander | 82520 | USA |
76 | Suprêmes délices | Pascale Cartrain | Boulevard Tirou, 255 | Charleroi | B-6000 | Belgium |
77 | The Big Cheese | Liz Nixon | 89 Jefferson Way Suite 2 | Portland | 97201 | USA |
78 | The Cracker Box | Liu Wong | 55 Grizzly Peak Rd. | Butte | 59801 | USA |
79 | Toms Spezialitäten | Karin Josephs | Luisenstr. 48 | Münster | 44087 | Germany |
80 | Tortuga Restaurante | Miguel Angel Paolino | Avda. Azteca 123 | México D.F. | 5033 | Mexico |
81 | Tradição Hipermercados | Anabela Domingues | Av. Inês de Castro, 414 | São Paulo | 05634-030 | Brazil |
82 | Trail's Head Gourmet Provisioners | Helvetius Nagy | 722 DaVinci Blvd. | Kirkland | 98034 | USA |
83 | Vaffeljernet | Palle Ibsen | Smagsløget 45 | Århus | 8200 | Denmark |
84 | Victuailles en stock | Mary Saveley | 2, rue du Commerce | Lyon | 69004 | France |
85 | Vins et alcools Chevalier | Paul Henriot | 59 rue de l'Abbaye | Reims | 51100 | France |
86 | Die Wandernde Kuh | Rita Müller | Adenauerallee 900 | Stuttgart | 70563 | Germany |
87 | Wartian Herkku | Pirkko Koskitalo | Torikatu 38 | Oulu | 90110 | Finland |
88 | Wellington Importadora | Paula Parente | Rua do Mercado, 12 | Resende | 08737-363 | Brazil |
89 | White Clover Markets | Karl Jablonski | 305 - 14th Ave. S. Suite 3B | Seattle | 98128 | USA |
90 | Wilman Kala | Matti Karttunen | Keskuskatu 45 | Helsinki | 21240 | Finland |
91 | Wolski | Zbyszek | ul. Filtrowa 68 | Walla | 01-012 | Poland |
以下 SQL 语句选择 City(城市)以“ber”开头的所有客户:
Run SQLSELECT * FROM Customers
WHERE City LIKE 'ber%'
以下 SQL 语句从包含模式“es”的城市中选择所有客户:
Run SQLSELECT * FROM Customers
WHERE City LIKE '%es%'
以下 SQL 语句选择城市以任意字符开头后跟“ondon”的所有客户:
Run SQLSELECT * FROM Customers
WHERE City LIKE '_ondon'
以下 SQL 语句选择城市以“L”开头、后跟任意字符、后跟“n”、后跟任意字符、后跟“on”的所有客户:
Run SQLSELECT * FROM Customers
WHERE City LIKE 'L_n_on'
以下 SQL 语句选择城市以“b”、“s”或“p”开头的所有客户:
SELECT * FROM Customers
WHERE City LIKE '[bsp]%'
以下 SQL 语句选择城市以“a”、“b”或“c”开头的所有客户:
SELECT * FROM Customers
WHERE City LIKE '[a-c]%'
以下两个 SQL 语句选择城市不以“b”、“s”或“p”开头的所有客户:
SELECT * FROM Customers
WHERE City LIKE '[!bsp]%'
或者:
SELECT * FROM Customers
WHERE City NOT LIKE '[bsp]%'