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MySQL- tutoriaal

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MySQL SQL

MySQL SQL MySQL KIES MySQL WAAR MySQL EN, OF, NIE MySQL BESTEL DEUR MySQL VOEG IN MySQL NULL-waardes MySQL-OPDATERING MySQL SKEE MySQL-LIMIET MySQL MIN en MAX MySQL COUNT, AVG, SUM MySQL LIKE MySQL Wildcards MySQL IN MySQL TUSSEN MySQL aliasse MySQL sluit aan MySQL BINNE SLUIT AAN MySQL LOS LINKS AAN MySQL REGS SLUIT AAN MySQL KRUIS SLUIT AAN MySQL Self Sluit aan MySQL UNIE MySQL GROEP DEUR MySQL HET MySQL BESTAAN MySQL ENIGE, ALMAL MySQL INSERT SELECT MySQL-GEVAL MySQL nul-funksies MySQL-kommentaar MySQL-operateurs

MySQL- databasis

MySQL Skep DB MySQL Drop DB MySQL Skep tabel MySQL Drop Table MySQL Verander Tabel MySQL-beperkings MySQL nie nul nie MySQL Uniek MySQL-primêre sleutel MySQL buitelandse sleutel MySQL-tjek MySQL verstek MySQL Skep indeks MySQL Outo-verhoging MySQL-datums MySQL-aansigte

MySQL- verwysings

MySQL-datatipes MySQL-funksies
String funksies ASCII CHAR_LENGTH CHARACTER_LENGTH KONCAT CONCAT_WS VELD FIND_IN_SET FORMAAT VOEG IN INSTR LCASE LINKS LENGTE LOCATE LAER LPAD LTRIM MID POSISIE HERHAAL VERVANG OMKEER REGS RPAD RTRIM RUIMTE STRCMP SUBSTR SUBSTRING SUBSTRING_INDEX TRIM UCASE UPPER Numeric Functions ABS ACOS ASIN ATAN ATAN2 AVG CEIL CEILING COS COT COUNT DEGREES DIV EXP FLOOR GREATEST LEAST LN LOG LOG10 LOG2 MAX MIN MOD PI POW POWER RADIANS RAND ROUND SIGN SIN SQRT SUM TAN TRUNCATE Date Functions ADDDATE ADDTIME CURDATE CURRENT_DATE CURRENT_TIME CURRENT_TIMESTAMP CURTIME DATE DATEDIFF DATE_ADD DATE_FORMAT DATE_SUB DAY DAYNAME DAYOFMONTH DAYOFWEEK DAYOFYEAR EXTRACT FROM_DAYS HOUR LAST_DAY LOCALTIME LOCALTIMESTAMP MAKEDATE MAKETIME MICROSECOND MINUTE MONTH MONTHNAME NOW PERIOD_ADD PERIOD_DIFF QUARTER SECOND SEC_TO_TIME STR_TO_DATE SUBDATE SUBTIME SYSDATE TIME TIME_FORMAT TIME_TO_SEC TIMEDIFF TIMESTAMP TO_DAYS WEEK WEEKDAY WEEKOFYEAR YEAR YEARWEEK Advanced Functions BIN BINARY CASE CAST COALESCE CONNECTION_ID CONV CONVERT CURRENT_USER DATABASE IF IFNULL ISNULL LAST_INSERT_ID NULLIF SESSION_USER SYSTEM_USER USER VERSION

MySQL voorbeelde

MySQL voorbeelde MySQL Vasvra MySQL-oefeninge

MySQL Wildcards

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MySQL Wildcard karakters

'n Jokerteken word gebruik om een ​​of meer karakters in 'n string te vervang.

Jokertekens word saam met die operateur gebruik. Die operateur word in 'n klousule gebruik om na 'n gespesifiseerde patroon in 'n kolom te soek. LIKELIKE WHERE

Wildcard-karakters in MySQL

Symbol Description Example
% Represents zero or more characters bl% finds bl, black, blue, and blob
_ Represents a single character h_t finds hot, hat, and hit

Die jokertekens kan ook in kombinasies gebruik word!

Hier is 'n paar voorbeelde wat verskillende LIKEoperateurs met '%' en '_' jokertekens wys:

LIKE Operator Description
WHERE CustomerName LIKE 'a%' Finds any values that starts with "a"
WHERE CustomerName LIKE '%a' Finds any values that ends with "a"
WHERE CustomerName LIKE '%or%' Finds any values that have "or" in any position
WHERE CustomerName LIKE '_r%' Finds any values that have "r" in the second position
WHERE CustomerName LIKE 'a_%_%' Finds any values that starts with "a" and are at least 3 characters in length
WHERE ContactName LIKE 'a%o' Finds any values that starts with "a" and ends with "o"

Demo-databasis

Die tabel hieronder toon die volledige "Klante"-tabel vanaf die Northwind-voorbeelddatabasis:

CustomerIDCustomerNameContactNameAddressCityPostalCodeCountry
1Alfreds FutterkisteMaria AndersObere Str. 57Berlin12209Germany
2Ana Trujillo Emparedados y heladosAna TrujilloAvda. de la Constitución 2222México D.F.05021Mexico
3Antonio Moreno TaqueríaAntonio MorenoMataderos 2312México D.F.05023Mexico
4Around the HornThomas Hardy120 Hanover Sq.LondonWA1 1DPUK
5Berglunds snabbköpChristina BerglundBerguvsvägen 8LuleåS-958 22Sweden
6Blauer See DelikatessenHanna MoosForsterstr. 57Mannheim68306Germany
7Blondel père et filsFrédérique Citeaux24, place KléberStrasbourg67000France
8Bólido Comidas preparadasMartín SommerC/ Araquil, 67Madrid28023Spain
9Bon app'Laurence Lebihans12, rue des BouchersMarseille13008France
10Bottom-Dollar MarketseElizabeth Lincoln23 Tsawassen Blvd.TsawassenT2F 8M4Canada
11B's BeveragesVictoria AshworthFauntleroy CircusLondonEC2 5NTUK
12Cactus Comidas para llevarPatricio SimpsonCerrito 333Buenos Aires1010Argentina
13Centro comercial MoctezumaFrancisco ChangSierras de Granada 9993México D.F.05022Mexico
14Chop-suey ChineseYang WangHauptstr. 29Bern3012Switzerland
15Comércio MineiroPedro AfonsoAv. dos Lusíadas, 23São Paulo05432-043Brazil
16Consolidated HoldingsElizabeth BrownBerkeley Gardens 12 BreweryLondonWX1 6LTUK
17Drachenblut DelikatessendSven OttliebWalserweg 21Aachen52066Germany
18Du monde entierJanine Labrune67, rue des Cinquante OtagesNantes44000France
19Eastern ConnectionAnn Devon35 King GeorgeLondonWX3 6FWUK
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 08022 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 04179 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. 05033 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 01307 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. 05033 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

Gebruik die % Wildcard

Die volgende SQL-stelling kies alle kliënte met 'n stad wat met "ber" begin:

Voorbeeld

SELECT * FROM Customers
WHERE City LIKE 'ber%';

Die volgende SQL-stelling kies alle kliënte met 'n stad wat die patroon "es" bevat: 

Voorbeeld

SELECT * FROM Customers
WHERE City LIKE '%es%';

Gebruik die _ Wildcard

Die volgende SQL-stelling kies alle kliënte met 'n Stad wat met enige karakter begin, gevolg deur "ondon":

Voorbeeld

SELECT * FROM Customers
WHERE City LIKE '_ondon';

Die volgende SQL-stelling selekteer alle kliënte met 'n Stad wat met "L" begin, gevolg deur enige karakter, gevolg deur "n", gevolg deur enige karakter, gevolg deur "aan":

Voorbeeld

SELECT * FROM Customers
WHERE City LIKE 'L_n_on';

Toets jouself met oefeninge

Oefening:

Kies alle rekords waar die tweede letter van die City'a' is.

SELECT * FROM Customers
WHERE City LIKE '%';


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