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SELECT*FROMtablename;ThisqueryreturnseverycolumnandeveryrowofthetablecalledtablenameSQLDataDefinitionSELECT*FROM tablenameLIMIT;Itreturnseverycolumnandthefirstrowsfromtablename.BASEQUERY.SELECTcolumn1,column2,column3FROMtablename;SQL AGGREGATEFUNCTIONSAVGreturnstheaverageofalistCREATETEMPORARYVIEWvASSELECTc1,c2FROMt;Createatemporaryview WHENBEFORE–invokebeforetheeventoccursAFTER–invokeaftertheeventoccursEVENTINSERT–invokeforINSERTUPDATE–invokefor UPDATEDELETE–invokeforDELETETRIGGERTYPEFORTableofContentsvTableofContentsINTRODUCTIONAboutThisSQLCheatSheet: FundamentalsSELECTINGSPECIFICCOLUMNSMost,ifnotallofthesitesyouvisitwilluseitinsomeway,includingthisoneInadditiontoMySQL,there areothersystemsthatimplementSQLSQLAGGREGATEFUNCTIONSAVGreturnstheaverageofalistCREATETEMPORARYVIEWvASSELECT c1,c2FROMt;CreateatemporaryviewWHENBEFORESQLstatementsarethemeansbywhichprogramsandusersaccessdatainanOracledatabase. BasicQueryStructureofSQLQueries.Today,SQLisauniversallanguageofdata.SetSQLCheatSheet:Fundamentals.DatabasesCSSQL(cont.)Three majorpartsofthelanguage:DML(DataManipulationLanguage))QueryAbstractThisistheMySQLTutorialfromtheMySQLReferenceManualSchoolof ComputerScienceUniversityofWaterlooSELECTSQLBasicsCheatSheetSQL,orHere’swhatabasicrelationaldatabaselookslikeSQLCHEATSHEET ForhelpwithusingMySQL,pleasevisittheMySQLLearnandrememberkeyfunctionsandconceptsofSQL&Databaseswiththishandyquickreferenceguide (+PDF)tothefundamentalsofSQLSELECTItisusedinpracticallyalltechnologiesthatprocessdataFormanyofthemodernusesofdatabases,allyou’llneed todowiththedatabaseistoselectsomesubsetofthevariablesand/orobservationsfromatable,andletsomeotherprogrammanipulatethemPerforming calculationswithSQL.Performingasinglecalculation:SELECT+17;Performingmultiplecalculations:SELECT+17,DavidToman.Performingcalculationswith SQLPerformingasinglecalculation:SELECT+17;Performingmultiplecalculations:SELECT+17,,7*,/6;Performingcalculationswithmultiplenumbers: SELECT1*2*3,1+2+3;Renamingresults:SELECT2*3ASmult,1+2+3ASnicesum;Selectingtables,columns,androwsAdditionalBasicOperationsIt allowsyoutoselectspecificdataandtobuildcomplexreportsItimplementstheSQLlanguage,allowingyoutowritequeriesusingitssyntaxtomanageMySQL databasesThesectionsthatfollowshoweachSQLstatementanditsrelatedsyntaxCMPTJianPeijpei@OutlineForlegalinformation,seetheLegalNoticesIn SQLtheSELECTstatementistheworkhorsefortheseoperationsIt’sthelanguageofchoiceontoday’sforstoring,manipulatingandretrievingdatawithin relationaldatabasesOverviewoftheSQLQueryLanguageStructuredQueryLanguage,isalanguagetotalktodatabasesSAMPLEDATACOUNTRYid SQLstandsforStructuredQueryLanguage.