Transact-SQL(T-SQL)isMicrosoft'sproprietaryextensiontotheSQLlanguagethatisusedwithMicrosoftSQLServerandAzureSQLDatabase.ThisbookwillbeausefulguidetolearningtheartofwritingefficientT-SQLcodeinmodernSQLServerversions,aswellastheAzureSQLDatabase.Thebookwillgetyoustartedwithqueryprocessingfundamentalstohelpyouwritepowerful,performantT-SQLqueries.Youwillthenfocusonqueryexecutionplansandlearnhowtoleveragethemfortroubleshooting.Inthelaterchapters,youwilllearnhowtoidentifyvariousT-SQLpatternsandanti-patterns.Thiswillhelpyouanalyzeexecutionplanstogaininsightsintocurrentperformance,anddeterminewhetherornotaqueryisscalable.Youwillalsolearntobuilddiagnosticqueriesusingdynamicmanagementviews(DMVs)anddynamicmanagementfunctions(DMFs)toaddressvariouschallengesinT-SQLexecution.Next,youwillstudyhowtoleveragethebuilt-intoolsofSQLServertoshortenthetimetakentoaddressqueryperformanceandscalabilityissues.Intheconcludingchapters,thebookwillguideyouthroughimplementingvariousfeatures,suchasExtendedEvents,QueryStore,andQueryTuningAssistantusinghands-onexamples.Bytheendofthisbook,youwillhavetheskillstodeterminequeryperformancebottlenecks,avoidpitfalls,anddiscovertheanti-patternsinuse.ForewordbyConorCunningham,PartnerArchitect–SQLServerandAzureSQL–Microsoft