inner and outer joins sql examples and the join block _ datamartist.pdf
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4/2/2015 InnerandouterjoinsSQLexamplesandtheJoinblock|Datamartist.com
http://www.datamartist.com/sqlinnerjoinleftouterjoinfullouterjoinexampleswithsyntaxforsqlserver 1/12
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EstimatingthecostofBusinessIntelligence|TableauPublicgreatvisualizationnowwheredowegetthedata?
InnerandouterjoinsSQLexamplesandtheJoinblockPostedbyJamesStandenon2/10/10CategorizedasDatamartistTool,ETL,SQLCode
InthispostI'llshowyouhowtodoallthemaintypesofJoinswithclearSQLexamples.TheexamplesarewrittenforMicrosoftSQLServer,butverysimilarsyntaxisusedinOracle,MySQLandotherdatabases.
IfyouaretiredofwritingSQLandwanttotryavisualtool,youshouldgiveDatamartistatry.ThediagramswiththeSQLexamplesareactuallyrightfromthetoolyoujusthavetopickwhatpartsoftheVenndiagramyouwant,andthedataisjoinedforyounocode.
JoinscanbesaidtobeINNERorOUTERjoins,andthetwotablesinvolvedarereferredtoasLEFTandRIGHT.Bycombiningthesetwoconceptsyougetallthevarioustypesofjoinsinjoinland:Inner,leftouter,rightouter,andthefullouterjoin.
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4/2/2015 InnerandouterjoinsSQLexamplesandtheJoinblock|Datamartist.com
http://www.datamartist.com/sqlinnerjoinleftouterjoinfullouterjoinexampleswithsyntaxforsqlserver 2/12
TablesusedforSQLExamplesInthescreenshotsI'veconfiguredDatamartisttoonlyshowthenamecolumnstosavespace.TheSQLcodeshownis
"Select*"soitwillreturnallthecolumns.YoucanseethatintheDatamartisttoolthetypeofjoinisselectedbyjustcheckingthepartsofthevenndiagramthatcontaintherowsyouwant.
1)InnerJoinSQLExampleselect*fromdbo.StudentsSINNERJOINdbo.AdvisorsAONS.Advisor_ID=A.Advisor_ID
2)LeftOuterJoinSQLExampleselect*from
dbo.StudentsS
LEFTOUTERJOIN
dbo.AdvisorsAON
S.Advisor_ID=A.Advisor_ID
4)FullOuterJoinSQLExampleselect*fromdbo.StudentsSFULLOUTERJOINdbo.AdvisorsAON
S.Advisor_ID=A.Advisor_ID
5)SQLexampleforjustgettingtherowsthatdon'tjoin
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4/2/2015 InnerandouterjoinsSQLexamplesandtheJoinblock|Datamartist.com
http://www.datamartist.com/sqlinnerjoinleftouterjoinfullouterjoinexampleswithsyntaxforsqlserver 3/12
select*
from
dbo.StudentsS
FULLOUTERJOIN
dbo.AdvisorsA
ON
S.Advisor_ID=A.Advisor_IDwhereA.Advisor_IDisnullorS.Student_IDisnull
6)SQL
exampleforjustrowsfromonetablethatdon'tjoinselect*fromdbo.StudentsSFULLOUTERJOINdbo.AdvisorsAON
S.Advisor_ID=A.Advisor_IDwhereA.Advisor_IDisnull
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4/2/2015 InnerandouterjoinsSQLexamplesandtheJoinblock|Datamartist.com
http://www.datamartist.com/sqlinnerjoinleftouterjoinfullouterjoinexampleswithsyntaxforsqlserver 4/12
Butwhataboutthe
duplicaterowthing?Now,sinceinthiscasewehadasimpleonetoonerelationship,thenumberofrowsthatwerereturnedmadethevenndiagramsmakesense,andaddupprettynormallywithtableoneandtwo.
Whathappensifthedatainthetablesarenotasimpleonetoonerelationship?WhathappensifweaddoneduplicateadvisorwiththesameID,butadifferentname?
Ajoinwillcreatearowforeverycombinationofrowsthatjointogether.Soiftherearetwoadvisorswiththesamekey,foreverystudentrecordthathasthatkey,youwillhavetworowsintheinnerpartofthejoin.Theadvisorduplicatemakesduplicatestudent
recordsforeverystudentwiththatadvisor.
Youcanseehowthiscouldadduptoalotofextrarows.Thenumberofrowsistheproductofthetwosetsofjoiningrows.Ifthetablesgetbig,justafewduplicateswillcausetheresultsofajointobemuchlargerthanthetotalnumberofrowsintheinputtablesthisissomethingyouhavetowatchverycarefullywhenjoiningcheckyourrowcounts.
Sothereyouhaveit.IfyouwanttotryjoiningtableswiththeDatamartisttoolgiveitatry.It'sasuperfastinstall,andyou'llbejoininglikeaproinnotime.
Taggedas:DatamartistTool,Joiningdata,SQL
EstimatingthecostofBusinessIntelligence|TableauPublicgreatvisualizationnowwheredowegetthedata?
-
4/2/2015 InnerandouterjoinsSQLexamplesandtheJoinblock|Datamartist.com
http://www.datamartist.com/sqlinnerjoinleftouterjoinfullouterjoinexampleswithsyntaxforsqlserver 5/12
53Comments
1. BharathiFebruary2,201211:04am
thanksalotveryniceexampleswithclaritydata
2. vikramj.September4,201210:35pm
thisistheverycleareddescriptionofjoins...thanks
3. ShaileshSeptember11,20122:34am
thanksalotveryniceexampleswithclaritydata
4. VinayakFebruary25,20139:10pm
Crystalclearexplanationswithdiagrams&ex's,reallyhelpedalot.ThankYou.
5. sam_OraMarch6,20139:32pm
Thanks...understandablearticle.
6. RezoanMarch31,201311:36pm
Veryniceandcleartutorial.
7. TonyApril6,20133:19am
Greatarticle.ThanksalotforalltheseclearexplanationsthatmadeiteasytounderstandhowtojoinmultipletablewithSQL.
8. B.K.Lee
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4/2/2015 InnerandouterjoinsSQLexamplesandtheJoinblock|Datamartist.com
http://www.datamartist.com/sqlinnerjoinleftouterjoinfullouterjoinexampleswithsyntaxforsqlserver 6/12
April17,20138:22pm
looksveryniceandcleartutorial!!!manythanksformakingmeeasierunderstandingon"Join"!!!!Keepupgreatworks..............
9. AtherApril19,20133:11am
Awesome!Thanksalot!
10. ferozkhanMay17,20138:26am
hi,
Whatagreatexample.Mydoubtsareclearedafterlongtime..!!!!!!!
Thanks
11. AjayJune18,201311:55pm
GoodExample.
12. kravenJune21,20131:09am
Greatarticle!Veryclearandconcise!
Thankyouverymuch!
13. VineethaJuly30,20136:23am
Theconcepthasbeenveryneatlyexplainedwithdiagramsandexampleswhichmakesitallthemoreeasiertounderstand.NiceJob!
Thanksalot!
14. VivekanandSinghAugust21,20135:30pm
ThisisaverygoodwaytoclaritytheJoinconcept.
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4/2/2015 InnerandouterjoinsSQLexamplesandtheJoinblock|Datamartist.com
http://www.datamartist.com/sqlinnerjoinleftouterjoinfullouterjoinexampleswithsyntaxforsqlserver 7/12
Anybodycaneasilyunderstandit.Thanksalot.
15. AdityaSeptember13,20138:26am
ThisisthebestwebsiteIhadseenthatclearlypinpointsthedifferencebetweentheJoins.ThanksaLotforyourefforttocreatethis
16. heemanshubhallaSeptember30,20136:12am
*SqlIntroduction*UsingStoredProcedures*sqlqueries*groupbyfunctionsetc*Joins
Completeexplanation
LinkhereforSqlTutorialhttp://geeksprogrammings.blogspot.in/search/label/StructuredQueryLanguage%28SQL%29
Linkhereforjoinsexplanationgeeksprogrammings.blogspot.in/2013/06/joinsinsql.html
17. rahuljatOctober4,201311:58pm
thankstoguideme...............................
18. JashvantOctober18,201310:59pm
GoodExample...Thanks
19. shirinNovember9,20134:05am
ThanksforYourHigherEducation
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4/2/2015 InnerandouterjoinsSQLexamplesandtheJoinblock|Datamartist.com
http://www.datamartist.com/sqlinnerjoinleftouterjoinfullouterjoinexampleswithsyntaxforsqlserver 8/12
20. MohamedElmanasrahNovember21,20131:19am
thanksalot
21. vijayNovember25,201310:54pm
goodexampleswhencomparetootherwebsitesKeepitup!!!!!
22. RajeshDecember10,201311:40pm
Excellentexplantionwithexampleswhichhelpedmealot..
23. MohdRiyazDecember24,20133:16am
Veryniceexampleofjoin
24. karaJanuary12,20147:26am
Missingrightouterjoinexample.point3)
25. ronFebruary11,20141:42pm
Thanks,Niceexamples
26. ThoaiNguyenFebruary12,201410:10am
Thanksyouverymuch,verynicetutorial
27. LizaFebruary26,20144:11am
ThisalsothebesttutorialonJointhatIhaveseen.Thebestexplanationistheconceptontypesofjoin,andusingthetwotables,leftandright.
Thanks
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4/2/2015 InnerandouterjoinsSQLexamplesandtheJoinblock|Datamartist.com
http://www.datamartist.com/sqlinnerjoinleftouterjoinfullouterjoinexampleswithsyntaxforsqlserver 9/12
28. YoutubeDownloaderMarch7,20146:42pm
Thispieceofwritingistrulyaniceoneithelpsnewinternetpeople,whoarewishinginfavorofblogging.
29. HikaruMarch14,20141:20am
Thisarticleisoneofthebestexamplesi'veseenonthistopic.
Thankyou!
30. AshokMistryMarch19,20149:14am
goodexplanation,
31. RutulMarch21,20148:03am
Niceexplanation
32. GeethaMarch26,20141:27am
WhatwillbetheoutputincasewetryRightOuterjoin?(righttablebeingAdvisors)
33. dboyMarch26,201410:29pm
6)SQLexampleforjustrowsfromonetablethatdon'tjoin
select*fromdbo.StudentsSFULLOUTERJOINdbo.AdvisorsAONS.Advisor_ID=A.Advisor_IDwhereA.Advisor_IDisnull
Ithinkthiswouidbeselect*fromdbo.StudentsSFULLOUTERJOINdbo.AdvisorsAONS.Advisor_ID=A.Advisor_IDwhereA.Advisor_Nameisnull
34. suniltariyalMarch28,201412:33am
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4/2/2015 InnerandouterjoinsSQLexamplesandtheJoinblock|Datamartist.com
http://www.datamartist.com/sqlinnerjoinleftouterjoinfullouterjoinexampleswithsyntaxforsqlserver 10/12
thanksforthewonderfulimplimentationofthejoin...
35. fornelasApril15,20149:28am
Niceexplanationofjoins.Wishhaddonealeftouterjoinwithawhereclause.
36. BhuvaBhaveshMay20,201411:08pm
Thankyou
37. AkramMay27,201411:30pm
ThisalsothebesttutorialonJointhatIhaveseen.THANKSALOT
38. durgeshJuly22,20147:40am
reallybestexample
39. sunitagawaliSeptember11,20141:37am
It'seasytounderstandbecausegoodexample.Thankyou...............
40. B.PeekSeptember17,20142:19pm
Greattipsandclearlyexpressed.Iputintopracticeimmediately.
41. ghanshyamSeptember27,20141:26am
well....gotcompletly......
42. saravankumarOctober25,20144:00am
verygoodExcellentexplanation......thankyou...
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4/2/2015 InnerandouterjoinsSQLexamplesandtheJoinblock|Datamartist.com
http://www.datamartist.com/sqlinnerjoinleftouterjoinfullouterjoinexampleswithsyntaxforsqlserver 11/12
43. SandyNovember14,201412:41pm
Veryeasytounderstandwithgoodexample.ThisistutorialihaveseenThanksalot..........
44. lakkakishoreNovember19,201412:08pm
IWON'TTOCODEFORJOINSINTABLEAU
45. BimalNovember20,20142:27pm
Simpleandniceexamplestomakethingsclear...thanksalotforcontribution
46. JamesStandenNovember25,20145:19pm
Heythere!IfyouloveTableau,butwanttogetyourdatareadybeforeyouloadit,I'lltellyouasecretwearejustabouttogooutinBetawithaversionofDatamartistthatcanwritedirectlytoTabeleauTDEfiles.ThismeansyoucanusetheDatamartistJoinfunctionality,whichisgraphicaljustpickthecolumnsandselectthepartsoftheVenndiagramyouwant,andthedatawilljointhenpumpthedatadirectlyintoTableau.Staytuned.
47. GerryDecember7,20144:56pm
Thanks,simple&concise,article.Helpedalot!
48. SANKARDecember9,20144:58am
HOWCANWEJOINSTWOTABLESINDBMSWITHOUTUSINGRDBMS.?SUBQUERIESANDJOINSANDSETOPERATORSALLCOMESUNDERRDBMS.................................
49. TausifSayyedFebruary5,20157:20am
excellent!!
niceexplanationmentionhere
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4/2/2015 InnerandouterjoinsSQLexamplesandtheJoinblock|Datamartist.com
http://www.datamartist.com/sqlinnerjoinleftouterjoinfullouterjoinexampleswithsyntaxforsqlserver 12/12
Thanks..
Trackbacks
1. MysqlJoinsexample|dineshshrivastava2. Howto:DifferencebetweenINNERandOUTERjoins|SevenNet3. Howto:DifferencebetweenINNERandOUTERjoins|Technicalinformationforyou4. Solution:DifferencebetweenINNERandOUTERjoins#dev#it#computers|GoodAnswer
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