• Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other Pie Elite all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Jeanne Boyarsky
  • Ron McLeod
  • Paul Clapham
  • Liutauras Vilda
Sheriffs:
  • paul wheaton
  • Rob Spoor
  • Devaka Cooray
Saloon Keepers:
  • Stephan van Hulst
  • Tim Holloway
  • Carey Brown
  • Frits Walraven
  • Tim Moores
Bartenders:
  • Mikalai Zaikin

inner join Vs outer join

 
Ranch Hand
Posts: 1491
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
What is the difference between inner join and outer join ?
 
Ranch Hand
Posts: 403
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
- inner joins only returns rows that "match" in both tables
- outer joins return "all" rows from 1st table, and null valued columns in rows that don't exist in the 2nd table

for example, imagine we have this data, also for each query, we join them on column "id":


Also to note, the SQL syntax for outer joins is database vendor specific, Oracle used different notation from say SQL Server.
 
kri shan
Ranch Hand
Posts: 1491
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
In Oracle outer join is defined as * symbol. in Sybase outer join is defined as + symbol. What is the outer join symbol for DB2 ?
 
author & internet detective
Posts: 41933
910
Eclipse IDE VI Editor Java
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Kri,

 
Consider Paul's rocket mass heater.
reply
    Bookmark Topic Watch Topic
  • New Topic