• 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

sql-statement in tuple

 
Ranch Hand
Posts: 580
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Which sql-statement should I prefer?



or this:



Is the one faster than the other?
 
Bartender
Posts: 10336
Hibernate Eclipse IDE Java
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Is the first one valid SQL?
 
nimo frey
Ranch Hand
Posts: 580
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
I guess yes, I use DB2 and the first one also works.
 
Paul Sturrock
Bartender
Posts: 10336
Hibernate Eclipse IDE Java
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
It must be DB2 syntax then, its not part of the ANSI standard, and a quick test shows Oracle, MySQL and SQL Server don't support it. This would be reason enough for me to decide not to use it. I'm afraid I can't help with your performance question, DB2 is a bit of a mystery to me. What does the documentation say?
 
Ranch Hand
Posts: 182
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Most rdbms has a explain execution plan utility for system and sql optimization. I have no familiarity with DB2 but a little google search (DB2 explain plan) leads to this : http://etutorials.org/SQL/Sql+tuning/Chapter+3.+Viewing+and+Interpreting+Execution+Plans/3.2+Reading+DB2+Execution+Plans/

You can use these tools to verify and see what database does for your query.

Regards,

Fatih.
 
nimo frey
Ranch Hand
Posts: 580
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
okay thanks, I use the non-tuple version.
 
Don't get me started about those stupid light bulbs.
reply
    Bookmark Topic Watch Topic
  • New Topic