I have two tables called 'data' and 'year'. The table 'data' has two columns namely 'year' and 'value'. And table 'year' contains only one column 'year'. Table 'year' contains six rows always - they are current year, current year + 1, ... current year + 5. For example, if the current year is 2002, the table 'year' will have six rows as: 2002 2003 2004 2005 2006 2007 Table 'data' may or may not have all these years. In case one of these...
years is missing, I would like to see a row with a value 0 for that row. So I wrote a outer join query as follows:
SELECT nvl(sum(value),0) value, YEAR.year year FROM DATA,YEAR WHERE DATA.year(+)= YEAR.year GROUP BY YEAR.yearI want to know, if there is any other way by which I can write a query to produce the same result, but can avoid using 'year' table. Since I will always know the six years for which I want data from 'data' table. If one of them is missing, I want that year with a value 0 in the result.
You can write the query like this:
SELECT nvl(sum(data.value),0) value, Y.year year FROM DATA ,(select 2002 as year from dual union all select 2003 as year from dual union all select 2004 as year from dual union all select 2005 as year from dual union all select 2006 as year from dual union all select 2007 as year from dual) y WHERE DATA.year(+)= Y.year GROUP BY Y.year ;Usage of year table is eliminated if you know all values you can use a derived table that "builds" the in-line result set online and use it in the query.
For More Information
- What do you think about this answer? E-mail the editors at editor@searchDatabase.com with your feedback.
- The Best Oracle Web Links: tips, tutorials, scripts, and more.
- Have an Oracle or SQL tip to offer your fellow DBAs and developers? The best tips submitted will receive a cool prize. Submit your tip today!
- Ask your technical Oracle and SQL questions -- or help out your peers by answering them -- in our live discussion forums.
- Ask the Experts yourself: Our SQL, database design, Oracle, SQL Server, DB2, metadata, object-oriented and data warehousing gurus are waiting to answer your toughest questions.
Dig deeper on Oracle and SQL
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.