Sum (query directive)
From WandoraWiki
(Difference between revisions)
| Line 11: | Line 11: | ||
Following example sums the number of instances of each instances. | Following example sums the number of instances of each instances. | ||
| − | importPackage(org.wandora.query2); | + | importPackage(org.wandora.query2); |
| − | new Sum( | + | new Sum( |
| − | + | new Count(new Instances()) | |
| − | + | .from(new Instances()) | |
| − | ) | + | ) |
Note that you can do the same thing easier without the ''Sum''. | Note that you can do the same thing easier without the ''Sum''. | ||
| − | importPackage(org.wandora.query2); | + | importPackage(org.wandora.query2); |
| − | new Count(new Instances().from(new Instances())) | + | new Count(new Instances().from(new Instances())) |
[[Category:Query directive]] | [[Category:Query directive]] | ||
Latest revision as of 13:11, 25 August 2009
[edit] Description
Returns the sum of values of active column.
[edit] Constructor
Sum(Directive directive)
[edit] Examples
Following example sums the number of instances of each instances.
importPackage(org.wandora.query2); new Sum( new Count(new Instances()) .from(new Instances()) )
Note that you can do the same thing easier without the Sum.
importPackage(org.wandora.query2); new Count(new Instances().from(new Instances()))
