HAYASHI Kentaro
null+****@clear*****
Tue Dec 17 18:33:45 JST 2013
HAYASHI Kentaro 2013-12-17 18:33:45 +0900 (Tue, 17 Dec 2013) New Revision: 50f99c7800e060e1d00d00a33905cfad56399c46 https://github.com/groonga/groonga/commit/50f99c7800e060e1d00d00a33905cfad56399c46 Message: doc: refine introduction part of drilldown Modified files: doc/source/tutorial/drilldown.txt Modified: doc/source/tutorial/drilldown.txt (+11 -5) =================================================================== --- doc/source/tutorial/drilldown.txt 2013-12-17 15:35:41 +0900 (d6678a3) +++ doc/source/tutorial/drilldown.txt 2013-12-17 18:33:45 +0900 (9342f07) @@ -10,12 +10,18 @@ Drilldown ========= -There is a case that you want to know summary of search result. -For example, it is the case that searching the number of records which belongs to specific category. -Selecting a category at first, then investigate further in detail is a reasonable way. +You learned how to filter search results and sort ones in the previous sections. +Now that you can search as you likes, but how do you summarize the number of records which has specific value in the column? -To achive such a purpose, Groonga provides the feature which groups search results by the value of specific column. -In Groonga, this feature is called ``drilldown``. +As you know, there is a naive solution to execute query by every the value of column, then you can get the number of records as a result. It is a simple way, but it is not reasonable to many records. + +If you are familiar with SQL, you will doubt with "Is there a similar SQL functionality to ``GROUP BY`` in Groonga?". + +Of course, Groonga provides such a functionality. It's called as ``drilldown``. + +``drilldown`` enables you to get the number of records which belongs to specific the value of column at once. + +To illustrate this feature, imagine the case that classification by domain and grouping by country that domain belongs to. Here is the concrete examples how to use this feature. -------------- next part -------------- HTML����������������������������...Download
