如何从Amazon CloudSearch中的表字段获取不同的记录

Question

嗨，我是Amazon CloudSearch的新手。在mysql中，我们使用Distinct关键字获取唯一记录。如何在Amazon CloudSearch中使用此功能..请帮助我

Answer 1

Cloudsearch doesn't have the ability to do a "DISTINCT" query in the same way that a SQL database would, ie return the values of some specified fields with no duplicates.

Cloudsearch always returns at least the IDs of all of the documents that match your search criteria.

If you are looking for a specific document, and you have its document ID, you can retrieve it like:

.../2011-02-01/search?bq=docid:'mydocid'

Otherwise, you'll need to have a field in the document that is unique, enforced by your application, that you can search by.