You can sort the query results in Apache Solr by using the “sort” parameter. Here’s a brief overview of how to use the “sort” parameter:
1. The “sort” parameter: The “sort” parameter is used to specify the sorting order of the search results. You can sort by one or more fields, and specify the direction of the sort (ascending or descending).
2. Example: To sort search results by the “price” field in descending order, you would use the following URL:
http://localhost:8983/solr/yourcore/select?q=*:*&sort=price desc
This URL specifies that the search query should return all documents (“*:*”) and sort the results by the “price” field in descending order (“sort=price desc”).
3. Multiple sort criteria: You can also sort the search results by multiple fields. To do this, you can separate each sorting criterion with a comma. For example, to sort search results by the “price” field in descending order and the “title” field in ascending order, you would use the following URL:
http://localhost:8983/solr/yourcore/select?q=*:*&sort=price desc, title asc
This URL specifies that the search query should return all documents (“*:*”) and sort the results by the “price” field in descending order and the “title” field in ascending order.
4. Function queries: In addition to sorting by field values, you can also sort the search results based on a function query. Function queries use mathematical expressions to calculate relevance scores for each document based on the values of the fields in the document. For example, to sort search results by the sum of the “price” and “popularity” fields, you would use the following URL:
http://localhost:8983/solr/yourcore/select?q=*:*&sort=sum(price,popularity) desc
This URL specifies that the search query should return all documents (“*:*”) and sort the results by the sum of the “price” and “popularity” fields in descending order.
By using the “sort” parameter, you can customize the sorting order of the search results returned by Solr to suit your needs. The Solr documentation provides detailed information on how to use the “sort” parameter and other query parameters to fine-tune your search queries.