Range queries are an important feature in Apache Solr that allow you to search for documents that contain field values within a specified range of values. Here’s a brief overview of how to use range queries in Solr:
1. The “[]” and “{}” characters: Range queries in Solr use the “[]” and “{}” characters to specify the boundaries of the range. The “[]” characters are used to include the boundary values in the range, while the “{}” characters are used to exclude the boundary values from the range. For example, to search for documents where the “price” field is between 10 and 50 (inclusive), you would use the following URL:
http://localhost:8983/solr/yourcore/select?q=*:*&fq=price:[10 TO 50]
This URL specifies that the search query should return all documents (“*:*”) and filter the results to only show documents where the “price” field is between 10 and 50 (inclusive) (“fq=price:[10 TO 50]”).
2. Exclusive ranges: To search for documents where the field value is within an exclusive range (i.e., the boundary values are not included), you would use the “{}” characters. For example, to search for documents where the “price” field is between 10 and 50 (exclusive), you would use the following URL:
http://localhost:8983/solr/yourcore/select?q=*:*&fq=price:{10 TO 50}
This URL specifies that the search query should return all documents (“*:*”) and filter the results to only show documents where the “price” field is between 10 and 50 (exclusive) (“fq=price:{10 TO 50}”).
3. Inclusive/exclusive ranges: To search for documents where the field value is within a range that includes one boundary value but excludes the other, you would use a combination of “[]” and “{}” characters. For example, to search for documents where the “price” field is greater than or equal to 10 but less than 50, you would use the following URL:
http://localhost:8983/solr/yourcore/select?q=*:*&fq=price:[10 TO 50}
This URL specifies that the search query should return all documents (“*:*”) and filter the results to only show documents where the “price” field is greater than or equal to 10 but less than 50 (“fq=price:[10 TO 50}”).
By using range queries in Solr, you can easily search for documents that contain field values within a specified range of values, making it easier for users to find the information they are looking for. The Solr documentation provides detailed information on how to use range queries and other query parameters to fine-tune your search queries.