Is there any way I can user a NOT or other negation operator before a text search keyword for example,
NOT program
When I do such a search there are 0 records returned.
Please let me know some way to achieve this option.
In Solr you can use the '-' minus sign as a NOT operator, so you would change your query to be
*:* - program
If you are using SolrNet, since that is how your question is tagged, you can do the following
solr.Query(new SolrQuery("*:*") && !new SolrQuery("program"));
Please see Querying in SolrNet for more details.
Updated: Per comment from Mauricio Scheffer
There aren't any search operators that perform the search parameters you are describing. My advice is to use the Google advanced search features. You can make your search much more specific in a number of ways, its really advanced.
Related
All:
Right now, I want to input a search in SOLR like this:
+keyword1 OR +keyword2
+keyword1 OR keyword2
Could anyone explain how SOLR process this logic?
I am not sure if this above eaquals
keyword1 AND keyword2
keyword1
Thanks
I would not recommend mixing the prefix (+,-) syntax with the boolean (AND, OR) syntax. "+" corresponds to Occur.MUST. A term without a prefix corresponds to Occur.SHOULD, which means it gets a scoring boost, but documents lacking that term may be in the results.
I recommend reading this article:
https://lucidworks.com/post/why-not-and-or-and-not/
I'm working on a solr query similar to the following:
((Author_Type:"Corporate" AND (Social_Media_Type_Source:"Retweet" OR Social_Media_Type_Source:"Comment")) OR NOT Author_Type:Corporate)
When running this, no results are returned. I am looking for is to pull the record,only if author_type matches Corporate and then Social_media_type_source is (retweet OR comment) or if author_type is not Corporate include it in the results.
I have seen similar example which is poster here but its seems not working on me.I am using solr4.10.1
Thanks for the help
Hopefully this isn't obsolete in Solr 4.x, but your problem may be in thinking that NOT can be a unary operator.
From the Lucene/Solr 3.5 docs:
Note: The NOT operator cannot be used with just one term. For example,
the following search will return no results:
NOT "jakarta apache"
You might be able to express the same thing by taking advantage of the fact that *:* will return all documents. Thus something like this might work:
(Author_Type:"Corporate" AND (Social_Media_Type_Source:"Retweet" OR
Social_Media_Type_Source:"Comment")) OR (*:* NOT
Author_Type:Corporate)
I wish to query a Lucene index and ask the question "..does the string ABC occur in Field A AND string DEF in Field B ..."
BOTH conditions (ABC in Field A and DEF in Field B) must be true ....I've fooled around
with a few searches and don't seem to be hit the proper combination.
Any ideas / examples ...seems that the MultiFieldQueryParser may be the answer but I've had no luck so far.
The standard query parser supports this sort of query, like:
+fielda:ABC +fieldb:DEF
The + character is the required operator, so this query will require a match on both fielda:ABC and fieldb:XYZ.
See the query parser syntax documentation, for more information.
MultiFieldQueryParser is used to automatically search for the same content in multiple fields, so not quite what you are looking for.
Turns out on a SOLR browser search, the q.OP=AND on the URL will provide the ANDING condition I was looking for.
In my solr use case I don't have any stopwords. I found that AND is considered as a query operator though. I placed + in front of AND and now it is not considered as a word any more. Is that the right way of solving this or is there more preferred way?
Plz use double quotes to wrap it.
Example:
q=field:"AND"
Check that your pipeline is not discarding AND as a stop-word. In Solr 4+, you can do it in the WebUI's Analysis section. It will show what happens with your text as it goes through the analyzers.
Is there a way to specify a set of terms that are more important when performing a search?
For example, in the following question:
"This morning my printer ran out of paper"
Terms such as "printer" or "paper" are far more important than the rest, and I don't know if there is a way to list these terms to indicate that, in the global knowledge, they'd have more weight than the rest of words.
For specific documents you can use QueryElevationComponent, which uses special XML file in which you place your specific terms for which you want specific doc ids.
Not exactly what you need, I know.
And regarding your comment about users not caring what's underneath, you control the final query. Or, in the worst case, you can modify it after you receive it at Solr server side.
Similar: Lucene term boosting with sunspot-rails
When you build the query you can define what are the values and how much these fields have weight on the search.
This can be done in many ways:
Setting the boost
The boost can be set by using "^ "
Using plus operator
If you define + operator in your query, if there is a exact result for that filed value it is shown in the result.
For a better understanding of solr, it is best to get familiar with lucene query syntax. Refer to this link to get more info.