# Queries

## Queries

### Feature

Create a query to filter or to use in filter query

### How to

1. Use some feature that allow use **SearchQuery<>** (i.e. *Filter* or *FacetQuery*)
2. Configure query

```csharp
    DocumentCollection<TechProductDocument> documentCollection; // from DI

    var rersult = documentCollection
        .Select()
         // cat:"some category"
        .Filter(q => q.Categories, query => query.EqualsTo("some category"))
        .Execute();
```

1. Optionally use a chain of methods

```csharp
    DocumentCollection<TechProductDocument> documentCollection; // from DI

    var rersult = documentCollection
        .Select()
         // cat:"some category" OR features:("feature1" OR "feature2")
        .Filter(q => q.Categories, query => query
            .EqualsTo("some category")
            .Or(nested => nested
                .Field(f => f.Features)
                .Any("feature1", "feature2")))
        .Execute();
```

### Simple cases

| Use case                                               | How to                                                       | Query generated                   |
| ------------------------------------------------------ | ------------------------------------------------------------ | --------------------------------- |
| Query to find all informed values (conditional AND)    | query.Field(f => f.Categories).All("category1", "category2") | cat:("category1" AND "category2") |
| Query to find some of informed values (conditional OR) | query.Field(f => f.Categories).Any("category1", "category2") | cat:("category1" OR "category2")  |
| Query to find something starts with informed value     | query.Field(f => f.Categories).StartsWith("c")               | cat:"c\*"                         |
| Query to find exact informed value                     | query.Field(f => f.Categories).EqualsTo("category1")         | cat:"category1"                   |
| Query to find negate informed value                    | query.Field(f => f.Categories).NotEqualsTo("category1")      | NOT(cat:"category1")              |
| Query to find someting in informed range               | query.Field(f => f.Price).InRange(1, 10)                     | price:\[1 TO 10]                  |
| Query to find someting greater than informed value     | query.Field(f => f.Price).GreaterThan(1)                     | price:\[1 TO \*]                  |
| Query to find someting less than informed value        | query.Field(f => f.Price).LessThan(1)                        | price:\[\* TO 10]                 |

## Complex queries

| Use case                              | How to                                                                                                                             | Query generated                              |
| ------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------- |
| Query expression isolating in a group | query.Group(price=> price.Filed(f => f.Price).InRange(1, 10).Or(popularity => popularity.Field(f => f.Popularity).GreaterThan(5))) | (price:\[1 TO 10] OR  popularity:\[5 TO \*]) |


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# Agent Instructions: Querying This Documentation

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Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://solr-express.gitbook.io/docs/5.3.0/tutorials/basic-features/queries.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.