> For the complete documentation index, see [llms.txt](https://solr-express.gitbook.io/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://solr-express.gitbook.io/docs/5.1.2/tutorials/basic-features/queries.md).

# 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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