# DataFrameQueryUtil

`DataFrameQueryUtil` provides utility methods for executing database queries on DataFrame objects.

### Methods

#### `queryValue(query: String)`

**Description:** Executes a SQL query on a DataFrame object..

**Parameters:**

* `query` (type: String): The SQL query to execute.

**Returns:** A string containing the result of the query in the first row and first column.

**Example: Get the email address of a user based on their username.**

**Use Case**: Useful for retrieving user contact information from a dataframe

{% code fullWidth="false" %}

```typescript
var userEmail = DataFrameQueryUtil.queryValue("SELECT email from VisualQuery_1 where username like 'Samuel'")
```

{% endcode %}

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