How to retrieve data from an XML file in SQL Server and perform conditional operations on the retrieved data?

To retrieve data from an XML file in SQL Server and perform conditional operations on the retrieved data, you can use the built-in XML features in SQL Server. Here is a sample code snippet in T-SQL that demonstrates how to achieve this:

```sql
DECLARE @xmlData XML
SET @xmlData = '

John
30

Jane
25

'

SELECT
Data.value('(Name)[1]', 'VARCHAR(50)') AS Name,
Data.value('(Age)[1]', 'INT') AS Age
FROM @xmlData.nodes('/Root/Data') AS T(Data)
WHERE Data.value('(Age)[1]', 'INT') > 25
```

In this code snippet:
1. The XML data is stored in a variable `@xmlData`.
2. The `nodes()` method is used to shred the XML data and retrieve the individual `` elements.
3. The `value()` method is used to extract the values of the `` and `` elements for each `` element.
4. A `WHERE` clause is used to perform a conditional operation (age > 25 in this example) on the retrieved data.

By using these XML functions in SQL Server, you can easily retrieve data from an XML file and perform conditional operations on the data as needed. This approach is efficient and effective for working with XML data within the SQL Server environment.