Database: FileTable

FileTable is a feature introduced in SQL Server 2012 that brings the benefits of structured query language (SQL) and relational databases to file storage. It allows you to store files and documents in a table in SQL Server, providing a seamless integration between the database engine and the file system.

How FileTable Works

FileTable works by creating a special table in the database that maps to a folder in the file system. This allows you to manage files and documents using the familiar SQL syntax, making it easier to work with both structured data and unstructured data.

Creating a FileTable

```sql CREATE TABLE MyFileTable AS FileTable WITH (FileTable_Directory = 'FileTableData'); ```

In this example, we are creating a FileTable called MyFileTable that maps to the folder 'FileTableData' in the file system. This folder will be used to store all the files and documents associated with the FileTable.

Inserting Files into a FileTable

```sql INSERT INTO MyFileTable (name, file_stream) VALUES ('Document1.txt', 0x546869732069732061207465737420646f63756d656e74); ```

In this example, we are inserting a file called 'Document1.txt' into the FileTable. The file contents are represented as a hexadecimal value in the file_stream column.

Querying Files from a FileTable

```sql SELECT name, file_stream.PathName() AS FilePath FROM MyFileTable WHERE name = 'Document1.txt'; ```

This query retrieves the file name and path for 'Document1.txt' from the FileTable. The file_stream.PathName() function is used to get the file path in the file system.

Common Use Cases

FileTable can be used in various scenarios such as document management systems, content repositories, and file sharing applications. It provides a centralized location for storing and managing files, making it easier to access and manipulate them using SQL queries.

Importance in Interviews

Understanding FileTable is crucial for database administrators and developers who work with SQL Server. It demonstrates your knowledge of advanced database features and your ability to integrate structured and unstructured data efficiently.

Conclusion

FileTable is a powerful feature in SQL Server that simplifies file management and integration with relational databases. By leveraging FileTable, you can streamline file storage and retrieval processes, making it easier to work with both structured and unstructured data in your applications.

Tags:

Database, SQL Server, FileTable, File Management