Subword completion for SQL

### Description

Provide subword completion for SQL

### Use case/motivation

I think it would be a good idea to provide subword completion for SQL too. In the GIF you can see why it might be useful.

![SQL-Completion](https://github.com/user-attachments/assets/f2dda610-78d8-43d9-9030-bf165c30d167)

### Related issues

_No response_

### Are you willing to submit a pull request?

No