Hi is there any feature that I can augment existing Knowledge graphs in our company database to LLM using llama-index?

What's the main difference between llama-index and langchain?

What is the correspondent module of Agents (defined in Langchain) in llama-index?

Does llama-index also has js/ts version of it like langchain?

Hi all, I've recently experimented with the SQLDatabase and NLSQLTableQueryEngine features from llama-index and found them to be impressively effective. These features appear to convert natural-language queries into SQL statements, but I'm uncertain about the underlying processes that make this possible. Could you guide me towards resources where I might better understand how this functionality is implemented?