I think I need help understanding the use case. Like others, I'm quite happily using a PostgreSQL server, when I need to query a DB using SQL. This clearly do

I think I need help understanding the use case. Like others, I'm quite happily using a PostgreSQL server, when I need to query a DB using SQL. This clearly doesn't work in the embedded case, but why would I need SQL there? Why wouldn't be an embedded key/value DB like Berkeley DB (which also offers ACID, transactions and write-ahead-logging) be sufficient there? I for one am quite surprised to learn that a web browser would have a SQL DB built-in.