How do I check the db type about Metabase?

Hello, I'm new here with Metabase...
I dont know which database type is my Metabase? Many functions cannot be used...I broke down

I want to get the number in Json_str,e.g: "{'p':0,...}"
But I can use regexextract in there

Hi @JayceS
Metabase doesn't use a database type - it sends the queries to the data sources configured in Admin > Databases.
The error indicates that you're using the ClickHouse driver, so either the database does not support the functions or the driver has not implemented them.