UnregisterExternalEvaluator   

unregisters the external evaluator referenced by evaluator for system sys so that it is not used by ExternalEvaluate and related functions.

Details

UnregisterExternalEvaluator[sys,evaluator] effectively blocks the external evaluator referenced by evaluator from being used by ExternalEvaluate.
evaluator is typically an executable file that can be used to execute code for the system sys, but can also be specified as File[…] or DatabaseReference[…].
In UnregisterExternalEvaluator[sys,…], possible choices of sys include:

	"Python"	Python
	"NodeJS"	JavaScript running through Node.js
	"Julia"	Julia
	"Ruby"	Ruby
	"R"	R
	"Shell"	Bash, Sh, Zsh, ...
	"Jupyter"	Jupyter kernel
	"SQL"	SQL database
	"SQL-JDBC"	SQL database using JDBC

Define a reference to a database using SQLite:

When using ExternalEvaluate, "SQL" will use the most recently registered database:

Unregister the database:

After unregister the database ExternalEvaluate will fallback to the default database which is empty:

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