Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE Ref_Detention_Type ( detention_type_description VARCHAR, detention_type_code VARCHAR )
TABLE: CREATE TABLE Detention ( detention_type_code VARCHAR )

### Question ###
What are the code and description of the least frequent detention type ?

### Accurate SQL ###

SELECT T1.detention_type_code, T2.detention_type_description FROM Detention AS T1 JOIN Ref_Detention_Type AS T2 ON T1.detention_type_code = T2.detention_type_code GROUP BY T1.detention_type_code ORDER BY COUNT(*) LIMIT 1