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 All_documents (document_type_code VARCHAR)

### Question ###
Show the number of documents with document type code CV or BK.

### Accurate SQL ###

SELECT COUNT(*) FROM All_documents WHERE document_type_code = "CV" OR document_type_code = "BK"