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 Lessons (customer_id VARCHAR, lesson_status_code VARCHAR)
TABLE: CREATE TABLE Customers (customer_id VARCHAR, first_name VARCHAR, last_name VARCHAR)

### Question ###
How many lessons taken by customer with first name as Rylan and last name as Goodwin were completed?

### Accurate SQL ###

SELECT COUNT(*) FROM Lessons AS T1 JOIN Customers AS T2 ON T1.customer_id = T2.customer_id WHERE T2.first_name = "Rylan" AND T2.last_name = "Goodwin" AND T1.lesson_status_code = "Completed"