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 table_19930660_2 (winner VARCHAR, rufus_guest VARCHAR)

### Question ###
Who won the episode in which Sean Lock was Rufus's guest?

### Accurate SQL ###

SELECT winner FROM table_19930660_2 WHERE rufus_guest = "Sean Lock"