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_name_39 ( blank_ends INTEGER, nation VARCHAR, ends_lost VARCHAR )

### Question ###
What is the sum of Blank Ends for Denmark when less than 42 is the ends lost?

### Accurate SQL ###

SELECT SUM(blank_ends) FROM table_name_39 WHERE nation = "denmark" AND ends_lost < 42