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_13 ( year_opened INTEGER, span_feet VARCHAR, span_metres VARCHAR )

### Question ###
What is the sum of Year opened when the span feet is more than 1247, and the spam metres is 384?

### Accurate SQL ###

SELECT SUM(year_opened) FROM table_name_13 WHERE span_feet > 1247 AND span_metres = 384