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_68 (population INTEGER, simplified VARCHAR, area VARCHAR)

### Question ###
What's the sum of the population for the place simplified 上杭县 with an area smaller than 2,879?

### Accurate SQL ###

SELECT SUM(population) FROM table_name_68 WHERE simplified = "上杭县" AND area < 2 OFFSET 879