ผลรวมสำหรับปี 1990 ที่มี 0 ในปี 1900 เป็นเท่าใด ไม่จำเป็นต้องใช้ตารางทั้งหมด
What was the sum for the 1990s, that has 0 in the 1900s?It is not neccessary to use all the tables.
 table_7585:  "1900s" [ real]  "1920s" [ real]  "1930s" [ real]  "1940s" [ real]  "1950s" [ real]  "1960s" [ real]  "1970s" [ real]  "1980s" [ real]  "1990s" [ real] 
SELECT SUM("1990s") FROM table_7585 WHERE "1900s" < '0'