CREATE TABLE table_31969 ("Heat Rank" FLOAT, "Lane" FLOAT, "Swimmer" CLOB, "Country" CLOB, "Time" FLOAT, "Overall Rank" CLOB)

In heat rank 7, what is the sum of lanes?
SELECT SUM("Lane") FROM table_31969 WHERE "Heat Rank" = '7'
SELECT SUM("Lane") FROM "table_31969" WHERE "Heat Rank" = '7'