Table: us_depression_data
Columns: table_2_depression_data
1929
1931
1933
1937
1938
1940

Question: What is the sum of 1938 values where 1933 values are under 68.3 and 1940 valures are under 4.02?
SQL: SELECT SUM("1938") FROM us_depression_data WHERE "1933" < 68.3 AND "1940" < 4.02

Question: What is the average 1940 value where 1929 values are 101.4 and 1933 values are over 68.3?
SQL: SELECT AVG("1940") FROM us_depression_data WHERE "1929" = 101.4 AND "1933" > 68.3

Question: What is the highest 1937 value that has a 1940 value over 126?
SQL: SELECT MAX("1937") FROM us_depression_data WHERE "1940" > 126