Table: dept_loco_history
Columns: number
previous_number_s
previous_class
converted
withdrawn
disposal

Question: How much Converted has a Number of 35, and a Withdrawn smaller than 1952?
SQL: SELECT COUNT("converted") FROM dept_loco_history WHERE "number" = '35' AND "withdrawn" < 1952

Question: How much Withdrawn has a Number of 42, and a Previous Number(s) larger than 68178?
SQL: SELECT SUM("withdrawn") FROM dept_loco_history WHERE "number" = '42' AND "previous_number_s" > 68178

Question: Which Withdrawn has a Previous Class of j69, and a Previous Number(s) smaller than 68532, and a Converted larger than 1959?
SQL: SELECT MAX("withdrawn") FROM dept_loco_history WHERE "previous_class" = 'j69' AND "previous_number_s" < 68532 AND "converted" > 1959