Table: diamondbacks_2008
Columns: date
opponent
score
loss
attendance
record

Question: What loss has 16-6 as the record?
SQL: SELECT "loss" FROM diamondbacks_2008 WHERE "record" = '16-6'

Question: What loss has 4-2 as the record?
SQL: SELECT "loss" FROM diamondbacks_2008 WHERE "record" = '4-2'

Question: What attendance has astros as the opponent, and april 29 as the date?
SQL: SELECT SUM("attendance") FROM diamondbacks_2008 WHERE "opponent" = 'astros' AND "date" = 'april 29'