Table: nationals_2006_season
Columns: date
opponent
score
loss
attendance
record

Question: Which Record has an Opponent of pittsburgh pirates, and a Date of may 5?
SQL: SELECT "record" FROM nationals_2006_season WHERE "opponent" = 'pittsburgh pirates' AND "date" = 'may 5'

Question: Which Attendance has an Opponent of pittsburgh pirates, and a Date of may 5?
SQL: SELECT AVG("attendance") FROM nationals_2006_season WHERE "opponent" = 'pittsburgh pirates' AND "date" = 'may 5'

Question: Which Attendance is the highest one that has a Record of 15-28?
SQL: SELECT MAX("attendance") FROM nationals_2006_season WHERE "record" = '15-28'