Table: futsal_championship_2008_2
Columns: match_no
date
time
score
venue
match_report

Question: What is the highest Match No., when Date is 2008-03-21, and when Time is 16:00?
SQL: SELECT MAX("match_no") FROM futsal_championship_2008_2 WHERE "date" = '2008-03-21' AND "time" = '16:00'