Table: boxing_quads_2
Columns: number
name
titles
date
opponent
result

Question: What is the highest number of the match with julio césar vásquez as the opponent?
SQL: SELECT MAX("number") FROM boxing_quads_2 WHERE "opponent" = 'julio césar vásquez'

Question: Who was the opponent of the match on 2006-04-08?
SQL: SELECT "opponent" FROM boxing_quads_2 WHERE "date" = '2006-04-08'

Question: What is the result of the match with Zab Judah as the opponent?
SQL: SELECT "result" FROM boxing_quads_2 WHERE "opponent" = 'zab judah'

Question: What is the date of the match with a result of ud 12/12 between Pernell Whitaker and James Mcgirt?
SQL: SELECT "date" FROM boxing_quads_2 WHERE "result" = 'ud 12/12' AND "name" = 'pernell whitaker' AND "opponent" = 'james mcgirt'