Table: english_tennis_results
Columns: date_location
mens_singles
womens_singles
u21_mens
u21_womens
mixed_restricted
mixed_veteran

Question: Who was the U21 Mens winner when Mike Marsden was the mixed restricted winner and Claire Nelson was the U21 Womens winner? 
SQL: SELECT "u21_mens" FROM english_tennis_results WHERE "mixed_restricted" = 'Mike Marsden' AND "u21_womens" = 'Claire Nelson'

Question: When Naomi Owen won the Womens Singles and Ricardo Walther won the Mens Singles, who won the mixed veteran?
SQL: SELECT "mixed_veteran" FROM english_tennis_results WHERE "womens_singles" = 'Naomi Owen' AND "mens_singles" = 'Ricardo Walther'

Question: Who won the mixed restricted when Tomasz Rzeszotko won the mixed veteran and Karina Le Fevre won the U21 womens?
SQL: SELECT "mixed_restricted" FROM english_tennis_results WHERE "mixed_veteran" = 'Tomasz Rzeszotko' AND "u21_womens" = 'Karina Le Fevre'

Question: When and where did Eddie Smith win the mixed veteran?
SQL: SELECT COUNT("date_location") FROM english_tennis_results WHERE "mixed_veteran" = 'Eddie Smith'

Question: When Matt Ware won the mens singles, who won the mixed restricted?
SQL: SELECT "mixed_restricted" FROM english_tennis_results WHERE "mens_singles" = 'Matt Ware'

Question: When Paul Whiting won the mixed veteran, who won the mixed restricted?
SQL: SELECT "mixed_restricted" FROM english_tennis_results WHERE "mixed_veteran" = 'Paul Whiting'