Table: tennis_championships
Columns: year
mens_singles
womens_singles
mens_doubles
womens_doubles
mixed_doubles

Question: What was the earliest year Þorvaldur Ásgeirsson Lovísa Sigurðardóttir won mixed doubles
SQL: SELECT MIN("year") FROM tennis_championships WHERE "mixed_doubles" = 'Þorvaldur Ásgeirsson Lovísa Sigurðardóttir'

Question: Who won womens doubles the year magnús ingi helgason tinna helgadóttir won mixed doubles and ragna ingólfsdóttir won womens singles in 2010
SQL: SELECT "womens_doubles" FROM tennis_championships WHERE "mixed_doubles" = 'Magnús Ingi Helgason Tinna Helgadóttir' AND "womens_singles" = 'Ragna Ingólfsdóttir' AND "year" = 2010

Question: How many womens doubles had champions the years broddi kristjánsson drífa harðardóttir won mixed doubles
SQL: SELECT COUNT("womens_doubles") FROM tennis_championships WHERE "mixed_doubles" = 'Broddi Kristjánsson Drífa Harðardóttir'

Question: Who won mixed doubles the years einar jónsson wagner walbom won mens doubles and wagner walbom won mens singles
SQL: SELECT "mixed_doubles" FROM tennis_championships WHERE "mens_doubles" = 'Einar Jónsson Wagner Walbom' AND "mens_singles" = 'Wagner Walbom'

Question: What was the last year árni þór hallgrímsson drífa harðardóttir won mixed doubles
SQL: SELECT MAX("year") FROM tennis_championships WHERE "mixed_doubles" = 'Árni Þór Hallgrímsson Drífa Harðardóttir'

Question: Who won mens singles the year sveinn logi sölvason tryggvi nilsen won mens doubles and elsa nielsen won womens singles
SQL: SELECT "mens_singles" FROM tennis_championships WHERE "mens_doubles" = 'Sveinn Logi Sölvason Tryggvi Nilsen' AND "womens_singles" = 'Elsa Nielsen'