Question: How many mens doubles when womens doubles is Catrine Bengtsson Margit Borg?
SQL: SELECT COUNT("Mens doubles") FROM "1-12171145-1" WHERE "Womens doubles" = 'Catrine Bengtsson Margit Borg';

Question: Who is the mens doubles when womens doubles is Anastasia Chervyakova Romina Gabdullina?
SQL: SELECT "Mens doubles" FROM "1-12171145-1" WHERE "Womens doubles" = 'Anastasia Chervyakova Romina Gabdullina';

Question: Who is themens doubles when the mens singles is Flemming Delfs?
SQL: SELECT "Mens doubles" FROM "1-12171145-1" WHERE "Mens singles" = 'Flemming Delfs';

Question: Who was the womens doubles when the mixed doubles is Jacco Arends Selena Piek?
SQL: SELECT "Womens doubles" FROM "1-12171145-1" WHERE "Mixed doubles" = 'Jacco Arends Selena Piek';

Question: Who was the mens doubles when womens singles is Mette Sørensen?
SQL: SELECT "Mens doubles" FROM "1-12171145-1" WHERE "Womens singles" = 'Mette Sørensen';