CREATE TABLE table_14903999_1 (womens_doubles VARCHAR2, year VARCHAR2, mixed_doubles VARCHAR2, womens_singles VARCHAR2)

Who won womens doubles the year magn s ingi helgason tinna helgad ttir won mixed doubles and ragna ing lfsd ttir won womens singles in 2010
SELECT womens_doubles FROM table_14903999_1 WHERE mixed_doubles = "Magnús Ingi Helgason Tinna Helgadóttir" AND womens_singles = "Ragna Ingólfsdóttir" AND year = 2010
SELECT "womens_doubles" FROM "table_14903999_1" WHERE "Magnús Ingi Helgason Tinna Helgadóttir" = "mixed_doubles" AND "Ragna Ingólfsdóttir" = "womens_singles" AND "year" = 2010