CREATE TABLE "doubles_17" (
  "edition" text,
  "round" text,
  "date" text,
  "partnering" text,
  "against" text,
  "surface" text,
  "opponents" text,
  "w_l" text,
  "result" text
);

Question: How many rounds were there in the 2006 davis cup europe/africa group I?
SQL: SELECT COUNT("round") FROM "doubles_17" WHERE "edition"='2006 Davis Cup Europe/Africa Group I';