CREATE TABLE "global_usage_share_of_desktop_browsers_d" (
  "period" text,
  "internet_explorer" text,
  "firefox" text,
  "chrome" text,
  "safari" text,
  "opera" text,
  "other" text
);

Question: What internet explorer has 1.67% as the opera, with 2012 q1 as the period?
SQL: SELECT "internet_explorer" FROM "global_usage_share_of_desktop_browsers_d" WHERE "opera"='1.67%' AND "period"='2012 q1';

Question: What safari has 2012 q4 as the period?
SQL: SELECT "safari" FROM "global_usage_share_of_desktop_browsers_d" WHERE "period"='2012 q4';

Question: What period has 53.52% as the internet explorer?
SQL: SELECT "period" FROM "global_usage_share_of_desktop_browsers_d" WHERE "internet_explorer"='53.52%';

Question: What is the other that has 20.80% as the firefox?
SQL: SELECT "other" FROM "global_usage_share_of_desktop_browsers_d" WHERE "firefox"='20.80%';

Question: What opera has 19.87% as the firefox?
SQL: SELECT "opera" FROM "global_usage_share_of_desktop_browsers_d" WHERE "firefox"='19.87%';