CREATE TABLE "global_usage_share_data_from_net_applica" (
  "period" text,
  "internet_explorer" text,
  "firefox" text,
  "safari" text,
  "opera" text,
  "netscape" text,
  "other_mozilla" text
);

Question: What percentage of users were using Netscape during the period in which 21.67% were using Firefox?
SQL: SELECT "netscape" FROM "global_usage_share_data_from_net_applica" WHERE "firefox"='21.67%';

Question: What percentage of users were using Safari during the period in which 2.33% were using Opera?
SQL: SELECT "safari" FROM "global_usage_share_data_from_net_applica" WHERE "opera"='2.33%';

Question: What percentage of users were using Netscape during the period in which 63.67% were using Internet Explorer?
SQL: SELECT "netscape" FROM "global_usage_share_data_from_net_applica" WHERE "internet_explorer"='63.67%';

Question: What percentage of users were using Firefox during the period in which *0.77% were using Netscape?
SQL: SELECT "firefox" FROM "global_usage_share_data_from_net_applica" WHERE "netscape"='*0.77%';

Question: What percentage of users were using other Mozilla browsers during the period in which 2.29% were using Opera?
SQL: SELECT "other_mozilla" FROM "global_usage_share_data_from_net_applica" WHERE "opera"='2.29%';

Question: What percentage of users were using Opera during the period in which 63.67% were using Internet Explorer?
SQL: SELECT "opera" FROM "global_usage_share_data_from_net_applica" WHERE "internet_explorer"='63.67%';