Table: web_browser_usage_2
Columns: date
internet_explorer
firefox
safari
opera

Question: What is the safari value with a 2.4% opera and 29.9% internet explorer?
SQL: SELECT "safari" FROM web_browser_usage_2 WHERE "opera" = '2.4%' AND "internet_explorer" = '29.9%'

Question: What is the firefox value with a 1.9% safari?
SQL: SELECT "firefox" FROM web_browser_usage_2 WHERE "safari" = '1.9%'

Question: What is the firefox value with a 1.8% opera on 30 July 2007?
SQL: SELECT "firefox" FROM web_browser_usage_2 WHERE "opera" = '1.8%' AND "date" = '30 july 2007'

Question: What is the date when internet explorer was 62.2%
SQL: SELECT "date" FROM web_browser_usage_2 WHERE "internet_explorer" = '62.2%'

Question: What is the firefox value with a 22.0% internet explorer?
SQL: SELECT "firefox" FROM web_browser_usage_2 WHERE "internet_explorer" = '22.0%'

Question: What is the safari value with a 28.0% internet explorer?
SQL: SELECT "safari" FROM web_browser_usage_2 WHERE "internet_explorer" = '28.0%'