WHAT IS THE BROWSER ID OF OPERA
SELECT T1.id FROM browser AS T1 JOIN accelerator_compatible_browser AS T2 ON T1.id  =  T2.browser_id JOIN web_client_accelerator AS T3 ON T2.accelerator_id  =  T3.id WHERE T1.name  =  "Opera"
browser ID refers to T1.id; browser name 'Opera' refers to T1.name = \"Opera\";