SQL Developer 常用 hotkeys

1. ctrl-enter : executes the current statement(s)
2. F5 : executes the current code as a script (think SQL*Plus)
3. ctrl-space : invokes code insight on demand 
4. ctrl-Up/Dn : replaces worksheet with previous/next SQL from SQL History
5. ctrl-shift+Up/Dn : same as above but appends instead of replaces
6. shift+F4 : opens a Describe window for current object at cursor
7. ctrl+F7 : format SQL
8. ctrl+/ : toggles line commenting
9. ctrl+e : incremental search

Reference
[1] http://www.thatjeffsmith.com/archive/2012/11/keyboard-shortcuts-in-oracle-sql-developer/