【简答题】把相应的问句与答句搭配起来。 ( )1. Do you like hot dog? ( )2. Would you like some tea? ( )3. What would you like? ( )4. How much for one donut? ( )5. How many bottles of pop? ( )6. Are you t...
【简答题】查询scott用户的emp表中的总记录数,可以使用下列哪个语句?A. SELECT MAX(empno) FROM scott.emp; B. SELECT COUNT(empno) FROM scott.emp; C. SELECT COUNT(comm) FROM scott.emp; D. SELECT COUNT(*) FROM scott.emp;