单项选择题
Which substitution variable would you use if you want to reuse the variable without prompting the user each time? （）
A. & B. ACCEPT C. PROMPT D. &&
单项选择题 What is true about the WITH GRANT OPTION clause?（）
单项选择题 Which constraint can be defines only at the column level? （）
单项选择题 In which scenario would TOP N analysis be the best solution? （）
