📄 part3.txt
字号:
s-r
A B C
b g a
( SELECT MemNo
FROM MEMBER, BOOK
WHERE MemNo = BorrowerMemNo AND
CallNumber = 'QA76.9.D26C66'
)
EXCEPT
( SELECT MemNo
FROM MEMBER, BOOK
WHERE MemNo = BorrowerMemNo AND
CallNumber = 'QA76.9.D7E53'
);
The above statement returns a list of member numbers of the members only borrowing the book that has the call number QA76.9.D26C66 but not borrowing the book that has the call number QA76.9.D7E53.
⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -