实验12-05 查询只被借过1次的图书的图书名称作者和出版社

Posted 2020-12-05 masterchd

	在数据库Exam中查询只被借过1次的图书的图书名称、作者和出版社。

 

select distinct book.bno,book.bname,book.author,book.publish from Exam..book,Exam..borrow where book.bno
in
(
	select bno from Exam..borrow 
	group by borrow.bno
	having count(bno) = 1
)