sql - 非常简单的查询

Question

有人问我是否有更好的方法来编写这个查询，我想不出。请帮忙：

 select bookid, bookname
   from books
  where bookname not like 'D%' or bookname not like 'F%'

Answer 1

SELECT bookid,
       bookname
FROM   books
WHERE  bookname IS NOT NULL 

维护原始查询的语义。也许您打算使用AND而不是OR

SELECT bookid,
       bookname
FROM   books
WHERE  bookname NOT LIKE '[DF]%'