在MySQL中查找具有相同值的列

Question

我有一张SQL表。我有兴趣寻找价格相同的书籍名称。我该如何实现？

View of my table

因此，根据此表，应该给我c和d，因为它们两个的价格均为1000。但是我无法这样做。请帮助

Answer 1

您需要将表自身连接到其中，并以价格作为连接条件。

类似

select distinct a.* 
  from book as a
  join book as b on (a.price = b.price)

sqlfiddle

Answer 2

Select price,group_concat(title)
from books
group by price having count(*) > 1

Answer 3

以下查询将返回您期望的结果作为相同价格的标题：

SELECT title 
FROM book
WHERE price IN (
  SELECT price
  FROM book 
  GROUP BY price
  HAVING COUNT(price) > 1
 )

Demo on SQLFiddle

Answer 4

SELECT Group_concat(title) 
FROM   books 
GROUP  BY price 
HAVING Count(*) >= 2; 

Demo on Sql Fiddle