sql - ORA-00937 : not a single-group group function

Question

SELECT MIN(retail)
FROM books
WHERE category = 'COMPUTER'

工作正常，但是当我在选择中包含标题时:

SELECT MIN(retail), title
FROM books
WHERE category = 'COMPUTER'

它没有。为什么？如何使它工作？

Answer 1

Rhys 的回答是正确的，如果这就是你的意思，但你可能想要 title (s) 哪里 retail=MIN(retail) ，并且该措辞表明如何获得该答案:

SELECT title, retail
FROM books
WHERE category = 'COMPUTER'
 AND retail = (SELECT MIN(retail) FROM books WHERE category = 'COMPUTER')

为了减少重复，您可以使用 WITH子句(如果您使用的是最新版本的 SQL):

;WITH ComputerBooks AS (
  SELECT title, retail
  FROM books
  WHERE category = 'COMPUTER')
SELECT title, retail
FROM ComputerBooks
WHERE retail = (SELECT MIN(retail) FROM ComputerBooks)

Sample I used to confirm syntax.