Question

有人可以为我写这个要求。我似乎无法在所有其他条件下加载空值。

- （1）没有艺术家是80岁或以上 - 当他们没有50或更年轻时 - 死了。

- （2）没有艺术家年龄54,56岁， - 他们去世时的71或76岁。

- （3）有些艺术家还活着。

- （4）德国和美国的艺术家 - 专注于摄影艺术（＆＃39; Photo＆＃39;） - 被排除在外。

- （5）没有艺术家有字母＆＃39; o＆＃39; - 姓氏的任何地方。

- （6）没有艺术家有名字 - ＆＃39; Hannah＆＃39; Julia＆＃39;或者＆＃39; Frasier＆＃39;。

select artist_id, first_name, last_name, died - born AS age, speciality, nationality
from simon_antiques
where Died - born Not in (54, 56, 71, 76)
  AND first_name NOT IN ('Hannah', 'Julia', 'Frasier')
  AND last_name not like '%o%'
  AND (nationality <> 'German' or speciality <> 'Photo')
  AND (died - born between 50 and 80 or died is null)
Order by last_name

这会加载所有结果，但不会加载仍然活着的艺术家。如果我将条件从括号中移出，它将带回所有活着的人，无论其他条件如何。

Answer 1

WHERE中的第一个子句仅匹配died不为空的行。鉴于此，您可以对子句重新排序：

WHERE first_name NOT IN ('Hannah', 'Julia', 'Frasier')
  AND last_name NOT LIKE '%o%'
  AND (nationality <> 'German' 
    OR speciality <> 'Photo')
  AND ((died - born BETWEEN 50 AND 80 
      AND Died - born NOT IN (54, 56, 71, 76)) 
    OR died IS NULL)

这应该带回那些当前活着的人。

SQL查询语法检查

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