Question

我正在Hackerrank上进行挑战，问题是表'STATION'中所有城市的返回列表，这些城市中的城市不以元音开头，也不以元音结尾。

此查询无效：

select distinct CITY from STATION where CITY NOT LIKE '[A,E,I,O,U]% 
[a,e,i,o,u]'

但是此查询确实有效：

select distinct CITY from STATION where CITY NOT LIKE '[A,E,I,O,U]%' 
AND CITY NOT LIKE '%[a,e,i,o,u]'

任何人都可以帮助我理解为什么第一个查询不起作用吗？

Answer 1

您的第二个查询工作正常-因为逗号不会出现在名称的开头或结尾。

极有可能。理想的解决方案是单一模式：

where city like '[^aeiou]%[^aeiou]'

Answer 2

select distinct city
from station
where city rlike '^[^aeiouAEIOU].*' and city rlike '^.*[^aeiouAEIOU]$'

Answer 3

尝试一下：

    SELECT DISTINCT CITY  FROM STATION  WHERE UPPER(SUBSTR(CITY, 1, 1)) NOT IN ('A', 'E', 'I', 'O', 'U')
     AND UPPER(SUBSTR(C.CITY, LENGTH(CITY), 1)) NOT IN ('A', 'E', 'I', 'O', 'U')

Answer 4

尝试使用MySQL解决方案：

select distinct CITY from STATION where substr(CITY, 1, 1) not in ('a','e','i','o','u') and substr(CITY, -1, 1) not in ('a','e','i','o','u');

Answer 5

lightSelector

不是以元音开头，也不是以元音结尾

5 个答案: