题解
请按城市对客户进行排序,如果城市为空,则按国家排序
https://www.nowcoder.com/practice/c1b1d5bd008b4797ab2ef53a3afc4aba
select * from customers_info order by( case when city is not null then city else country end )
请按城市对客户进行排序,如果城市为空,则按国家排序
https://www.nowcoder.com/practice/c1b1d5bd008b4797ab2ef53a3afc4aba
select * from customers_info order by( case when city is not null then city else country end )
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