sql - 特殊字符的 order by 规则是什么？

Question

我使用 select pk_customer_no from customer order by pk_customer_no 对数据进行排序 带“-”的代码，没有分组并按字母排序，看来sql只是忽略它并按第三个字母排序。

如何按“-”排序？

Answer 1

排序时会忽略“-”字符。

如果您想将带有“-”的单词放在前面，可以通过将“-”替换为“0”(零)来使用 order。

select t.pk_customer_no as rep from ( 
   values ('YH'), ('YHC'), ('Z-CH'), ('Z-CHE'), ('ZCM'), ('Z-CP'), ('Z1'), ('ZHT'), ('ZLA'), ('Z-JP'), ('ZLENO') 
) as t (pk_customer_no)
order by replace(t.pk_customer_no, '-', '0')

如果您想将带有“-”的单词放在末尾，可以通过将“-”替换为“Z”来使用 order。

select t.pk_customer_no as rep from ( 
       values ('YH'), ('YHC'), ('Z-CH'), ('Z-CHE'), ('ZCM'), ('Z-CP'), ('Z1'), ('ZHT'), ('ZLA'), ('Z-JP'), ('ZLENO') 
) as t (pk_customer_no)
order by replace(t.pk_customer_no, '-', 'Z')