摘要: 隐式转化规则 官方文档中关于隐式转化的规则是如下描述的: If one or both arguments are NULL, the result of the comparison is NULL, except for the NULL-safe <=> equality comparison 阅读全文
posted @ 2017-10-09 16:14 刘竹青 阅读(1834) 评论(0) 推荐(0) 编辑