摘要:
在vim中显示出特殊字符,设置方法: :set invlist vim中的特殊字符有: char digraph hex dec official name ~ ^@ NU 0x00 0 NULL (NUL) ^A SH 0x01 1 START OF HEADING (SOH) ^B SX 0x0 阅读全文
摘要:
student_score表如下: 表中张三的单元闯关成绩有2次,只保留最大值,其他删除,sql语句如下: delete from student_score where id not in ( select a.nid from (select id as nid,name,max(score) 阅读全文