摘要：@echo off :: 取当前年月日set year=%date:~0,4%set month=%date:~5,2%set day=%date:~8,2%:: 取from目录set from1="C:\Linyuan\test\from1"set from2="C:\Linyuan\test\f 阅读全文

摘要：select sex,count(*) from table where count(*)>5 报错 sql语句的执行过程是： from-->where-->group by -->having --> select >order by; 聚合函数针对结果集，where并不是在结果集后运行。 hav 阅读全文