摘要：
查询ORACLE字符集 --select userenv('language') from dual; --select * from v$nls_parameters; --select * from nls_database_parameters; --select * from sys.props$; mysql:show variables like '%char%'; SQLSE... 阅读全文
摘要：
oracle select * from ( select rownum as rn,HDMS.HD_PURGE_STATUS.* from HDMS.HD_PURGE_STATUS where rownum 10 and rn2) YY; MySQL select * from sakila.actor limit 10,10; 数据量大时，2个参数limit性能有影响，用如下：vid是表... 阅读全文