摘要: sql:select gwlb, count(case when (year(getdate())-year(rybirthday)) between 20 and 30 then rygh end) as '20-30',count(case when (year(getdate())-year(rybirthday)) between 30 and 40 then rygh end) as '...阅读全文
摘要: 第一章:日志管理 1.forcing log switches sql> alter system switch logfile; 2.forcing checkpoints sql> alter system checkpoint; 3.adding online redo log groups sql> alter database add logfile [group 4]...阅读全文