摘要:
/**删除重复数据,保留一条**/ delete from table1 a where (a.id1,a.id2) in (select id1,id2 from table1 group by id1,id2 having count(*) > 1) and rowid not in (sele 阅读全文
摘要:
SQL>sqlplus /as sysdba SQL>select count(*) from v$process; SQL>select count(*) from v$session; SQL>select value from v$parameter where name ='processe 阅读全文