oracle的执行计划SQL> EXPLAIN PLAN FOR SELECT * FROM emp;已解释.SQL> SELECT plan_table_output FROM TABLE(DBMS_XPLAN.DISPLAY('PLAN_TABLE'));或者:SQL> select * from table(dbms_xplan.display); select distinct * from student; --排除重复对象 select * from(select e.*,r…
原文地址:http://blog.csdn.net/liumengcheng/article/details/34422475 入门请看http://blog.csdn.NET/liumengcheng/article/details/34409783 首先创建表 create table T_USERS ( ID NUMBER not null, NAME VARCHAR2(30), SEX VARCHAR2(3), BIRS DATE, MESSAGE CLOB…