摘要:
create table test1(superid varchar2(20),id varchar2(20));insert into test1 values('0','1');insert into test1 values('0','2');insert into test1 values('1','11');insert into test1 values('1','12');inser... 阅读全文
随笔档案-2010年4月27日
转:Oracle中CONNECT BY LOOP的使用.非常不错
2010-04-27 17:30 by Tracy., 1864 阅读, 收藏,
摘要:
CONNECT BY LOOPA loop in user data generates an �ORA-01436: CONNECT BY loop in user data� error. A loop is defined in the Oracle Database SQL Language Reference (11.1) documentation as:A loop occurs i... 阅读全文
转:Oracle索引使用规则
2010-04-27 08:56 by Tracy., 1270 阅读, 收藏,
摘要:
逻辑上: Single column 单行索引 Concatenated 多行索引 Unique 唯一索引 NonUnique 非唯一索引 Function-based函数索引 Domain 域索引物理上: Partitioned 分区索引 NonPartitioned 非分区索引 B-tree: Normal 正常型B树 Rever Key 反转型B树 Bitmap 位... 阅读全文