SQL语句PART10
oracle tips
Exist的用法：
select gw.ndocid from
(select ndocid from wf_doc_gw_shouwen union select ndocid from wf_doc_gw_fawen) gw
where
not exists (select null from wf_doc_gw_sn sn where sn.ndocid=gw.ndocid)
2。把GW表和SN表里相同的NDOCID显示出来
select gw.ndocid from
(select ndocid from wf_doc_gw_shouwen union select ndocid from wf_doc_gw_fawen) gw
where
exists (select null from wf_doc_gw_sn sn where sn.ndocid=gw.ndocid)
DECODE的语法：DECODE(value,if1,then1,if2,then2,if3,then3,...,else)，
e.g.:
select decode(max(documentid), null, 1, (max(documentid)+1))) from document;
results:
if null, display 1
else display max(documentid)+1
1. export database
cmd
%oracle_home%\bin\exp carmot/carmot@132.159.178.236_igrp2 file=d:\a.dmp
2. oracle enterprise console
connect as sysdba
安全性，右键，建立用户carmot_hunan_1,密码用carmot
给dba权限。
3. import database
cmd
%oracle_home%\bin\imp carmot_hunan_1/carmot@132.159.178.236_igrp2 file=d:\a.dmp fromuser=carmot
** remarks:
carmot_hunan_1/carmot@132.159.178.236_igrp2
用户名/密码@配置在TOAD中的数据库名称
例如: TOAD中数据库的名称是: IGRP2_132.159.178.236, 则为: carmot_hunan_1/carmot@igrp2_132.159.178.236
Example for complicated select:
select distinct first_value(ndocid) over (partition by ndocid order by lv desc) as ndocid,
--first_value(curtitle) over (partition by ndocid order by lv desc) as
curtitle,
first_value(realname) over (partition by ndocid order by lv desc) as realname
from(
select ndocid,curtitle, sys_connect_by_path(realname,' ') realname, level lv from
(select ndocid, curtitle,realname, lag(realname,1,null) over (partition by ndocid order by realname) realname_1
from (select g.ndocid,g.curtitle, u.realname
from wf_doc_gw g, tbuser u
where instr(','||g.cprocuserlist||',',','||u.userid||',')>0)) connect by prior realname=realname_1) order by ndocid
e.g.:
select g.ndocid, g.cproc
相关文档：
基本方法:
UPDATETEXT { table_name.dest_column_name dest_text_ptr }//{ 要更新的表以及 text、ntext 或 image 列的名称,指向要更新的 text、ntext 或 image 数据的文本指针的值（由 TEXT ......
4、对象依赖性
CREATE OR REPLACE TYPE Obj1 AS OBJECT (
f1 NUMBER,
f2 VARCHAR2(10),
f3 DATE
);
/
CREATE OR REPLACE TYPE Obj2 AS OBJECT (
f1 DATE,
f2 CHAR(1)
);
/
CREATE OR REPLACE TYPE Obj3 AS OBJECT (
a Obj1,
b Obj2
);
/
OBJ3依赖于OBJ ......
--1加内存表
EXEC sp_tableoption '表名','pintable', 'true'
--2卸载内存表
EXEC sp_tableoption '表名','pintable', 'false'
--2查询是否有内存表驻留
SELECT * from INFORMATION_SCHEMA.Tables
WHERE TABLE_TYPE = 'BASE TABLE'
AND OBJECTPROP ......
CREATE VIEW MYVIEW
AS
SELECT * from bjxxdiweb_database2007.dbo.bm_tongji
UNION ALL
SELECT * from aa.DBO.chen
select * into aa..chen from bjxxdiweb_database2007.dbo.bm_tongji where 1=2
说明：数据库A的表的字段名必须和数据库B的表的字段名相同，包括数据类型等。 ......
