allegro 163 constraint 没有 Electrical
我在做sqlldr时出几条信息无法导入，提示为： Record 2: Rejected - Error on table TRANLOG. ORA-00001: unique constraint (XXGL.PKTRANLOG1) violated Record 3: Rejected - Error on table TRANLOG. ORA-00001: unique constraint (XXGL.PKTRANLOG1) violated 我想知道这个约束具体怎么定义的，查user_constraints和dba_constraints都查不到，删也删除不了，而TRANLOG表中也没有这些记录信息重复。 请各位大侠帮忙，该如何解...
by sigin - Oracle - 2004-12-07 17:11:08 阅读（1663） 回复（7）
From wikipedia, constraints differ from the common primitives of imperative programming languages in that they do not specify a step or sequence of steps to execute, but rather the properties of a solution to be found Imagine this, you want to solve a problem, the algorithm for which you do not know. You just know the problem. Assume that there exists an alternate world where you only need to ...
各位老大.我在SCO 做informix,数据库dbimport 时,提示constraint name(n1209_6)已存在.急急.谁能帮我啊 :em02: :em02: :em02:
The quick answer is: 2^63-1 for the archive, 68'719'476'735 (8^12-1) bytes for each file, if your environment permits that. as I understand your question, you want to know if you can produce tar files that are biger than 2 GBytes (and how big you can really make them). The answer to this question depends on a few simple parameters: 1) Does your operating system support large files? 2) What vers...
在学习constraint的时候有一个enable novalidate 的选项。说允许表中有违反约束条件的数据，但是新的数据违反约束条件就不能插入数据表中。但是我做了个实验，发现不行 create table t1 (col1 varchar2(10) constraint t1_col1_pky PRIMARY KEY); insert into t1 values ('aaa'); commit' insert into t1 values ('bbb') commit; insert into t1 values ('ccc'); commit; alter table t1 disable constraint t1_col1_pky insert in...
select distinct constraint_type from dba_constraints; 结果： constraint_TYPE ? C --check O P --primary key R --forgien key U --unique V 其他三个是什么？
请问： alter table ... disable constraint... alter table ... enable novalidate constraint 有什么区别
一直安装不成功，近四天了 尝试了无数次。 最接近的是在package manager下升级安装 但运行测试程序有窗口跳出，无hello world字样。 我想要的是离线安装。 一 按照以下方法安装： http://euclid.ik8.com/doc/allegro_dev-cpp.txt allegro之Dev-Cpp版上手指南 安装后显示： Microsoft Windows XP [版本 5.1.2600] (C) 版权所有 1985-2001 Microsoft Corp. C:\Documents and Settings\i'm back>make install misc\mdh...
