简体中文(ZH-CN) English(EN) 繁体中文(ZH-TW) 日本語(JA) 한국어(KO) Melayu(MS) Français(FR) Deutsch(DE)
Home > Database > Mysql Tutorial > body text

Oracle PL/SQL之ENABLE NOVALIDATE约束

WBOY
Release： 2016-06-07 17:02:54
Original
1155 people have browsed it

在看Oracle约束时，看到ENABLE NOVALIDATE，意思是对自现在起及以后的数据启用约束，但是不管以前的数据怎样。不过在实验的时候却

在看Oracle约束时，看到ENABLE NOVALIDATE，意思是对自现在起及以后的数据启用约束，但是不管以前的数据怎样。

不过在实验的时候却出了一点小问题：

Google一下，发现原来在创建没有延时的UNIQUE或者PRIMARY KEY时会自动去创建一个唯一性索引。（By default a non-deferrable UNIQUE or PRIMARY KEY constraint will attempt to create a unqiue index. ?p=100:11:0::::P11_QUESTION_ID:8806498660292）

加上DEFERRABLE关键字，，问题成功解决：

linux

Related labels：
Oracle教程 Oracle PL/SQL之ENABLE
source：php.cn
Previous article：Oracle用户配置文件概述 Next article：Oracle数据库审计概述
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Latest Articles by Author
Latest Issues
Regular expression filter for MERN stack search boxes and checkboxes I'm trying to understand how the MERN stack works together by learning by doing, and I'm f...
From 2024-04-06 14:53:12
0
1
425
How to render data through DOM instead of through table I have a question about an application I'm creating, I'm using an Oracle database and I'm ...
From 2024-04-04 18:17:27
0
1
3567
Prestashop installation issue: Unable to install custom module I am new to Prestashop module development. I'm trying to build Amy's first prestashop modu...
From 2024-04-03 19:24:44
0
1
402
PHP Tutorial: How to upload text and images to Linkedin using PHP? I try to upload text, images and links using LinkedinsRestAPI (https://learn.microsoft.com...
From 2024-04-03 18:42:29
0
1
420
Unable to receive information from my mySQL database despite having seen tutorials doing the exact same thing So I'm trying to make a program that reads and writes to a MySQL database, which led me to...
From 2024-04-03 14:46:04
0
1
298
Related Topics
More>
Popular Recommendations
Popular Tutorials
More>
Related Tutorials
Popular Recommendations
Latest courses
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template
About us Disclaimer Sitemap
php.cn：Public welfare online PHP training，Help PHP learners grow quickly！