Community
Learn
Tools Library
AI Tools
Leisure
search
English
Home Database Mysql Tutorial mysql中关于外键约束的小问题

mysql中关于外键约束的小问题

Jun 06, 2016 am 09:32 AM
mysql

mysql

我想问，主表被references后不允许先删除记录，又说从表指定on delete cascade后删除主表记录时从表记录随之删除，你说这不矛盾吗？到底让不让删除？
例如下面这张图，student_table参考teacher_table,我却删不掉主表teacher_table图片说明

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

Hot Article

Repo: How To Revive Teammates
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
1 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
How Long Does It Take To Beat Split Fiction?
3 weeks ago By DDD
Hello Kitty Island Adventure: How To Get Giant Seeds
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Difficulty in updating caching of official account web pages: How to avoid the old cache affecting the user experience after version update?
3 weeks ago By 王林
Show More

Hot tools Tags

Code&IT
Voice
Business
Marketing
AI Detector
Chatbot
Design&Art

Hot Article

Repo: How To Revive Teammates
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
1 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
How Long Does It Take To Beat Split Fiction?
3 weeks ago By DDD
Hello Kitty Island Adventure: How To Get Giant Seeds
3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Difficulty in updating caching of official account web pages: How to avoid the old cache affecting the user experience after version update?
3 weeks ago By 王林
Show More

Hot Article Tags

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Show More

Hot Topics

Where is the login entrance for gmail email?
7296
9
Java Tutorial
1622
14
CakePHP Tutorial
1342
46
Laravel Tutorial
1259
25
PHP Tutorial
1206
29
Show More
Related knowledge
PHP's big data structure processing skills PHP's big data structure processing skills May 08, 2024 am 10:24 AM

PHP's big data structure processing skills

How to optimize MySQL query performance in PHP? How to optimize MySQL query performance in PHP? Jun 03, 2024 pm 08:11 PM

How to optimize MySQL query performance in PHP?

How to use MySQL backup and restore in PHP? How to use MySQL backup and restore in PHP? Jun 03, 2024 pm 12:19 PM

How to use MySQL backup and restore in PHP?

How to insert data into a MySQL table using PHP? How to insert data into a MySQL table using PHP? Jun 02, 2024 pm 02:26 PM

How to insert data into a MySQL table using PHP?

What are the application scenarios of Java enumeration types in databases? What are the application scenarios of Java enumeration types in databases? May 05, 2024 am 09:06 AM

What are the application scenarios of Java enumeration types in databases?

How to fix mysql_native_password not loaded errors on MySQL 8.4 How to fix mysql_native_password not loaded errors on MySQL 8.4 Dec 09, 2024 am 11:42 AM

How to fix mysql_native_password not loaded errors on MySQL 8.4

How to use MySQL stored procedures in PHP? How to use MySQL stored procedures in PHP? Jun 02, 2024 pm 02:13 PM

How to use MySQL stored procedures in PHP?

Performance optimization strategies for PHP array paging Performance optimization strategies for PHP array paging May 02, 2024 am 09:27 AM

Performance optimization strategies for PHP array paging

See all articles