通过Oracle中的merge实现根据一张表的内容更新另外张表数据的功能-Mysql Tutorial-php.cn

Home

Database

Mysql Tutorial

通过Oracle中的merge实现根据一张表的内容更新另外张表数据的功能

WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB

Jun 07, 2016 pm 05:17 PM

最近由于项目需要一直想找个关于Oracle中实现根据一张表的内容更新另外张表数据的功能，在网上找了半天也没找到个合适的方法，虽

最近由于项目需要一直想找个关于Oracle中实现根据一张表的内容更新另外张表数据的功能，在网上找了半天也没找到个合适的方法，虽然看到有人说可以通过存储过程来实现，但觉得那样太麻烦，今在查找同样的功能时发现了Oracle中的merge，于是花了点时间用比较简单的方法实现了这个功能。语法就免了，网上一搜一堆，看具体语句吧，代码也比较简单，通过字面就可以理解了，，最简单的版本应是：

具体项目中的语句是：

merge具有更新和插入的功能，如果通过On关系没有找到匹配的则会新增结果，如果只想单纯的更新数据只要把后面的关于插入的操作注释掉就好。

linux

Statement

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

How do you alter a table in MySQL using the ALTER TABLE statement?Mar 19, 2025 pm 03:51 PM

The article discusses using MySQL's ALTER TABLE statement to modify tables, including adding/dropping columns, renaming tables/columns, and changing column data types.

How do I configure SSL/TLS encryption for MySQL connections?Mar 18, 2025 pm 12:01 PM

Article discusses configuring SSL/TLS encryption for MySQL, including certificate generation and verification. Main issue is using self-signed certificates' security implications.[Character count: 159]

How do you handle large datasets in MySQL?Mar 21, 2025 pm 12:15 PM

Article discusses strategies for handling large datasets in MySQL, including partitioning, sharding, indexing, and query optimization.

What are some popular MySQL GUI tools (e.g., MySQL Workbench, phpMyAdmin)?Mar 21, 2025 pm 06:28 PM

Article discusses popular MySQL GUI tools like MySQL Workbench and phpMyAdmin, comparing their features and suitability for beginners and advanced users.[159 characters]

How do you drop a table in MySQL using the DROP TABLE statement?Mar 19, 2025 pm 03:52 PM

The article discusses dropping tables in MySQL using the DROP TABLE statement, emphasizing precautions and risks. It highlights that the action is irreversible without backups, detailing recovery methods and potential production environment hazards.

How do you create indexes on JSON columns?Mar 21, 2025 pm 12:13 PM

The article discusses creating indexes on JSON columns in various databases like PostgreSQL, MySQL, and MongoDB to enhance query performance. It explains the syntax and benefits of indexing specific JSON paths, and lists supported database systems.

How do you represent relationships using foreign keys?Mar 19, 2025 pm 03:48 PM

Article discusses using foreign keys to represent relationships in databases, focusing on best practices, data integrity, and common pitfalls to avoid.

How do I secure MySQL against common vulnerabilities (SQL injection, brute-force attacks)?Mar 18, 2025 pm 12:00 PM

Article discusses securing MySQL against SQL injection and brute-force attacks using prepared statements, input validation, and strong password policies.(159 characters)

See all articles