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阿里云文档 2025-06-23

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阿里云文档 2025-06-23

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文章 2023-11-28 来自：开发者社区

数据库原理—SQL数据定义功能（九）（2）

数据库原理—SQL数据定义功能（九）（1）https://developer.aliyun.com/article/1385353

文章 2023-11-28 来自：开发者社区

数据库原理—SQL数据定义功能（九）（1）

数据库原理—SQL数据定义功能（九）数据库原理—SQL数据定义功能（九）（2）https://developer.aliyun.com/article/1385354

文章 2023-05-27 来自：开发者社区

一、SQL言语简介结构化查询语言SQL（Structured Query Language）是一种用于和关系数据库进行交互通信的计算机语言，用于存取数据以及查询、更新和管理关系数据库系统。同时它也是数据库脚本文件的扩展名。二、SQL语言应用SQL语言的应用更加广泛，Oracle、Sybase、Informix、Ingres、DB2、SQL Server、Rdb等大型数据库管理系统都实现了SQL语....

文章 2022-10-29 来自：开发者社区

数据库原理与应用（SQL Server）笔记第十一章游标

前言本章内容将从六个方面介绍关于游标的知识，分别是其定义、声明、打开、使用、关闭、删除，另外还会介绍静态游标和动态游标。一、游标的定义当对由SELECT语句返回的结果集中的某一行或部分行进行单独处理时，就要用到一种扩展，也就是游标，游标提供了对一个结果集进行逐行处理的能力。游标可以保存查询结果，方便下文调用，因为使用游标会保存数据行的副本，在创建游标后，下文查询即可从副本中查询，比直接查数据库快....

文章 2022-10-29 来自：开发者社区

数据库原理与应用（SQL Server）笔记第十章用户定义函数

前言本章内容将介绍数据库用户自定义T-SQL函数，以及其定义和调用。一、用户定义函数的定义用户定义函数，即是用户根据自己需要所定义的函数，它有允许模块化程序设计、执行速度快、减少网络流量等特点。创建好的用户定义函数可在当前数据库——可编程性——函数中找到，如下图：二、用户定义函数的分类用户定义函数分为两类，为内联表值函数和多语句表值函数。三、标量函数和内联表值函数内联表值函数是在RETURN 子....

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本页面内关键词为智能算法引擎基于机器学习所生成，如有任何问题，可在页面下方点击"联系我们"与我们沟通。

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