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阿里云文档 2025-05-23

如何使用CREATE SQL FUNCTION创建永久SQL语言定义函数并存入Meta系统

SQL语言定义的用户自定义函数（UDF）弥补了MaxCompute只能使用Java或Python创建UDF的不足，并扩展了UDF参数类型的范围，支持函数类型的参数，从而提升了表达业务逻辑的灵活性。SQL UDF支持永久UDF和临时UDF，本文为您介绍通过CREATE SQL FUNCTION命令创建永久SQL UDF。

阿里云文档 2025-04-29

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为了使不熟悉SQL语言的用户能够方便地从数据库中进行数据分析，PolarDB for AI推出了自研的基于大语言模型的自然语言到SQL语言转义（Large Language Model based Natural Language to SQL，简称LLM-based NL2SQL）AI模型，作为内置模型供您使用。与传统的NL2SQL方法相比，LLM-based NL2SQL模型在语言理解能力上更...

阿里云文档 2025-04-29

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SQL语言定义的用户自定义函数（UDF）扩展了MaxCompute的功能，支持更多参数类型和函数类型的入参。本文介绍如何通过FUNCTION命令创建临时SQL UDF。

文章 2024-06-05 来自：开发者社区

SQL 语言：完整性约束

概述数据库的完整性是指数据库正确性和相容性，是防止合法用户使用数据库时向数据库加入不符合语义的数据。保证数据库中数据是正确的，避免非法的更新。数据库完整性重点需要掌握的内容有：完整性约束条件的分类、完整性控制应具备的功能。完整性约束类别大概分为实体完整性约束、参照完整性约束、自定义完整性约束三类。实体完整性约束：非空值约束（NOT NULL）、默...

阿里云文档 2023-09-03

如何使用SELECTFUNCTION调用SQL语言定义函数_云原生大数据计算服务 MaxCompute(MaxCompute)

调用SQL语言定义函数的方式和现有内建函数的调用方式一致。

阿里云文档 2023-07-19

通过Go语言的SQL包开发Lindorm宽表应用的方法和示例

本文介绍通过Go语言的database/sql包使用SQL开发Lindorm宽表应用的方法和示例。

文章 2022-02-17 来自：开发者社区

PostgreSQL 10.1 手册_部分 II. SQL 语言_第 13 章并发控制_13.4. 应用级别的数据完整性检查

13.4. 应用级别的数据完整性检查 13.4.1. 用可序列化事务来强制一致性 13.4.2. 使用显式锁定强制一致性对于使用读已提交事务的数据完整性强制业务规则非常困难，因为对每一个语句数据视图都在变化，并且如果一个写冲突发生即使一个单一语句也不能把它自己限制到该语句的快照。虽然一个可重复读事务在其执行期间有一个稳定的数据视图，在使用MVCC快照进行数据一致性检查时也有一个小问题...

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