云数据库RDS SQLServer版算法的相关内容

文章 2025-02-26 来自：开发者社区

sql server加密算法加盐

SQL Server 加密算法加盐在数据安全中，密码加密和加盐是确保数据完整性和安全性的关键措施。SQL Server 提供了一系列加密和哈希函数，可用于存储和验证密码。本文将详细介绍如何在 SQL Server 中实现密码加盐和加密，并解释其重要性和实现细节。一、加盐和加密的概念加盐（Salting）：...

文章 2022-02-16 来自：开发者社区

SQL Server 自动更新统计信息的基本算法

最初接触SQL Server的时候认为SQLServer数据更改的同时就会相应的更新统计信息，其实SQL Server不是这样做的.基于性能考虑，SQL Server使用下面的算法更新统计信息。自动更新统计信息的基本算法是： · 如果表格是在 tempdb数据库表的基数是小于 6，自动更新到表的每个六个修改。 · 如果表的基数是大于 ...

文章 2022-02-16 来自：开发者社区

SQL Server对比两字段的相似度（函数算法）

概述比较两个字段的相似度最近有人问到关于两个字段求相似度的函数，所以就写了一篇关于相似度的函数，分别是“简单的模糊匹配”，“顺序匹配”，“一对一位置匹配”。在平时的这种函数可能会需要用到，可能业务需求不一样，这里只给出参照，实际情况可以相对修改。本文所有的两个字段比较都是除以比较字段本身，例如A与B比较，找出的长度除以A的长度，...

文章 2022-02-16 来自：开发者社区

SQL Server 2005 hash联接算法

如果两个联接输入都很大，而且这两个输入的大小差不多，则预先排序的合并联接提供的性能与哈希联接相近。但是，如果这两个输入的大小相差很大，则哈希联接操作通常快得多。哈希联接可以有效处理未排序的大型非索引输入。它们对复杂查询的中间结果很有用，因为： ·&n...

文章 2022-02-16 来自：开发者社区

　　随着“金盾工程”建设的逐步深入和公安信息化的高速发展，公安计算机应用系统被广泛应用在各警种、各部门。与此同时，应用系统体系的核心、系统数据的存放地――数据库也随着实际应用而急剧膨胀，一些大规模的系统，如人口系统的数据甚至超过了1000万条，可谓海量。那么，如何实现快速地从这些超大容量的数据库中提取数据（查询）、分析、统计以及提取数据后进行数据分页已成为各地系统管理员和数据库管理员亟待解决的难....

文章 2022-02-16 来自：开发者社区

SQL Server对比两字段的相似度（函数算法）

原文:SQL Server对比两字段的相似度（函数算法）相似度函数概述比较两个字段的相似度最近有人问到关于两个字段求相似度的函数，所以就写了一篇关于相似度的函数，分别是“简单的模糊匹配”，“顺序匹配”，“一对一位置匹配”。在平时的这种函数可能会需要用到，可能业务需求不一样，这里只给出参照，实际情况可以相对修改。本文所有的两个字段比较都是...

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