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所在平台: Udemy |
课程主页: https://www.udemy.com/course/beginners-guide-to-developing-sql-queries-for-sql-server/
课程评论:没有评论
**课程名称:SQL Server 数据库查询入门指南** **课程概述:** 本课程是为初学者设计的,旨在教授如何使用 SQL(结构化查询语言)来查询和操作 Microsoft SQL Server 数据库。Microsoft SQL Server 作为一款强大的关系型数据库管理系统,被众多组织广泛使用。 **课程内容涵盖:** * **数据检索:** * 使用 SELECT 语句检索数据 * 使用别名 (Aliases) * 使用 CASE 表达式 * 从视图 (View) 中检索数据 * 消除重复数据 (DISTINCT) * 使用各种过滤器进行数据筛选: * 相等性过滤器 * 基本比较运算符 * 字符串比较 * 逻辑运算符 (AND, OR, NOT) * NULL 值比较 * **数据排序:** * 使用 ORDER BY 子句对数据进行排序 * 按升序排序 * 按多个列进行排序 * **数据操作:** * 添加新记录 (INSERT) * 更新现有记录 (UPDATE) * 删除记录 (DELETE) * **多表数据联合:** * 使用 JOIN 语句从多个表中检索数据,包括: * 内连接 (INNER JOIN) * 左外连接 (LEFT OUTER JOIN) * 右外连接 (RIGHT OUTER JOIN) * **数据汇总与分组:** * 使用聚合函数 (Aggregate Functions) 对数据进行汇总,如: * COUNT (计数) * SUM (求和) * AVG (平均值) * MIN (最小值) * MAX (最大值) * 使用 GROUP BY 子句对数据进行分组 * 结合 ORDER BY 子句进行分组后的排序 **学习目标:** 通过本课程的学习,学员将能够: * 掌握 SQL 的基本语法,理解其在关系型数据库操作中的核心地位。 * 编写简单的 SQL 查询语句,以从 SQL Server 数据库中准确地检索和操作数据。 * 获得选择最佳查询方法的实践技能,以确保数据准确性并避免常见错误。 * 充分挖掘 SQL 的潜力,提升数据处理和分析的能力。
Microsoft SQL Server is robust relational database management system used by so many organizations of various sizes including top fortune 100 companies. SQL -Structural Query language is the language used to interrogate and manipulateMicrosoft SQL Server Databases. This course is a beginners course that will walk you through how to develop queriesto execute on and SQL Server Database. We will start by developing queries to:Retrieve data with SELECT Use Aliases Use Case Expressions Retrieve data from a view Eliminate duplicatesFilter data with equality filters Filter data with basic comparisons Filter data with string comparisons Filter data with logical comparisons Filter data with NULL comparisons Use order by clauseSort data by ascending order Sort data by multiple columns Add new records Update existing records Delete records There may be times when want to retrieve data from multiple tables and in coursewe will do that using: Inner joins Left outer joins Right Outer joins We will also be Summarising data with aggregate functions such as: COUNT SUM AVG MIN MAX Grouping data ORDER BY Clause SQL forms the cornerstone of all relational database operations. Taking full advantage of its power requires an in-depth understanding of the language. In this course, you learn to use the full potential of SQL to write simple queries for SQL Server databases. You will gain the practical skills to choose the best query method to ensure accuracy and avoid common errors or pitfalls.