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所在平台: Udemy |
课程主页: https://www.udemy.com/course/sql-joins/
课程评论：没有评论
**课程名称：** Byte-Sized-Chunks: SQL Joins in MySQL **课程概述：** 本课程是“从零到一：SQL与数据库”课程的精简版。许多人在编写SQL查询时，习惯性地复制粘贴他人的代码，而未能真正理解其底层逻辑。这常常导致在修改查询时感到困惑，甚至在查询失败或返回意外结果时束手无策。 JOIN操作是SQL中最强大和最有用的查询类型之一，它如同粘合剂，将数据库中的不同表连接起来，实现数据的关联。一旦我们真正理解了JOIN的原理，即使是复杂的查询也变得易于理解。 本课程将专注于SQL中的JOIN操作，并使用MySQL作为示例来深入讲解理论知识。课程内容将涵盖： * **内连接 (INNER JOIN)** * **外连接 (OUTER JOIN)** (包括左连接和右连接) * **交叉连接 (CROSS JOIN)** * **自然连接 (NATURAL JOIN)** * **左连接 (LEFT JOIN)** * **右连接 (RIGHT JOIN)** 通过MySQL示例，学员将能够扎实掌握JOIN操作的核心概念，从而更自信地编写和优化SQL查询。
Note: This course is a subset of our much longer course 'From 0 to 1: SQL and Databases' so please don't sign up for both:-) All too often, we write queries by copy-pasting from other queries that some friend or colleague copy-pasted from somewhere. We often don't appreciate the nitty-gritty, and are left with vaguely uncomfortable each time we try to change our query - and clueless when our queries don't run, or when they return unexpected results. Joins are probably the most useful type of queries out there. They are the glue that bind together tables in a database, that connect the dots. Once we understand - really understand - joins, even very complex queries start to make sense. And that's why this course is all about joins, with examples in MySQL to drive home the theory. Inner joinsOuter joinsCross joinsNatural joinsLeft and right joinsWrap up all of this with examples in MySQL!
