SQL基础教程进阶的相关内容

文章 2023-02-25 来自：开发者社区

yyds，SQL基础教程，进阶必须(建议收藏！) 下

原始的表 (用在例子中的)：Orders 表:CompanyOrderNumberIBM3532W3School2356Apple4698W3School6953实例 1以字母顺序显示公司名称：SELECT Company, OrderNumber FROM Orders ORDER BY Company结果：CompanyOrderNumberApple4698IBM3532W3School.....

文章 2023-02-24 来自：开发者社区

yyds，SQL基础教程，进阶必须(建议收藏！) 中

WHERE 子句如需有条件地从表中选取数据，可将 WHERE 子句添加到 SELECT 语句。语法SELECT 列名称 FROM 表名称 WHERE 列运算符值下面的运算符可在 WHERE 子句中使用：注释：在某些版本的 SQL 中，操作符 <> 可以写为 !=。使用 WHERE 子句如果只希望选取居住在城市 "Beijing" 中的人，我们需要向 SELECT 语句添加 WHE....

文章 2023-02-24 来自：开发者社区

yyds，SQL基础教程，进阶必须(建议收藏！) 上

SQL 简介 SQL 是用于访问和处理数据库的标准的计算机语言。什么是 SQL？SQL 指结构化查询语言SQL 使我们有能力访问数据库SQL 是一种 ANSI 的标准计算机语言编者注：ANSI，美国国家标准化组织SQL 能做什么？SQL 面向数据库执行查询SQL 可从数据库取回数据SQL 可在数据库中插入新的记录SQL 可更新数据库中的数据S....

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更新时间 2023-04-23 15:30:38

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