天津app制作seo工作怎么样

天津app制作,seo工作怎么样,网站title,网站开发专业简历模板SQL LIKE 操作符LIKE 操作符用于在 WHERE 子句中搜索列中的指定模式。LIKE 操作符是 SQL 中用于在 WHERE 子句中进行模糊查询的关键字#xff0c;它允许我们根据模式匹配来选择数据#xff0c;通常与 % 和 _ 通配符一起使用。SQL LIKE 语法SELECT column1, column2, ... FROM…SQL LIKE 操作符LIKE 操作符用于在 WHERE 子句中搜索列中的指定模式。LIKE操作符是 SQL 中用于在WHERE子句中进行模糊查询的关键字它允许我们根据模式匹配来选择数据通常与%和_通配符一起使用。SQL LIKE 语法SELECT column1, column2, ... FROM table_name WHERE column_name LIKE pattern;参数说明column1, column2, ...要选择的字段名称可以为多个字段。如果不指定字段名称则会选择所有字段。table_name要查询的表名称。column要搜索的字段名称。pattern搜索模式。通配符%匹配任意字符包括零个字符。_匹配单个字符。实例假设我们有一个名为 Products 的表包含以下数据ProductIDProductNameCategory1iPhone 12Electronics2Samsung Galaxy S21Electronics3Dell XPS 13Electronics4Nike Air ZoomFootwear5Adidas UltraboostFootwear6Sony PlayStation 5Electronics使用 % 通配符找出所有以 iPhone 开头的产品SELECT ProductName, Category FROM Products WHERE ProductName LIKE iPhone%;返回以下数据ProductNameCategoryiPhone 12Electronics使用 _ 通配符找出所有产品名称第二个字符为 e 的产品SELECT ProductName, Category FROM Products WHERE ProductName LIKE _e%;返回以下数据ProductNameCategoryDell XPS 13Electronics结合 % 和 _ 通配符找出所有产品名称包含 Zoom 的产品SELECT ProductName, Category FROM Products WHERE ProductName LIKE %Zoom%;返回以下数据ProductNameCategoryNike Air ZoomFootwear演示数据库在本教程中我们将使用 RUNOOB 样本数据库。下面是选自 Websites 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SELECT * FROM Websites; -------------------------------------------------------------- | id | name | url | alexa | country | -------------------------------------------------------------- | 1 | Google | https://www.google.cm/ | 1 | USA | | 2 | 淘宝 | https://www.taobao.com/ | 13 | CN | | 3 | 菜鸟教程 | http://www.runoob.com/ | 5000 | USA | | 4 | 微博 | http://weibo.com/ | 20 | CN | | 5 | Facebook | https://www.facebook.com/ | 3 | USA | | 7 | stackoverflow | http://stackoverflow.com/ | 0 | IND | --------------------------------------------------------------SQL LIKE 操作符实例下面的 SQL 语句选取 name 以字母 G 开始的所有客户实例SELECT * FROM WebsitesWHERE name LIKE G%;执行输出结果提示% 符号用于在模式的前后定义通配符默认字母。您将在下一章中学习更多有关通配符的知识。下面的 SQL 语句选取 name 以字母 k 结尾的所有客户实例SELECT * FROM WebsitesWHERE name LIKE %k;执行输出结果下面的 SQL 语句选取 name 包含模式 oo 的所有客户实例SELECT * FROM WebsitesWHERE name LIKE %oo%;执行输出结果通过使用 NOT 关键字您可以选取不匹配模式的记录。下面的 SQL 语句选取 name 不包含模式 oo 的所有客户实例SELECT * FROM WebsitesWHERE name NOT LIKE %oo%;