SELECT language FROM ( SELECT language FROM programming_languages WHERE language IN ('MySQL', 'PHP') ) AS subquery; 在上面的示例中,我们首先在子查询中选择了语言为MySQL和PHP的记录,然后将子查询作为一个临时表(使用AS关键字指定别名为subquery)进行查询,最终返回了MySQL
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从数据库表中选取数据 SELECT 语句用于从数据库中选取数据。 语法 SELECT column_name(s) FROM table_name 注释:SQL 语句对大小写不敏感。SELECT 与 select 等效。 为了让 PHP 执行上面的语句,我们必须使用 mysql_query() 函数。该函数用于向 MySQL 发送查询或命令。 例子 下面的例子选取存储在 "Persons" 表中...
$con=mysqli_connect("example.com","peter","abc123","my_db"); // Check connection if (mysqli_connect_errno()) { echo "Failed to connect to MySQL: " . mysqli_connect_error(); } $result = mysqli_query($con,"SELECT * FROM Persons WHERE FirstName='Peter'"); while($row = mysql...
("localhost","root","123456","RUNOOB");if(mysqli_connect_errno($con)){echo"连接 MySQL 失败:".mysqli_connect_error();}//...查询 "RUNOOB" 数据库的一些 PHP 代码...//修改数据库为 "test"mysqli_select_db($con,"test");//...查询 "test" 数据库的一些 PHP 代码...mysqli_close($...
1. 使用原生的SQL语句:可以直接使用SQL语句进行数据库查询操作,如SELECT、INSERT、UPDATE和DELETE等。 “`php $query = “SELECT * FROM table_name WHERE condition”; $result = mysqli_query($conn, $query); “` 2. 使用预处理语句:预处理语句可以防止SQL注入攻击,并且更加安全,可以使用`mysqli`或`PDO`...
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问用于php/mysql的select中的case语句EN1. 列的别名 as:全称：alias(别名),可以省略 列的别名可以使用...
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