Php Mysql的select中返回了多少行？

你能告诉我如何计算Mysql的select中返回的行数吗

$n_quakes = "SELECT COUNT(*) 
             FROM earthquakes 
             WHERE milliseconds >= 1000 
               AND milliseconds <= 2000 
               AND magnitude >= 4 
               AND magnitude <= 8 
               AND ipocentro >= 50 
               AND ipocentro <= 800 
               AND latitude >= 40 
               AND latitude <= 50 
               AND longitude >= 30 
               AND longitude <= 70";

$n\u地震=“选择计数（*）
来自地震
其中毫秒>=1000
毫秒=4
震级=50
iposentro=40
纬度=30
和经度尝试使用between

$count = mysqli_fetch_array(mysqli_query($coni, "SELECT COUNT(*) as totalCount
             FROM earthquakes 
             WHERE (milliseconds between 1000 and 2000) and (magnitude between 4 and 8) AND (ipocentro between 50 and 800) AND (latitude between 40 and 50) and (longitude between 30 and 70)"));

$actualCount =  $count['totalCount'];

使用between试试这个

$count = mysqli_fetch_array(mysqli_query($coni, "SELECT COUNT(*) as totalCount
             FROM earthquakes 
             WHERE (milliseconds between 1000 and 2000) and (magnitude between 4 and 8) AND (ipocentro between 50 and 800) AND (latitude between 40 and 50) and (longitude between 30 and 70)"));

$actualCount =  $count['totalCount'];

试试这段代码，其中mysqli_num_rows返回行数，$con是数据库连接变量

$n_quakes = mysqli_num_rows(mysqli_query($con, "SELECT id FROM earthquakes WHERE milliseconds >= 1000 AND milliseconds <= 2000 AND magnitude >= 4 AND magnitude <= 8 AND ipocentro >= 50 AND ipocentro <= 800 AND latitude >= 40 AND latitude <= 50 AND longitude >= 30 AND longitude <= 70"));

$n_quakes=mysqli_num_rows（mysqli_query（$con），“从地震中选择id，其中毫秒>=1000，毫秒=4，震级=50，ipocentro=40，纬度=30，经度试试这段代码，其中mysqli_num_rows返回行数，$con是数据库连接变量

$n_quakes = mysqli_num_rows(mysqli_query($con, "SELECT id FROM earthquakes WHERE milliseconds >= 1000 AND milliseconds <= 2000 AND magnitude >= 4 AND magnitude <= 8 AND ipocentro >= 50 AND ipocentro <= 800 AND latitude >= 40 AND latitude <= 50 AND longitude >= 30 AND longitude <= 70"));

$n_quakes=mysqli_num_rows（mysqli_query（$con，“从地震中选择id，其中毫秒>=1000，毫秒=4，震级=50，ipocentro=40，纬度=30，经度）。如何执行此查询并返回结果？显示代码的所有相关部分。”或者位于代码的其他位置“-我们无法判断，因为我们没有看到任何其他代码。旁注：请查看运算符，这将使您的查询更简单、更短。行数取决于表中的记录数和您应用的条件。作为地震cnt的
SELECT COUNT（*）将使获取值更容易。”。（如果遵循通用命名，则位于
$row['cnt']
中）如何执行此查询并返回结果..？显示代码的所有相关部分。“或位于代码的其他位置”-我们看不出，因为我们没有看到任何其他代码。旁注：请查看运算符，这将使您的查询更简单、更短。行数取决于表中的记录数和您应用的条件。作为地震cnt的
SELECT COUNT（*）将使获取值更容易。（如果遵循通用命名，则它位于
$row['cnt']
中）