delete from user where sno = 1 Fatal error: Uncaught Error: Call to undefined function mysql_query() in D:\apache3\apache3\Apache24\htdocs\baoxian\reduce_user.php:8 Stack trace: #0 {main} thrown in D:\apache3\apache3\Apache24\htdocs\baoxian\reduce_user.php on line 8

这是一个 PHP 致命错误，意味着在执行删除命令时发生了问题。出现错误的代码是在 reduce_user.php 文件的第 8 行，因为调用了一个未定义的函数 mysql_query()。可能是因为该函数已被弃用或者未正确加载所致。

相关问题

delete from product where sno = 1 Warning: Undefined variable $cno in D:\apache3\apache3\Apache24\htdocs\baoxian\reduce_product.php on line 8 Fatal error: Uncaught TypeError: mysqli_query(): Argument #1 ($mysql) must be of type mysqli, null given in D:\apache3\apache3\Apache24\htdocs\baoxian\reduce_product.php:8 Stack trace: #0 D:\apache3\apache3\Apache24\htdocs\baoxian\reduce_product.php(8): mysqli_query(NULL, 'delete from pro...') #1 {main} thrown in D:\apache3\apache3\Apache24\htdocs\baoxian\reduce_product.php on line 8

mysqli_query() 不能为空，必须指定一个有效的 mysqli 连接信息。在 D:\apache3\apache3\Apache24\htdocs\baoxian\reduce_product.php 的第8行发生了未定义变量 $cno 的警告。

delete from `order` where sno = 2 Warning: Undefined variable $cno in D:\apache3\apache3\Apache24\htdocs\baoxian\reduce_order.php on line 8 Fatal error: Uncaught TypeError: mysqli_query(): Argument #1 ($mysql) must be of type mysqli, null given in D:\apache3\apache3\Apache24\htdocs\baoxian\reduce_order.php:8 Stack trace: #0 D:\apache3\apache3\Apache24\htdocs\baoxian\reduce_order.php(8): mysqli_query(NULL, 'delete from `or...') #1 {main} thrown in D:\apache3\apache3\Apache24\htdocs\baoxian\reduce_order.php on line 8

这是一个PHP代码中的错误信息，大致意思是：

在执行SQL语句时，出现了一些错误。具体来说，数据库中的“order”表中的“sno”为2的记录将被删除。但是在代码的第8行，变量“$cno”未被定义，导致程序出现错误。最终出现了“致命错误”，可能是因为mysqli_query函数的参数不正确导致的。