ORDER BY在WHERE之后的用法

Question

我想在WHERE子句之后使用ORDER BY来命令我的结果。

我想是这样的：

$queryl = "select * from logs where pid=".$rowcd['id']. "order by bottom desc"; 

它给了我Fatal error: Call to a member function fetch_assoc()。

没有ORDER BY我的查询工作的罚款：

$queryl = "select * from logs where pid=".$rowcd['id']; 

Answer 1

$queryl = "select * from logs where pid=".$rowcd['id']. " order by bottom desc"; 

前ORDER BY条款双引号和秩序

“为了

Answer 2

放置一个空格后添加一个空格

。

$queryl = "select * from logs where pid = {$rowcd['id']} order by bottom desc"; 

Answer 3

我有时会遇到空间问题。我认为订单关键字之前必须有空格。

$queryl = "select * from logs where pid=".$rowcd['id']. " order by bottom desc";