我应该在哪里放置WHERE子句

Question

我应该在哪里放置WHERE子句。

$sql=("SELECT * FROM students LIMIT $startResults, $resultsPerPage"); 

Answer 1

尝试，

$sql=("SELECT * FROM students WHERE <where_condition> LIMIT $startResults, $resultsPerPage"); 

Answer 2

应该是这样的：

$sql=("SELECT * FROM students WHERE (condition) LIMIT $startResults, $resultsPerPage"); 

Answer 3

...您的问题是一种模糊的，但....

通常人们做出查询单个字符串，如果我猜你正在问什么：

$sql="SELECT * FROM students WHERE `mysql_field`='$somevalue' LIMIT $number_of_results_you_want_returned"; 

记住上面的查询并不妨碍对SQL injextion攻击裸...

Answer 4

SELECT * FROM students WHERE character='willing to learn' AND Age < 35 LIMIT $startResults, $resultsPerPage 

WHERE和（如有必要）插入AND