我應該在哪裏放置WHERE子句

Question

我應該在哪裏放置WHERE子句。

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

Answer 1

嘗試，

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

Answer 2

應該是這樣的：

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

Answer 3

...您的問題是一種模糊的，但....

通常人們做出查詢單個字符串，如果我猜你正在問什麼：

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

記住上面的查詢並不妨礙對SQL injextion攻擊裸...

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