mysql_query使用OR从多个列中选择

Question

I have:

$sql = mysql_query("select * from articles where articletitle OR articledescription OR articletags like '%$term%'");

and it returns no results.

Am I using OR incorrectly here?

Thanks

Answer 1

您将需要在所有三个子句中添加LIKE：

SELECT * FROM articles WHERE (articletitle LIKE '%$term%') OR (articledescription LIKE '%$term%') OR (articletags LIKE '%$term%');

Answer 2

Nope.. you need to use the like '...' everytime

$sql = mysql_query("select * from articles where articletitle like '%$term%' OR 
articledescription like '%$term%' OR articletags like '%$term%'");

Answer 3

Yes. :-) You're using it incorrectly.

select * from articles where (articletitle like '%$term%') 
OR (articledescription like '%$term%') OR (articletags like '%$term%')

Answer 4

On a side comment, what would happen if $term is exactly (minus double quotes) "';DELETE FROM articles;-- "? (Add a closing paren after the single quote if your original query had such.) I recommend you rely on some sprintf-like facility (in PHP it often means you'll need prepared statements) rather than the deprecated misfeature known as magic quotes.