php searching in more than one column mysql - php

Question

I am trying to make a code to search for data in more than one column , the code works only if I search in one column. when I tried to search in two columns it says that nothing is found in the database.
<form action="" method="post">
<input type="text" name="param" >
<input type="submit" name="submit" value="search">
</form>
if (isset($_POST['param'])) {
$param= trim ($_POST['param']);
$result = "SELECT * FROM table WHERE student_Name LIKE '%$param%' AND course_name LIKE '%$param%'";

Answer 1

I think you should use OR unless you want to check the 2 columns with the same parameter.
$result = "SELECT * FROM thecars WHERE student_Name LIKE '%$param%' OR course_name LIKE '%$param%'";
Also, this is very open to SQL injection. Sanitize your input before you pass it to the query.

Answer 2

You could do a concat and search via that.
$result = "SELECT * FROM thecars WHERE CONCAT(`student_Name`, `course_name`) AS `search`LIKE '%$param%'";

Answer 3

Your using the same $param variable to search on both columns. If your searching for 2 separate values provide a form that supports inputting 2 values. And then handle such input properly in your query formation.
<form action="" method="post">
<input type="text" name="param1" >
<input type="text" name="param2" >
<input type="submit" name="submit" value="search">
</form>
if (isset($_POST['param1']) || isset($_POST['param2'])) {
$param1 = trim ($_POST['param1']);
$param2 = trim ($_POST['param2']);
$result = "SELECT * FROM thecars WHERE student_Name LIKE '%$param1%' AND course_name LIKE '%$param2%'";
Also change your column aggregation in where clause to OR as suggested by others if your searching for similar outcome.