如何从2个查询中获得结果

Question

I have a script that searches for users in the db. I have two input fields so that I can search for eg city and house number. What I want is that if I type eg London in the city field and the number 20 it returns the record with London AND 20 in it. I'm not quite sure how to achieve this. I did enough research on Google but still didn't find the answer.

Here is my code:

if($_GET['search'] != ''){
$result = mysql_query("SELECT * FROM klant WHERE klant_id LIKE '%" .$search."%' OR             voornaam LIKE '%" .$search."%' OR achternaam LIKE '%" .$search."%' OR email LIKE '%"        .$search."%' OR plaats LIKE '%" .$search."%' OR bedrijfsnaam LIKE '%" .$search."%'ORDER BY       klant_id DESC");


$result2 = mysql_query("SELECT * FROM klant WHERE klant_id LIKE '%" .$search2."%' OR voornaam   LIKE '%" .$search2."%' OR achternaam LIKE '%" .$search2."%' OR email LIKE '%" .$search2."%' OR   plaats LIKE '%" .$search2."%' OR bedrijfsnaam LIKE '%" .$search2."%'ORDER BY klant_id DESC");
$i = 0;

}

What I need is something that will give the proper $result where those two search values ($search and $search2) are combined. Thus allowing me to search much easier.

Hope that i phrased my question well enough for you to understand me and I hope that you can help me!

Answer 1

好吧，如果你想运行2个查询并得到1个结果集，你应该看一个UNION查询

Answer 2

The words "UNION" (for only distinct values) or "UNION ALL" (to allow repeats) between your two queries will join them into one results table.

But when it comes to searches, I highly recommend against using %word%. It'll slow your search down tremendously once you have a lot of data because SQL will iterate through the length of entire strings to find anything that contains the word in question.

Answer 3

Please try with the following logic -

if($_GET['search'] != ''){
$search = $_GET['search'];
$where[] = "( klant_id LIKE '%" .$search."%' OR  voornaam LIKE '%" .$search."%' OR achternaam LIKE '%" .$search."%' OR email LIKE '%"        .$search."%' OR plaats LIKE '%" .$search."%' OR bedrijfsnaam LIKE '%" .$search."%' ) ";
}
if($_GET['search2'] != ''){
$search2 = $_GET['search2'];
$where[] = " ( klant_id LIKE '%" .$search2."%' OR voornaam   LIKE '%" .$search2."%' OR achternaam LIKE '%" .$search2."%' OR email LIKE '%" .$search2."%' OR   plaats LIKE '%" .$search2."%' OR bedrijfsnaam LIKE '%" .$search2."%') ";
}
$query_where = (is_array($where))?" WHERE ".implode(" AND ", $where):""; 
$result = mysql_query("SELECT * FROM klant ".$query_where." ORDER BY klant_id DESC");

Answer 4

您可以使用UNION子句例如： First Query .. UNION Second Query .. :)

Answer 5

I believe you could use another OR operator with brackets:

$result = mysql_query("
    SELECT 
        * 
    FROM 
        klant 
    WHERE 
        (klant_id LIKE '%" .$search."%' OR 
        voornaam LIKE '%" .$search."%' OR 
        achternaam LIKE '%" .$search."%' OR 
        email LIKE '%".$search."%' OR 
        plaats LIKE '%" .$search."%' OR 
        bedrijfsnaam LIKE '%" .$search."%') 
    OR 
        (klant_id LIKE '%" .$search2."%' OR 
        voornaam   LIKE '%" .$search2."%' OR 
        achternaam LIKE '%" .$search2."%' OR 
        email LIKE '%" .$search2."%' OR 
        plaats LIKE '%" .$search2."%' OR 
        bedrijfsnaam LIKE '%" .$search2."%') 
    GROUP BY 
        klant_id
    ORDER BY
        klant_id DESC");

But UNION might look cleaner as the other answers suggest.

Added group by to prevent the same result from displaying multiple times.

Answer 6

if($_GET['search'] != ''){

$query1 = "SELECT * FROM klant WHERE klant_id LIKE '%" .$search."%' OR voornaam LIKE '%" .$search."%' OR achternaam LIKE '%" .$search."%' OR email LIKE '%".$search."%' OR plaats LIKE '%" .$search."%' OR bedrijfsnaam LIKE '%" .$search."%'ORDER BY klant_id DESC";

$query2 = "SELECT * FROM klant WHERE klant_id LIKE '%" .$search2."%' OR voornaam   LIKE '%" .$search2."%' OR achternaam LIKE '%" .$search2."%' OR email LIKE '%" .$search2."%' OR plaats LIKE '%" .$search2."%' OR bedrijfsnaam LIKE '%" .$search2."%'ORDER BY klant_id DESC";

$result = mysql_query($query1 . ' UNION ALL ' . $query2;
$i = 0;

}