从两个MySQL表创建一个过滤的数组

Question

Here's the situation.

I have two table in a DB: tblcustomfieldsvalues (for custom fields entry) and tblclients (contains client list).

tblcustomfieldsvalues has following data structure:

id => 10 relid => 13 data => somedataentry

id => 10 relid => 21 data => someotherdataentry

tblclients has following data structure:

id => 13 firstname => somename lastname => somelastname

I have this code to create an array of relids which have id = 10:

$sql = mysqli_fetch_array(mysqli_query("SELECT * FROM `tblcustomfieldsvalues` WHERE `id` = '10'"));

$cids = array();

while ($row = $sql)
{
    array_push($cids, $row['relid']);
}

Now that I have user IDs of those who have filled their custom fields with some data in the $cids array, how can I get those users details from tblclients ?

Thanks in advance.

Answer 1

$sql = mysqli_fetch_array(mysqli_query("SELECT * FROM `tblcustomfieldsvalues` WHERE `id` = '10'"));

$cids = array();

while ($row = $sql)
{
    //array_push($cids, $row['relid']);
    $sql1 = mysqli_fetch_array(mysqli_query("SELECT * FROM `tblclients ` WHERE `id` = '$row['relid']'"));
    while ($row1 = $sql1)
    {
          //echo your output
    }
}

OR

 SELECT * FROM
 tblcustomfieldsvalues cv,tblclients c WHERE
 cv.id = 10 and cv.id = c.id

Answer 2

Sounds like you just need to use an INNER JOIN :

SELECT t2.*
FROM tblcustomfieldsvalues t
  INNER JOIN tblclients t2 ON t.relid = t2.id 
WHERE t.ID = 10

Good luck!

Answer 3

Without knowing the table structure of tblclients I can't be sure, but it sounds like instead of doing separate queries and looping you could just use a join:

SELECT
    *
FROM
    tblcustomfieldsvalues
    NATURAL JOIN tblclients
WHERE
    id = 10