So i have this result row from a query with GROUP_CONCAT:
clients, employees, employees, providers, providers
And i wanna get something like this:
clients, employees, providers
Please, i'm new here and i need your help, be pacient if the question is not well formed
Use the DISTINCT option in GROUP_CONCAT()
SELECT GROUP_CONCAT(DISTINCT columnname), ...
Source: http://php.net/manual/en/function.array-unique.php
array_unique — Removes duplicate values from an array
array array_unique ( array $array [, int $sort_flags = SORT_STRING ] )
maybe this is what you need:
$row = array_unique($row);
Edit: If I am not mistaken, sql returns the results as a key value array, so I think this is what you want.
Edit2: Do this:
$row = explode(",", $response);
$row = array_unique($row);
Related
I need to filter duplicates, but union is displaying duplicates.
For example Query-1 is displaying 5 tuples like 1,2,3,4,5.
Query-2 generating 3 tuples like 1,2,6.
Union of both the tuples displaying result 1,2,3,4,5,1,2,6.
But I want the result as 1,2,3,4,5,6.
Here is my controller :
public function product()
{
$product = $this->input->post('keyword');
$temp = explode(" ", $product);
$count = count($temp);
for($i=0;$i<$count;$i++)
{
$query = "SELECT * FROM `product` WHERE SOUNDEX(`name`) LIKE CONCAT('%',SOUNDEX('$temp[$i]'),'%') UNION SELECT * FROM `product` WHERE `name` like '%$temp[$i]%'";
$data = $this->Back_model->getby_query($query);
$records = json_encode($data);
echo $records;
}
}
There is no apparent reason for using 2 select queries, the second filter may be added to an existing where clause
SELECT *
FROM `product`
WHERE SOUNDEX(`name`) LIKE CONCAT('%',SOUNDEX('$temp[$i]'),'%')
AND `name` like '%$temp[$i]%'";
First of all, I would probably do this in another scripting language, but if you really want to do this in MySQL, you need to use DISTINCT. You should query the data and put it in a temp table, and from the temp table query the DISTINCT values. Once you're done you can drop the temp table. For an operation this small, not sure if this is what I would do, but if you say that you have thousands of records/values that need to be filtered, than it might be worth it.
is it possible to get the columns names resulting by a query?
So (for example) if I have this query:
SELECT Id AS IdNumber,
(SELECT COUNT(*) FROM tab2 WHERE IdRif = T1.Id) AS TotCount
FROM tab1 T1
I'd like to get:
IdNumber
TotCount
I saw MySQL query to get column names? (and also other questions) but I wasn't able to use it for what I need.
If your query returns results just use the object(fetch_object) / array (fetch_assoc) from the row and use array_keys($row)
if no rows are returned use http://php.net/manual/en/mysqli-result.fetch-field-direct.php
$result = $db->query($sql);
$i = 0;
while ($i < $db->field_count) {
$info = $result->fetch_field_direct($i++);
echo $info->name;
}
as an example
You can fetch the query result into an Associative Array using mysql_fetch_array($result,MYSQL_ASSOC) or $result->fetch_array(MYSQLI_ASSOC) or whatever method you are using, so that the Key=>Value pair of your Associative Array would be your ColumnName=>ColumnValue.
So, irrespective of whether you are using mysql or mysqli, you would be using the same logic to get the column names.
[major edit to make things clear]
I want to write a query that returns a dynamic column name like this:
SELECT
f2 AS
(
SELECT column_name
FROM column_names_tbl
WHERE column_name = "experience"
limit 0,1
)
FROM some_table
so that would output the same as this:
SELECT
f2 AS experience
FROM some_table
This is no correct SQL syntax, even because the two queries (the selected field and it's alias) are both subqueries and unrelated to each other. So, there's also no possibility for mysql to distinguish what name you want to connect to what value, even if the syntax was correct...
You already use a more or less normalized relational table, so I suggest the following solution:
you select the revision ID and name in a separate query; store them in PHP and use them for whatever you want
next, you evaluate the following query into a separated result set: SELECT ps.keyname, psv.keyvalue FROM page_setting_values AS psv INNER JOIN page_settings AS ps ON ps.id = psv.setting_id WHERE psv.page_revision_id = :revision with :revision representing your revision id
you may now assemble an associated array from that result set:
$settings = [];
$result = $db->executeQuery('...')->fetchAll();
foreach($result as $setting)
{
$settings[$setting['keyname']] = $setting['keyvalue'];
}
Hope that helps ;)
$test = array(10,20);
$rez = $this->Schimb->query("SELECT `pret`,`valuta` FROM schimb ORDER BY pret*{$test['valuta']} DESC");
I can't insert values from an array into MySQL Query...where is the problem?
The problem might be that you are trying to use your regular array as an associative array (indexed by a string key in this case). Try to use the array position as key instead.
$test[0], $test[1] etc...
Example:
$rez = $this->Schimb->query("SELECT `pret`,`valuta` FROM schimb ORDER BY pret{$test[0]} DESC");
But could it be the case that you should only ORDER BY the column pret instead?
I need to return a single row with some datas taken from some tables not related each others.
So, for example, my actual queries are these (I done it trought a PHP script) :
$query=mysql_query("SELECT trackid FROM tracklist WHERE usersub='".$_SESSION['nickname']."'",$mydb);
echo mysql_num_rows($query);
$query=mysql_query("SELECT trackid FROM comments WHERE usercom='".$_SESSION['nickname']."'",$mydb);
echo mysql_num_rows($query);
$query=mysql_query("SELECT vote FROM vote WHERE uservote='".$_SESSION['nickname']."'",$mydb);
echo mysql_num_rows($query);
$query = mysql_query("SELECT datereg FROM users WHERE nickname='".$_SESSION['nickname']."'",$mydb);
echo mysql_result($query,0,'datereg');
But this will call the MySql server 4 times.
Whats your suggestion to better this situation?
If the tables are not related then you will have to make 4 seperate calls
If the tables COULD be related by foreign keys then you could join them in some way and possibly cut down your sql calls
Ultimately though if you need all of the data then you'll have to request it from the database
You could use a UNION. And, btw, mysql_result is poor. And FFS don't forget to sanitize your inputs!
<?php
$nickname = mysql_escape_string($_SESSION['nickname']);
$sql = "
SELECT COUNT(trackid) AS n FROM tracklist WHERE usersub='{$nickname}'
UNION
SELECT COUNT(trackid) FROM comments WHERE usercom='{$nickname}'
UNION
SELECT COUNT(vote) FROM vote WHERE uservote='{$nickname}'
UNION
SELECT datereg FROM users WHERE nickname='{$nickname}'
";
$result = mysql_query($sql, $db);
while ($row = mysql_fetch_assoc($result)) {
echo $row['n'];
}
?>
I wouldn't really recommend this as it's a bit of a mess combining "count" values with a date in the same column, but you can do it. It's the direct answer to your question.
Well, you could create a fifth table and use it as an index.
If all the values { trackid, vote, datareg } are integers, the index table could contain three columns - nickname, value, and table. When you add records to one of the other tables, add a corresponding record to the index table.
For example,
INSERT INTO vote (vote, uservote, ...) VALUES (123, 'abc', ...);
INSERT INTO myindex (nickname, nvalue, ntable) VALUES ('abc', 123, 'vote');
(I wouldn't actually store the table name as a string but as a numeric value, but you get the idea)
Then on a query, you just SELECT nvalue, ntable FROM myindex WHERE nickname = 'abc';
You will possibly get more than one row.
I think that this is a lot of work and you are better off sticking with the four original queries.
Have you tried combining the select statement together like
SELECT .. Actually.
Maybe you should normalise your database and set up links between your tables...
Edit :: And i'm not sure how you're preparing yourself against mysql injection, but be careful with where your $_SESSION[] comes from
If all the selects return a single row:
$query=mysql_query("
(SELECT trackid FROM tracklist WHERE usersub='".$_SESSION['nickname']."'") as tracklist,
(SELECT trackid FROM comments WHERE usercom='".$_SESSION['nickname']."'") as trackid,
(SELECT vote FROM vote WHERE uservote='".$_SESSION['nickname']."'") as vote,
(SELECT datereg FROM users WHERE nickname='".$_SESSION['nickname']."'") as datereg
"