Get maximum value of row in mysql using codeigniter.
i have following mysql data
I need to get the details based on total_payment of each student.
like this
i tried code below
$student_id_dis = $this->db->query('SELECT DISTINCT(student_id) FROM student_fees')->result_array();
$fee_cat_id_dis = $this->db->query('SELECT DISTINCT(fee_category_id) FROM student_fees')->result_array();
$this->db->select(['student_fees.*', 'fee_categories.fee_category_name as fee_name', 'fee_categories.amount as fee_amount']);
$this->db->join('student', 'student_fees.student_id = student.student_id');
$this->db->join('fee_categories', 'student_fees.fee_category_id = fee_categories.fee_categories_id');
$where = '';
for ($i = 0; $i < count($student_id_dis); $i++) {
if (isset($fee_cat_id_dis[$i]['fee_category_id'])) {
$where .='total_paid = (SELECT max(stdp.total_paid)
FROM student_fees stdp
WHERE stdp.fee_category_id = ' . $fee_cat_id_dis[$i]['fee_category_id'] . ')';
}
$this->db->where($where);
$this->db->get('student_fees')->result_array();
}
try this
select * from student_fees where student_fees_id in
(select student_fees_id from
where total_paid =max(total_paid) group by fee_category_id)
Related
I have a spatial dataset in MySQL 5.7 where I have the columns: id, deviceid, latlng_point, time. latlng_point is a geospatial Point.
What I'm trying to achieve is calculating distance from points. I'm unsure on how to approach this.
SELECT
ST_DISTANCE_SPHERE(latlng_point, i want the next latlng_point here) AS distance
FROM points
WHERE deviceid = 1
ORDER BY time DESC;
In PHP I would do something like this:
<?php
$conn = new mysqli($host,$user,$pass,$db);
$query = "SELECT latlng_point FROM points WHERE deviceid = 1...";
$latlng_array = array();
if ($result = $conn->query($query)) {
while ($row = $result->fetch_assoc()) {
$latlng_array[] = $row;
}
}
$distance = 0;
for ($i = 0; $i < count($latlng_array) - 1; $i++) {
$pt1 = $latlng_array[$i]['latlng_point'];
$pt2 = $latlng_array[$i+1]['latlng_point'];
$distance += haversine_function($pt1,$pt2);
}
echo "Distance: {$distance}";
?>
I'm trying to achieve something similar purely in MySQL.
Try this one:
SELECT SUM(ST_DISTANCE_SPHERE(p1.latlng_point, p2.latlng_point)) AS total_distance
FROM points p1
JOIN points p2 ON p2.id = (
SELECT p.id
FROM points p
WHERE p.deviceid = p1.deviceid
AND p.time > p1.time
ORDER BY p.time ASC
LIMIT 1
)
WHERE p1.deviceid = 1
The (correlated) subquery should return the id of the next point (sorted by time).
I can't tell you if it is really efficient or if it even works at all (can't test it).
However you should have an index on (deviceid, time) - Assuming that id is the primary key.
$query_sub = "SELECT * FROM `product_mappings` LEFT JOIN `product_list` ON `product_mappings`.ID_PRODUCT =`product_list`.ID WHERE ID_USER='" . $row{'ID'} . "'";
$result_sub = mysql_query($query_sub);
if ($result_sub && mysql_num_rows($result_sub) > 0)
{
$data_products = array();
while ($row_sub = mysql_fetch_array($result_sub))
{
$data_sub = array();
$data_sub["ID"] = $row_sub{'ID'};
$data_sub["product"] = $row_sub{'PRODUCT'};
$query_sub_unactive = "SELECT * FROM `product_list` WHERE ID != '" . $row_sub{'ID'} . "' ";
$result_sub_unactive = mysql_query($query_sub_unactive);
if ($result_sub_unactive && mysql_num_rows($result_sub_unactive) > 0)
{
$data_products_unactive = array();
while ($row_sub_unactive = mysql_fetch_array($result_sub_unactive))
{
$data_sub_unactive = array();
$data_sub_unactive["ID"] = $row_sub_unactive{'ID'};
$data_sub_unactive["productss"] = $row_sub_unactive{'PRODUCT'};
array_push($data_products_unactive, $data_sub_unactive);
}
$data_current["productsUnactive"] = $data_products_unactive;
}
array_push($data_products, $data_sub);
}
$data_current["products"] = $data_products;
Hi guys ! This is query where I should select only products that are not already in main query. I am checking if ID is the same as you can see. For example I load 4 products (of 15) with main query and unactive should load 11 of items in this case.. but loads 14 items.. so it "removes" just one product from list. Any clue?
Thanks !
SELECT * FROM `product_list` WHERE ID != '" . $row_sub{'ID'} . "' ";
This query is checking 1 ID at a time and is always going to return the other 14 rows. What you need is a "NOT IN" query like this:
SELECT * FROM `product_list` WHERE ID NOT IN ("id1","id2","id3","id4");
I'm trying to do a filter search functionality in codeigniter. I have a table named products and my system has the functionality to filter these products by category and by date. I have a mysql code in mind which looks something like this:
SELECT * from products WHERE product_category='Cloth'
INTERSECT
SELECT * from products WHERE ('insert date logic here')
So it should return records (via id) from the same table named products. However, there's no INTERSECT in mysql so I don't know how to do this. Any help would be greatly appreciated!
This is my code just for the part of the product category
$this->db->limit($limit,$start);
$query = $this->db->query('SELECT * from product_advertised WHERE quantity > 0 AND prodcatid='.$prodcats[0].' LIMIT '.$start.','.$limit);
if(sizeof($prodcats > 1)) {
$query_str = "SELECT * FROM product_advertised WHERE quantity>0 AND ";
$str="";
for($i = 0;$i < sizeof($prodcats);$i++) {
if($i != sizeof($prodcats)-1) {
$str = $str. "prodcatid=".$prodcats[$i]." OR ";
}
else {
$str = $str. "prodcatid=".$prodcats[$i]." LIMIT ".$start.",".$limit;
}
}
$query_str .= $str;
$query = $this->db->query($query_str);
}
if($query->num_rows() > 0) {
foreach($query->result() as $row) {
$data[] = $row;
}
return $data;
}
return false;
Why wouldn't you just use and?
SELECT *
from products
WHERE product_category = 'Cloth' AND
('insert date logic here');
I'm trying to sum my MySQL column value with number, here is my php script, i dont think im doing in right way. I was searching in stackoweflow but i havent found how to sum with specific number, not with other column.
<?php
$currentUser = isset($_POST['currentUser']) ? $_POST['currentUser'] : '';
$currentTasken = isset($_POST['currentTasken']) ? $_POST['currentTasken'] : '';
$con = mysql_connect("localhost", "root", "") or die(mysql_error());
if(!$con)
die('Could not connectzzz: ' . mysql_error());
mysql_select_db("foxi" , $con) or die ("could not load the database" . mysql_error());
$check = mysql_query("SELECT * FROM dotp_task_log");
$numrows = mysql_num_rows($check);
if($numrows >= 1)
{
//$pass = md5($pass);
$ins = mysql_query("INSERT INTO dotp_task_log (task_log_creator, task_log_Task) VALUES ('$currentUser' , '$currentTasken')" ) ;
if($ins)
$check = mysql_query("SELECT * FROM dotp_task WHERE task_id='$currentTasken'");
$numrows = mysql_num_rows($check);
if($numrows == 1)
{
//$pass = md5($pass);
$ins = mysql_query("SELECT (SELECT SUM(task_percent_complete) FROM dotp_task WHERE task_id='$currentTasken') FirstSum, (SELECT SUM(5)), SecondSum ");
if($ins)
die("Succesfully summed!");
else
die("ERROR");
}
else
{
die("Cant sum!");
}
die("Succesfully Created Log!");
else
die("ERROR");
}
else
{
die("Log already exists!");
}
?>
Your query is not written properly. Try to run this query from MySQL command line or from PHPMyAdmin. It will give you an idea what the error is. My best guess is that the first part of the query is not complete.
This is what it will resolve to
SELECT n FirstSum, 5, SecondSum
Where n is the value returned from the subquery. This is a syntax error. Try to remove the last comma before SecondSum.
This is what your query should be:
SELECT (SELECT Sum(task_percent_complete)
FROM dotp_task
WHERE task_id = '$currentTasken') FirstSum,
(SELECT Sum(5)) SecondSum
remove
(select sum(5))
and replace it with
(select 5)
I'm trying to figure out how to build a query using Yii's CDbCriteria that would be equivalent to the following:
SELECT
*
FROM
user u
JOIN (
SELECT *
FROM skill_assessment s
WHERE s.skill = 'HTML'
AND s.score >= 80
) b ON
(u.id = b.userId)
JOIN (
SELECT *
FROM skill_assessment s
WHERE s.skill = 'CSS3'
AND s.score >= 80
) c ON
(u.id = c.userId);
etc...
Here's what I have so far, that isn't working:
$criteria = new CDbCriteria();
$criteria->alias = "u";
$criteria->select = "*";
$criteria->join = "JOIN skill_assessment s ON (u.id=s.userId)";
for($i = 0; $i < count($skill_filters); $i++) {
$criteria->addCondition("s.skill='".$skill_filters[$i]->skill."' AND s.score >= ".$skill_filters[$i]->level);
}
$users = UserModel::model()->findAll($criteria);
Any help would be greatly appreciated.
Thanks in advance.
EDIT:
I was able to build out the sql query as a string and use findAllBySql, which returned the correct UserModels that matched my search criteria, the problem is that I haven't been able to get it to return the related SkillAssessmentModels. They don't come back either with the initial query, like this:
$users = UserModel::model()->with('skill_assessments')->findAllBySql($sql);
nor if I get the results like this:
$users = UserModel::model->findAllBySql($sql);
foreach($users as $user)
{
$user->skill_assessments = $user->getRelated('skill_assessments');
}
Any thoughts on how I can get those related models?
The strange thing is that elsewhere in my application, I CAN get the related models if I do this:
$user = UserModel::model->findByPk($id);
$user->skill_assessments->getRelated('skill_assessments');
Second param for addCondition is by default 'AND'. Is this what you are looking for? May be you should define 'OR' for $operator and add braces around condition.
But in your case addCondition will by applied to the user table, not to the JOIN.
I think that this should work for you:
$criteria = new CDbCriteria();
$criteria->alias = "u";
$criteria->together= "skill_assessment";
$where = array();
for($i = 0; $i < count($skill_filters); $i++) {
$where[] = "(s.skill='".$skill_filters[$i]->skill."' AND s.score >= ".$skill_filters[$i]->level . ')';
}
$criteria->join = 'JOIN skill_assessment s ON (u.id=s.userId' . ( $where ? ( ' AND (' . join( ' OR ', $where ) . ')' ) : '') . ')';
$users = UserModel::model()->findAll($criteria);
Fetch _skill_assessment_ like this:
foreach( $users->skill_assessment as $skill_assessment )
{
echo $skill_assessment->userId;
}
At this level keep it simple:
$sql="select * from mytable where id = :id";
$cmd = Yii::app()->db->createCommand($sql)->bindParam("id", $res_id);
$cmd->execute();
Thanks a lot to Boris Belenski!
What you suggested wasn't quite what I needed, but it did get me to what I needed. Here is what I ended up with that works:
$str = "abcdefghijklmnopqrstuvwxyz";
$idxs = str_split($str);
$criteria = new CDbCriteria();
$criteria->alias = "u";
$joins = array();
for($i = 0; $i < count($skill_filters); $i++)
{
$joins[] = " JOIN (SELECT * FROM skill_assessment s WHERE s.skill = '" . $skill_filters[$i]->skill ."' AND s.score >= " . $skill_filters[$i]->level . ") " . $idxs[$i] . " ON (u.id = " . $idxs[$i] . ".userId) ";
}
$criteria->join = join(' ', $joins);
$users = UserModel::model()->findAll($criteria);
foreach($users as $user)
{
$user->skill_assessments = $user->getRelated('skill_assessments');
}
The really key part is that $joins array.
This will allow you to get all the users that match ALL the criteria for row matches in the skill_assessments table.
Also, I could probably lazily load the skill assessments in the View in a normal view, but I need to get all the skill_assessments for each user now in order to pass them back in an ajax response with the user.