I have been trying to show rows without duplicates but the query isn't working properly. I think the problem is one to many relationship, because one 'intervaloHorario' has many 'citas'. So, for example, i want to show only: 'From 8:00 to 15:00 (this is an intervaloHorario)' to date (cita) '27/08/1988'. What should i do?
Controller
$this->Fechacita_Model->delete_duplicaterow();
Model
public function delete_duplicaterow() {
$this->db->select('
c.intervaloHorario','ci.cita'
);
$this->db->from('intervaloshorarios c');
$this->db->join('citas ci', 'ci.idCitas = c.idIntervaloHorario','left');
$this->db->group_by('c.idIntervaloHorario','ci.cita');
$query = $this->db->get();
return $query->num_rows();
}
Model(EDIT)
$this->db->select(array('c.intervaloHorario', 'ci.cita'));
$this->db->distinct();
$this->db->from('intervaloshorarios c');
$this->db->join('citas ci', 'ci.idCitas = c.idIntervaloHorario', 'left');
$this->db->group_by('c.idIntervaloHorario', 'ci.cita');
$query = $this->db->get();
$this->db->last_query();
return $query->num_rows();
Database
Current database
Screenshot
Current list (unordered list but duplicates persists)
You can use $this->db->distinct() and add selecting primary key to remove duplicate:
public function delete_duplicaterow() {
$this->db->select(array('c.intervaloHorario', 'ci.cita'));
$this->db->distinct();
$this->db->from('intervaloshorarios c');
$this->db->join('citas ci', 'ci.idCitas = c.idIntervaloHorario','left');
$this->db->group_by('c.idIntervaloHorario','ci.cita');
$query = $this->db->get();
return $query->num_rows();
}
Use the keyword DISTINCT in your query
reference : https://dev.mysql.com/doc/refman/5.7/en/distinct-optimization.html
Related
code:
public function draft_post($idd)
{
$this->db->select('*');
$this->db->from('registration');
$this->db->join('draft_registration', 'registration.user_id= draft_registration.user_id','INNER');
$this->db->where('registration.user_id', $idd);
$query = $this->db->get();
$result = $query->result_array();
return $result;
}
In this codes, I have two table i.e. registration and draft_registration. Now, What am I doing here I want to run inner join in Codeigniter. Now, What happening when I hit this query on phpmyadmin it shows wrong data i.e. I have two rows in draft_registration and one row in registration table but it always shows two table which is wrong and my query looks like when I was print as mention below:
SELECT *
FROM `registration`
INNER JOIN `draft_registration` ON `registration`.`user_id`= `draft_registration`.`user_id`
WHERE `registration`.`user_id` = '20181121064044'
So, How can I resolve this issue? Please help me.
Thank You
$this->db->select('*'); //This code get all rows from both table.If you want a particular row you mention the column name.
For example:
$this->db->select('registration.name,draft_registration.city,draft_registration.state');
Specify column that you want to select. Or if you want select all column of your table, you can use :
SELECT registration.* with backticks `` on column name
Use the Below Code
public function draft_post($idd)
{
$this->db->select('registration.*,draft_registration.*');
$this->db->from('registration');
$this->db->join('draft_registration', 'registration.user_id= draft_registration.user_id');
$this->db->where('registration.user_id', $idd);
$query = $this->db->get();
$result = $query->result_array();
return $result;
}
Or you can use with objects
public function draft_post($idd)
{
$this->db->select('a.*,b.*');
$this->db->from('registration a');
$this->db->join('draft_registration b', 'a.user_id= b.user_id');
$this->db->where('a.user_id', $idd);
$query = $this->db->get();
$result = $query->result_array();
return $result;
}
i am trying to fetch records that have unique email address ( there are repeating emails as well in the database)
below is my query but it prints all the records
$this->db->distinct('email');
$this->db->select('*');
$this->db->from('booking');
$query = $this->db->get();
$data['booking']=$query->result();
Please help me to fix the issue . Thanks
You can achieve your results in two ways: distinct and group_by
For reference, please view here
$this->db->select('*');
$this->db->from('booking');
$this->db->distinct('email');
$query = $this->db->get();
return $query->result();
You can use group_by as alternatives way in your active record query.
$this->db->select('*');
$this->db->group_by('email');// add group_by
$query = $this->db->get('booking');
return $query->result();
do it like this...
$this->db->select('*');
$this->db->from('booking');
$this->db->group_by('email');
$query = $this->db->get();
$data['booking']=$query->result();
it will echo all unique email addresses except those duplicated email.
I am using multiple joins but got stuck in this. I am using join of 3 tables but it fetches values of only 2 tables not 3rd one. Here my model query is:
public function seller_products()
{
$this->db->select('*')->select('wc_seller_products.id')->from('wc_seller_products')
->join('wc_seller', 'wc_seller.id = wc_seller_products.seller_id', 'LEFT')
->join('wc_seller_info', 'wc_seller_info.id = wc_seller_products.seller_id', 'LEFT');
$query = $this->db->get();
return $query;
}
It doesn't fetch values of wc_seller table .... please help
public function seller_products()
{
$this->db->select('wc_seller_products.*,wc_seller.*,wc_seller_info.*');
$this->db->from('wc_seller_products');
$this->db->join('wc_seller', 'wc_seller.id = wc_seller_products.seller_id');
$this->db->join('wc_seller_info', 'wc_seller_info.id = wc_seller_products.seller_id');
$query = $this->db->get();
return $query;
}
I'am using CodeIgniter active records and I have a lack in knowledge of Joining multiple table columns in MySQL.
What I basically want to do, is to output all rows from a ci_categories table, but instead of showing ci_categories.component_id as a numeric, i wish to output the ci_components.name which have equal (or same) ci_components.id from another table ci_components by using the Active Records in CodeIgniter.
What I have already done, but with errors is:
Model:
public function getItemName($id){
$this->db->select('*');
$this->db->where('id', $id);
$result = $query->result();
return $result;
}
and View:
<?php echo $this->component_model->getItemName($cat['category']->com_id);?>
Any tips pls ?
$this->db->select('name')
->from('ci_components')
->where('ci_categories.component_id = ci_componenents.id');
$query = $this->db->get();
or
$this->db->select('name');
$this->db->from('ci_components');
$this->db->join('ci_categories', 'categories.component_id = ci_components.id');
$query = $this->db->get();
https://www.codeigniter.com/userguide2/database/active_record.html#select
I try this code
function catstore($id)
{
$this->db->distinct();
$this->db->select('store_id');
$this->db->from('products');
//$this->db->join('products','products.store_id = products.store_id');
$this->db->where('cat_id', $id);
$result = $this->db->get();
return $result->result();
}
it produces only the distinct store_id but i want all column of the table with distinct rows based on store_id
Suggest me any option
Thanks in advance
You can try using group_by
function catstore($id)
{
$this->db->select('*');
$this->db->from('products');
//$this->db->join('products','products.store_id = products.store_id');
$this->db->where('cat_id', $id);
$this->db->group_by('store_id');
$result = $this->db->get();
return $result->result();
}
I know this question is already long time ago, but one may be looking for the same problem like me, and this is how I solved it.
you can omit the select function altogether. If you are selecting all (*) from a table you do not need to use this function. When omitted, CodeIgniter assumes you wish to SELECT *
See http://codeigniter.com/user_guide/database/active_record.html#select
Or..
You can pass comma separated values to select function. So pass all column names separated by comma that you want to select
function catstore($id)
{
$this->db->distinct();
$this->db->select('store_id, column1, column2, cloumn3');
$this->db->from('products');
//$this->db->join('products','products.store_id = products.store_id');
$this->db->where('cat_id', $id);
$result = $this->db->get();
return $result->result();
}