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  • Calculating average (AVG) and grouping by week on large data set takes too long

    - by caioiglesias
    I'm getting average prices by week on 7 million rows, it's taking around 30 seconds to get the job done. This is the simple query: SELECT AVG(price) as price, yearWEEK(FROM_UNIXTIME(timelog)) as week from pricehistory where timelog > $range and product_id = $id GROUP BY week The only week that actually gets data changed and is worth averaging every time is always the last one, so this calculation for the whole period is a waste of resources. I just wanted to know if mysql has a tool to help out on this.

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  • Refresh Service List of a paired Bluetooth device !

    - by sas-san
    Hi- Is there any possibility to refresh the service list of a paired device in a programm? At the moment, i have to go to the bluetooth options and select the device properties of the bluetooth device and have to refresh the service list manually. Is there any API that RIMM provides to do programmatically? thanks,

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  • session variable values are not being passed between pages

    - by ravi nankani
    hi, i am a little new to php and although i have managed to pass values of session variables before this piece of code is leaving me puzzled <form action="team_reg2.php" method="post" name="form1" class="cent" id="form1"> Team Registration "; print "member$i"; print "\n"; print "\n"; print "Please enter only id\n"; } ? now this will pass via post to team_reg2.php echo " please note your team id is 1 "; echo " your team members are : "; for($i=1;$i<=$num;$i++) { $name='mem'.$i; echo "$_POST[$name]"; } } else { $str="select * from $query where ("; for($i=1;$i<=$num;$i++) { $name='mem'.$i; $text="p_id='$_POST[$name]'"; if($i==1) $str=$str.$text; else $str=$str.' or '.$text; } $str=$str.')'; $query2=$str; echo "$str"; // echo "$query2"; $que=mysql_query($query2,$con) or die(mysql_error()); $num=mysql_num_rows($que); if($num!=0) { while($result=mysql_fetch_array($que)) { echo "$result[p_id] is already registered in team $result[t_id]"; } //include("reg_team.html"); } else if($num==0) { //echo $query; $query2="select max(t_id) from $query"; $que=mysql_query($query2,$con) or die(mysql_error()); //echo "$que"; $result=mysql_fetch_array($que); $max=$result['max(t_id)']; $max++; $num=$_SESSION['max_team']; for($i=1;$i<=$num;$i++) { $name='mem'.$i; if($_POST[$name]!="") { $query2="insert into $query values($max,'$_POST[$name]')"; $que=mysql_query($query2,$con); } } echo " please note your team id is $max "; echo " your team members are : "; for($i=1;$i<=$num;$i++) { $name='mem'.$i; echo "$_POST[$name]"; } } } ? i have done session_start(); at the beginning of the page itself. The problem is that echoing $_SESSION variables in second file is not printing anything. someone please explain me whats going on. thank you

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  • How to user IN operator in Linq?

    - by Umapathy
    Query: Select * from pu_Products where Part_Number in ('031832','027861', '028020', '033378') and User_Id = 50 and Is_Deleted = 0 The above mentioned query is in SQL and i need the query might be converted into Linq. Is there any option using the "IN" operator in Linq?. can you convert above mentioned query into Linq?

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  • Populating a Combobox inside a Gridview

    - by Nawait
    i'm having a few problems working with a gridview and a combobox inside of it. Here is the code for my ListView control: <ListView Height="139" HorizontalAlignment="Left" Margin="10,158,0,0" Name="lvAppointment" VerticalAlignment="Top" Width="250" MinWidth="350"> <ListView.View> <GridView> <GridViewColumn Header="Appointment" Width="120"> <GridViewColumn.CellTemplate> <DataTemplate> <DatePicker SelectedDate="{Binding Path=Appointment}"/> </DataTemplate> </GridViewColumn.CellTemplate> </GridViewColumn> <GridViewColumn Header="Type" Width="170"> <GridViewColumn.CellTemplate> <DataTemplate> <ComboBox ???/> </DataTemplate> </GridViewColumn.CellTemplate> </GridViewColumn> <GridViewColumn Header="Done" Width="50"> <GridViewColumn.CellTemplate> <DataTemplate> <CheckBox IsChecked="{Binding Path=Done}" IsThreeState="False"/> </DataTemplate> </GridViewColumn.CellTemplate> </GridViewColumn> </GridView> </ListView.View> I'm popluating the list from a sql ce database via c# with the following code using (SqlCeCommand sqlCeAppointment = new SqlCeCommand("SELECT appid,appointment,done,apptype.type FROM appointment INNER JOIN apptype ON appointment.refatid = apptype.atid WHERE refeventid = @eventid;", sqlCeConn)) { sqlCeAppointment.Parameters.AddWithValue("@eventid", ((cListEventItem)lvEvent.SelectedItems[0]).id); using (SqlCeDataReader sqlCeAppointmentReader = sqlCeAppointment.ExecuteReader()) { lvAppointment.Items.Clear(); while (sqlCeAppointmentReader.Read()) { lvAppointment.Items.Add(new cListAppointmentItem { id = sqlCeAppointmentReader.GetGuid(sqlCeTerminReader.GetOrdinal("appid")), Appointment = sqlCeAppointmentReader.GetDateTime(sqlCeTerminReader.GetOrdinal("appointment")), Type = sqlCeAppointmentReader.GetString(sqlCeTerminReader.GetOrdinal("type")), Done = sqlCeAppointmentReader.GetByte(sqlCeTerminReader.GetOrdinal("done")) }); } } } I can popluate the list just fine. But i want "Type" to be a combobox so the user can select the apropriate type of the appointment (its a list of appointments connected to an event). This combobox should be filled with data thats inside a table of the sql ce database (apptype). This table is not static, the users can add and delete items from this list. I have tried a few ways i found via google, but failed. I guess i'm having problems understanding how this works/should work. I hope someone can help me :( Thanks in advance

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  • Conditional sorting in MySQL?

    - by serg555
    I have "tasks" table with 3 fields: date priority (0,1,2) done (0,1) What I am trying to achieve is with the whole table sorted by done flag, tasks that are not done should be sorted by priority, while tasks that are done should be sorted by date: Select * from tasks order by done asc If done=0 additionally order by priority desc If done=1 additionally order by date desc Is it possible to do this in MySQL without unions? Thanks.

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  • Determining an Oracle SQL MERGE statement result

    - by petejamd
    Follow up to this question This (similar version from old link) works in SQL Server 2008, however, Oracle is giving me trouble: MERGE INTO wdm_test USING ( select '10000000000000000000000000000000' Guid from DUAL ) val ON ( wdm_test.Guid = val.Guid ) WHEN MATCHED THEN UPDATE SET test_column = null WHEN NOT MATCHED THEN INSERT (Guid, test_column) VALUES ('10000000000000000000000000000000', null) OUTPUT $action; SQL Error: ORA-00933: SQL command not properly ended Does Oracle not support OUTPUT $action;? If not, is there an alternative?

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  • mysql join table - selecting the newest row

    - by cmancre
    Hi, I have the following two MySQL tables TABLE NAMES NAME_ID NAME 1 name1 2 name2 3 name3 TABLE STATUS STATUS_ID NAME_ID TIMESTAMP 1 1 2010-12-20 12:00 2 2 2010-12-20 10:00 3 3 2010-12-20 10:30 4 3 2010-12-20 14:00 I would like to select all info from table NAMES and add most recent correspondent TIMESTAMP column from table STATUS RESULT NAME_ID NAME TIMESTAMP 1 name1 2010-12-20 12:00 2 name2 2010-12-20 10:00 3 name3 2010-12-20 14:00 Am stuck on this one. How do I left join only on the newer timestamp?

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  • PHP Code Problem...

    - by aamir Fayyaz
    function check_login($array_val) { $strQury = "Select * from tblsignup where usr_email ='".$array_val[0]."' and usr_password = '".$array_val[1]."'" ; $result = mysql_query($strQury); $row_user = mysql_fetch_array($result); if(mysql_num_rows($result)>0) { $msg = "true"; } else { $msg = "false"; } return $msg ; } The return value is Object id #1true???? what is object id#1?

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  • Get previous and next row from current id

    - by Hukr
    How can I do to get the next row in a table? `image_id` int(11) NOT NULL auto_increment `image_title` varchar(255) NOT NULL `image_text` mediumtext NOT NULL `image_date` datetime NOT NULL `image_filename` varchar(255) NOT NULL If the current image is 3 for example and the next one is 7 etc. this won’t work: $query = mysql_query("SELECT * FROM images WHERE image_id = ".intval($_GET['id'])); echo $_GET['id']+1; How should I do? thanks

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  • Convert multiquery to a query using group by and so on

    - by ffffff
    -schema CREATE TABLE `ratings` ( `id` int(11) NOT NULL default '0', `rating` int(11) NOT NULL default '1', `rating_start` datetime NOT NULL default '0000-00-00 00:00:00', PRIMARY KEY (`id`) ) TYPE=MyISAM -myprogram.php foreach($ids as $id){ $sql = "SELECT rating FROM ratings WHERE id = '$id' AND rating_start >= NOW()"; $sql .= "ORDER BY rating_start DESC LIMIT 1;" $ret = $db->execute($id); } Can I teke same date from a Query? by using id IN (".implode(",",$ids).") and GROUP BY id

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  • self join table

    - by San82moon
    HI, i have a table, new_id----old_id----created_on 1234------5678------20100912 5678------3456------20100808 etc. i wrote this query, $q = "select event1.new_id, event1.old_id, event1.created_on,event2.new_id, event2.old_id, event2.created_on FROM replaced_isbns event1 JOIN replaced_isbns event2 ON event2.new_id = event1.old_id WHERE event1.new_id='$id'"; but i get result as 5678 - 1234, ie only one row, i want all rows... plz help me. Thanks, SLC

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  • Contact picker with search function

    - by tiex
    This question1 describes a way how to show list of phone numbers and select one of them if my app needs a phone number. But image if I have a huge contact list, it is not enough to just show list but possibility for filtering (by contact's name) is also needed. Is there a standard way to show phones list with picking possibility and with filtering possibility? (I wouldn't like to invent my own) Is there a solution for the problem for sdk 2.0 and lower?

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  • If inside Where mysql

    - by Barno
    Can I do an if inside Where? or something that allows me to do the checks only if the field is not null (path=null) SELECT IF(path IS NOT NULL, concat("/uploads/attachments/",path, "/thumbnails/" , nome), "/uploads/attachments/default/thumbnails/avatar.png") as avatar_mittente FROM prof_foto   WHERE profilo_id = 15  -- only if path != "/uploads/attachments/default/thumbnails/avatar.png" AND foto_eliminata = 0 AND foto_profilo = 1

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  • Access database query locks ability to edit table?

    - by Sattvic
    I created a query in Microsoft Access like the one below: SELECT Deliverables.ID, Deliverables.Title, Deliverables.Summary, Deliverables.Header_Code, Deliverables.Header_Code.Value, Deliverables.Sort_order, Deliverables.Pillar, Deliverables.Pillar.Value, Deliverables.Misc_ID FROM Deliverables WHERE (((Deliverables.Pillar.Value)="Link Building")); But my problem is that this query locks my fields and I cannot make changes to the table using the query view. Any suggestions? I am using Microsoft Access 2007

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