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• How do I delete every row except the last one for each day?

  - by A B

  I have a table with stock quotes that looks something like this: id, date, stock_id, value Every day has several rows for each stock_id (it is automatically updated every five minutes), so the table is rather big at the moment. How do i delete every row but the last one each day for every stock_id?

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• Online Hotel Booking System, Simultaneous Booking?

  - by KiiroSora09

  I'm asked to create an online booking system with online payment and I'm wondering what to do in the case when 2 customers booked for the same room(s) at the same time. For Example: At the same time: Customer1 and Customer2 booked for a standard room which only has 1 room available. (The Room availability will display that there is still 1 room available). And then they hit the 'confirm' button at the same time.

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• Doing sum's if certain conditions are true

  - by Gugu

  I am trying to build a query that does a sum if a certain parameter is set. For example: SELECT SUM(IF(<condition>,field,field)) AS total_value ...which is working correctly. But i have more than one condition in IF(), like: SELECT SUM(IF(<condition> <condition>,field,field)) AS total_value ..which is not working, could you have any idea what should be the right query for this.

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• How can I add a column to this union result?

  - by MrXexxed

  I have this query (which I removed some keys from for brevity's sake): SELECT id as in_id, out_id, recipient, sender, read_flag FROM received WHERE recipient=1 UNION ALL SELECT in_id, id AS out_id, recipient, sender, read_flag FROM sent WHERE sender=1 Which combines the results from two tables showing messages sent and received by a given user. What I'd like to do is add a column/flag to the result to distinguish which table the row belongs to so when I display them I can show a relevant icon for sent or received messages. How would I add this?

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• mysql_affected_rows() always returns 1 even though no row was updated.

  - by happyhardik

  What I am trying to do is: (programmatically) Update status where id is something, if no rows where updated, give error: we cannot find the record with id something, otherwise give message success. Here I am using mysql_affected_rows() to know if a row was updated or not, but it always return 1, so the user gets a success message, even though there was no row updated. Can anyone tell me what could it be?

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• sql count() query for tables

  - by air

  i have two tables table1 fields fid,fname,fage a ,abc ,20 b ,bcv ,21 c ,cyx ,19 table2 fields rcno,fid,status 1 ,a ,ok 2 ,c ,ok 3 ,a ,ok 4 ,b ,ok 5 ,a ,ok i want to display rectors like this fid from table1 , count(recno) from table 2 and fage from table1 fid,count(recno),fage a ,3 ,20 b ,2 ,21 c ,1 ,19 i try many sql queries but got error Thanks

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• Count of Sums possibly using group_by

  - by Daniel Johnson

  Say you have a user table and an order table which references user (user has_many orders) and contains an item count field. How could you efficiently ask "how many uses ordered how many items?" That is, to generate something along the lines of: Number of users | sum of items ------------------------------- 5 users | 1 item 4 users | 5 items 1 user | 7 items Thanks in advance.

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• Allow users to pull temporary data then delete table data (headers remain)?

  - by JM4

  I don't know the best way to title this question but am trying to accomplish the following goal: When a client logs into their profile, they are presented with a link to download data from an existing database in CSV format. The process works, however, I would like for this data to be 'fresh' each time they click the link so my plan was - once a user has clicked the link and downloaded the CSV file, the database table would 'erase' all of its data and start fresh (be empty) until the next set of data populated it. My EXISTING CSV creation code: <?php $host = 'localhost'; $user = 'username'; $pass = 'password'; $db = 'database'; $table = 'tablename'; $file = 'export'; $link = mysql_connect($host, $user, $pass) or die("Can not connect." . mysql_error()); mysql_select_db($db) or die("Can not connect."); $result = mysql_query("SHOW COLUMNS FROM ".$table.""); $i = 0; if (mysql_num_rows($result) > 0) { while ($row = mysql_fetch_assoc($result)) { $csv_output .= $row['Field'].", "; $i++; } } $csv_output .= "\n"; $values = mysql_query("SELECT * FROM ".$table.""); while ($rowr = mysql_fetch_row($values)) { for ($j=0;$j<$i;$j++) { $csv_output .= '"'.$rowr[$j].'",'; } $csv_output .= "\n"; } $filename = $file."_".date("Y-m-d",time()); header("Content-type: application/vnd.ms-excel"); header("Content-disposition: csv" . date("Y-m-d") . ".csv"); header( "Content-disposition: filename=".$filename.".csv"); print $csv_output; exit; ?> any ideas?

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• Why does this sql code give error 1066 (Not unique table/alias: ‘customer)?

  - by aadersh patel

  SELECT customer.id, customer.firstName, account.id FROM customer, account INNER JOIN customer ON customer.id = account.customerId ORDER BY customer.id appologies for the poor editing...

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• How can I add dynamic text from a different table where primary key is a foreign key to adynamic table being shown?

  - by Jethro Tamares Doble

  I have here a dynamic table named tb_user with column region_id and institute_id and both ids are primary key of another table tb_region (with column region_name and region_id) and tb_institute (column institute_id and institute_name). I wanted to see region_name and institute_name instead of the ids. I've used this php script <?php echo $row_institute['institution_name']; ?> and query to collect data for tb_institute mysql_select_db($database_connection_ched, $connection_ched); $query_institution = "SELECT institute_id, institute_name FROM tb_institute"; $institution = mysql_query($query_institution, $connection_ched) or die(mysql_error()); $row_institution = mysql_fetch_assoc($institution); $totalRows_institution = mysql_num_rows($institution); but it seems not to display the correct name of id. query i used to collect data: mysql_select_db($database_connection_ched, $connection_ched); $query_notification = sprintf("SELECT * FROM tb_user WHERE status = 'inactive' ORDER BY date_register ASC", GetSQLValueString($colname_notification, "text")); $query_limit_notification = sprintf("%s LIMIT %d, %d", $query_notification, $startRow_notification, $maxRows_notification); $notification = mysql_query($query_limit_notification, $connection_ched) or die(mysql_error()); $row_notification = mysql_fetch_assoc($notification); if (isset($_GET['totalRows_notification'])) { $totalRows_notification = $_GET['totalRows_notification']; } else { $all_notification = mysql_query($query_notification); $totalRows_notification = mysql_num_rows($all_notification); } $totalPages_notification = ceil($totalRows_notification/$maxRows_notification)-1;

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• SQL query for selecting most recent entries

  - by Mr_Skid_Marks

  A table in my database has a column, DATE_ADDED (stored in seconds). I want to extract all rows with the most recent date (aka largest value for DATE_ADDED). The only solution I have come up with is to SELECT all the rows in ASC (ascending) order, grab the last entry from the table, check the date on this, and perform another SELECT on the table but this time only for the discovered DATE_ADDED. Is it possibly to simplify this series of queries into a single one? My thought is I should be able to do a SELECT on all of the largest values in the table, but I am struggling to come up with a proper query.

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• Check value existance while performing a UPDATE query

  - by nimo

  Hi, I need to perform a simple update query where the update should only be done, if there is no value with updating value (item_name). For example, DB table [item_types] item_id(PK) | item_name Assuming there exist item_id with 6, My attempt is UPDATE item_types as k SET k.item_name = 'item_1' WHERE NOT EXISTS (SELECT * FROM item_types as a WHERE a.item_name = 'item_1') AND k.item_id = '6' But this gives me error "You can't specify target table 'k' for update in FROM clause" Could you please explain the error here and how can I achieve this ? Thank you

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• How To Get YEARWEEK() To See Sunday As The Start Of The Week?

  - by tan

  I'm trying to get the YEARWEEK function to see Sunday as the 1st day of the week. An example date is: Sunday 1st Mar 2009 Here is my sql SELECT YEARWEEK('2009-03-01') and the result is - 200909 Which is week 9. I believe it is telling me this is week 9 because it sees the sunday as the last day of the previous week. How would I get this function to see sunday as the 1st day of the week and therefore return as week 10?

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• how to update a specific field(column) of a row by that row's autoincrement value with some prefix

  - by I Like PHP

  i have below table it_id item_id item_name 1 ite_1 shirt 2 ite_10 pant 3 ite_11 socks 4 ite_12 shoes 5 ite_13 belt now i need to change item_id with with ite_(value of it_id of that row) means if it_id=x then item_id should be ite_x and so on... what will b sql query for that??

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• How to pass a variable to a IN clause?

  - by Thanu

  Lets say I have a SP that has a SELECT statements as follows, SELECT product_id, product_price FROM product WHERE product_type IN ('AA','BB','CC'); But data goes to that IN clause must be through a single variable that contains the string of values. Something link below SELECT product_id, product_price FROM product WHERE product_type IN (input_variables); But its not working that way. Any idea how to do this?

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• how can i query a table that got split to 2 smaller tables? Union? view ?

  - by danfromisrael

  hello friends, I have a very big table (nearly 2,000,000 records) that got split to 2 smaller tables. one table contains only records from last week and the other contains all the rest (which is a lot...) now i got some Stored Procedures / Functions that used to query the big table before it got split. i still need them to query the union of both tables, however it seems that creating a View which uses the union statement between the two tables lasts forever... that's my view: CREATE VIEW `united_tables_view` AS select * from table1 union select * from table2; and then i'd like to switch everywhere the Stored procedure select from 'oldBigTable' to select from 'united_tables_view'... i've tried adding indexes to make the time shorter but nothing helps... any Ideas? PS the view and union are my idea but any other creative idea would be perfect! bring it on! thanks!

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• What statistics app should I use for my website?

  - by Camran

  I have my own server (with root access). I need statistics of users who visit my website etc etc... I have looked at an app called Webalyzer... Is this a good choice? I run apache2 on a Ubuntu 9 system... If you know of any good statistics apps for servers please let me know. And a follow-up question: All statistics are saved in log-files right? So how large would these log-files become then? Possibility to split them would be good, dont know if this is possible with Webalyzer though...

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• Return all users from group(s) specified as comma delimited value

  - by todor

  I have the following two table scenario: users id groups 1 1,2,3 2 2,3 3 1,3 4 3 and groups id 1 2 3 How do I return the IDs of all users that belong to group 2 and 1 for example? Should I look into join, a helper group_membership table or function to separate the comma delimited group IDs to get something like this: group_membership user_id group_id 1 1 1 2 1 3 2 2 2 3 ... ...

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• With a SELECT...WHERE id IN (...), order results by IN() ?

  - by Deca

  With a query such as: SELECT * FROM images WHERE id IN (12,9,15,3,1) is it possible to order the results by the contents of the IN clause? The result I'm looking for would be something like: [0] => Array ( [id] => 12 [file_name] => foo ) [1] => Array ( [id] => 9 [file_name] => bar ) [2] => Array ( [id] => 15 [file_name] => baz ) ...

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• Complex SELECT statement; one-to-many all details in one row

  - by RubyWedge

  There are two tables: Products ID (Primary Key), ProductName PlannedByMonths ProductID (Primary Key) (Link to the Products table many-to-one), MonthNumber (Primary Key), QtytoProduce, How to write SELECT statement to retrieve results in the following format? ProductName, QtytoProduceMonth1, QtytoProduceMonth2, QtytoProduceMonth3, QtytoProduceMonth4, QtytoProduceMonth5, QtytoProduceMonth6, QtytoProduceMonth7, QtytoProduceMonth8, QtytoProduceMonth9, QtytoProduceMonth10, QtytoProduceMonth11, QtytoProduceMonth12 Thank you.

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• Make SQL query more efficient

  - by Webnet

  I currently have this query which runs 2 of the exact same sub queries but pull different data. When I make the values comma separated it throws an SQL error saying the sub query can return only one value. Is there anything else I can do to avoid running multiple sub queries? SELECT product_id, ( SELECT COUNT(listing_id) FROM ebay_archive_product_listing_assoc WHERE product_id = product_master.product_id) as listing_count, sku, type_id, ( SELECT AVG(ebay_archive_listing.current_price), AVG(ebay_archive_listing.buy_it_now_price) FROM ebay_archive_listing WHERE id IN ( SELECT listing_id FROM ebay_archive_product_listing_assoc WHERE product_id = product_master.product_id ) AND ebay_archive_listing.start_time >= '.$startTimestamp.' AND ebay_archive_listing.start_time <= '.$endTimestamp.' AND ebay_archive_listing.current_price > 0 ) as average_bid_price, ( SELECT FROM ebay_archive_listing WHERE id IN ( SELECT listing_id FROM ebay_archive_product_listing_assoc WHERE product_id = product_master.product_id ) AND ebay_archive_listing.start_time >= '.$startTimestamp.' AND ebay_archive_listing.start_time <= '.$endTimestamp.' AND ebay_archive_listing.buy_it_now_price > 0 ) as average_buyout_price FROM product_master I'm aware of the syntax error... I'm selecting 2 seperate averages and am wondering if I can do it any simpler way.

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• IF statement within WHILE not working

  - by Ds.109

  I am working on a basic messaging system. This is to get all the messages and to make the row of the table that has an unread message Green. In the table, there is a column called 'msgread'. this is set to '0' by default. Therefore it should make any row with the msgread = 0 - green. this is only working for the first row of the table with the code i have - i verified that it is always getting a 0 value, however it only works the first time through in the while statement .. require('./connect.php'); $getmessages = "SELECT * FROM messages WHERE toperson = '" . $userid . "'"; echo $getmessages; $messages = mysql_query($getmessages); if(mysql_num_rows($messages) != 0) { $table = "<table><tr><th>From</th><th>Subject</th><th>Message</th></tr>"; while($results = mysql_fetch_array($messages)) { if(strlen($results[message]) < 30){ $message = $results[message]; } else { $message = substr($results[message], 0 ,30) . "..."; } if($results[msgread] == 0){ $table .= "<tr style='background:#9CFFB6'>"; $table .= "<td>" . $results[from] . "</td><td>" . $results[subject] . "</td><td><a href='viewmessage.php?id=" . $results[message_id] ."'>" . $message . "</a></td></tr>"; } else { $table .= "<tr>"; $table .= "<td>" . $results[from] . "</td><td>" . $results[subject] . "</td><td><a href='viewmessage.php?id=" . $results[message_id] ."'>" . $message . "</a></td></tr>"; } } echo $table ."</table>"; } else { echo "No Messages Found"; } There's all the code, including grabbing the info from the database. Thanks.

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• What does the below query explain?

  - by Parth

  What does the below query explain? SELECT * FROM `jos_menu` WHERE (id = 69 OR id = 72) I know its very silly question, but sometimes easy things creates mess in my skulls interpreter.. Pls help EDIT Its giving me record for both IDs, why is it doing so? It should five me the record for either 69 or 72....

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• Creating an SQL query to list all clients, who spent over 1000$

  - by Lapa

  So, I have three tables with the following rows: Customers (Customer_id and Name), Orders (Customer_id, Product_id, Quantity) and Products (Price). How do I write a query which shows all customers who spent more than 1000$? Do I have to join the tables?

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• "=null" and select statement!

  - by user329820

  Hi I have asked this question before in this forum and they told me that it will retun an empty result set,I want to know that if I set the column with null values it will retun an empty result set?also the ANSI_NULLS is OFF ,thanks SELECT 'A' FROM T WHERE A = NULL;

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