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  • MySQL: Request to select the last 10 send/received messages to/by different users

    - by Yako malin
    I want to select the 10 last messages you received OR you sent TO different users. For example the results must be shown like that: 1. John1 - last message received 04/17/10 3:12 2. Thomy - last message sent 04/16/10 1:26 3. Pamela - last message received 04/12/10 3:51 4. Freddy - last message received 03/28/10 9:00 5. Jack - last message sent 03/20/10 4:53 6. Tom - last message received 02/01/10 7:41 ..... Table looks like: CREATE TABLE `messages` ( `id` int(11) NOT NULL AUTO_INCREMENT, `time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP, `sender` int(11) DEFAULT NULL, `receiver` int(11) DEFAULT NULL, `content` text ) I think Facebook (and the iPhone) use this solution. When you go to your mail box, you have the last messages received/sent grouped by Users (friends). So I will take an example. If I have theses messages (THEY ARE ORDERED YET): **Mike** **Tom** **Pam** Mike Mike **John** John Pam **Steve** **Bobby** Steve Steve Bobby Only Message with ** should be returned because they are the LAST messages I sent/received By User. In fact I want the last message of EACH discussion. What is the solution?

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  • MYSQL query to return rows that are NOT in a set

    - by iglurat
    Hi, I have two tables: Contact (id,name) Link (id, contact_id, source_id) I have the following query which works that returns the contacts with the source_id of 8 in the Link table. SELECT name FROM `Contact` LEFT JOIN Link ON Link.contact_id = Contact.id WHERE Link.source_id=8; However I am a little stumped on how to return a list of all the contacts which are NOT associated with source_id of 8. A simple != will not work as contacts without any links are not returned. Thanks.

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  • Transform Search String into FullText Compatible Search String?

    - by Alex
    I'm working with the fulltext search engine of MSSQL 2008 which expects a search string like this: ("keyword1" AND "keyword2*" OR "keyword3") My users are entering things like this: engine 2009 "san francisco" hotel december xyz stuff* "in miami" 1234 something or "something else" I'm trying to transform these into fulltext engine compatible strings like these: ("engine" AND "2009") ("san francisco" AND "hotel" AND "december" AND "xyz") ("stuff*" "in miami" "1234") ("something" OR "something else") I have a really difficult time with this, tried doing it using counting quotation marks, spaces and inserting etc. but my code looks like horrible for-and-if vomit. Can someone help?

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  • PHP mySQL database check

    - by kielie
    Hi guys, I am having endless troubles with duplicate entries, so I need to check the database, and if a user has already entered that day, their entry will not be submitted and they will be redirected to a landing page that tells them they have already entered that day, and that they may only enter again tomorrow. The field I would like to check is the id_number field in the database, since each user has a unique id number, so basically, if a user with the same id number submitted on the same date they should be redirected to a landing page, how would I go about doing this? I am still new to a lot of this, so please be forgiving. Thanx in advance.

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  • Limiting selected rows count with a stored procedure parameter in MySQL

    - by ssobczak
    I have a procedure SelectProc wich contains SELECT statement. I want to add a procedure param LimitRowsCount and use it as following: CREATE PROCEDURE SelectProc (IN LimitRowsCount INTEGER UNSIGNED) BEGIN SELECT (...) LIMIT LimitRowsCount; END but this approach doesn't work. The SELECT itself contains nested subqueries so I can't create view from it. Is there a way more propper then dynamic SQL (prepared statements) ?

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  • MySQL: Transactions across multiple threads

    - by Zombies
    Preliminary: I have an application which maintains a thread pool of about 100 threads. Each thread can last about 1-30 seconds before a new task replaces it. When a thread end, that thread almost always will result in inserting 1-3 records into a table, this table is used by all of the threads. Right now, no transactional support exists, but I am trying to add that now. So... Goal I want to implement a transaction for this. The rules for whether or not this transaction commits or rollback reside in the main thread. Basically there is a simple function that will return a boolean. Can I implement a transaction across multiple connections? If not, can multiple threads share the same connection? (Note: there are a LOT of inserts going on here, and that is a requirement).

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  • problems with mysql "or"

    - by Simon
    i have a problem with "and" "or" syntax!!! here is my query. . . SELECT `act1`.`name`, `act1`.`surname`, `act2`.`name`, `act2`.`surname`, `act3`.`name`, `act3`.`surname` FROM videos, actors AS act1, actors AS act2, actors AS act3 WHERE videos.ident = 'somethink' AND ( act1.id = videos.id_actor1 OR act2.id = videos.id_actor2 OR act3.id = videos.id_actor3 ) it returns me all variations of {name, surname}, but why!!! i want the name and surname of first axactly, second and thirth, if they exist!!! halp me please

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  • MySQL slow query

    - by andrhamm
    SELECT items.item_id, items.category_id, items.title, items.description, items.quality, items.type, items.status, items.price, items.posted, items.modified, zip_code.state_prefix, zip_code.city, books.isbn13, books.isbn10, books.authors, books.publisher FROM ( ( items LEFT JOIN bookitems ON items.item_id = bookitems.item_id ) LEFT JOIN books ON books.isbn13 = bookitems.isbn13 ) LEFT JOIN zip_code ON zip_code.zip_code = items.item_zip WHERE items.rid = $rid` I am running this query to get the list of a user's items and their location. The zip_code table has over 40k records and this might be the issue. It currently takes up to 15 seconds to return a list of about 20 items! What can I do to make this query more efficient?

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  • Getting mysql row that doesn't conflict with another row

    - by user939951
    I have two tables that link together through an id one is "submit_moderate" and one is "submit_post" The "submit_moderate" table looks like this id moderated_by post 1 James 60 2 Alice 32 3 Tim 18 4 Michael 60 Im using a simple query to get data from the "submit_post" table according to the "submit_moderate" table. $get_posts = mysql_query("SELECT * FROM submit_moderate WHERE moderated_by!='$user'"); $user is the person who is signed in. Now my problem is when I run this query, with the user 'Michael' it will retrieve this 1 James 60 2 Alice 32 3 Tim 18 Now technically this is correct however I don't want to retrieve the first row because 60 is associated with Michael as well as James. Basically I don't want to retrieve that value '60'. I know why this is happening however I can't figure out how to do this. I appreciate any hints or advice I can get.

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  • MySQL where condition but not limited by it

    - by Manny Calavera
    Hello. I would like to run a query on my database like this: SELECT SUM( t1.value ) AS total1, SUM( t2.value ) AS total2, SUM( t3.value ) AS total3, SUM( t4.value ) AS total4 FROM pay1 t1, pay2 t2, pay3 t3, pay4 t4 WHERE t1.date = '2010-04-29' AND t2.date = '2010-04-29' AND t3.date = '2010-04-29' AND t4.date = '2010-04-29' I am generating a report on payments and I would like to see a total of payments from each table based on the matching date. The problem is that some of the tables would not meet the condition of date and I want them to show up with 0 value if not. Currently, if any of the tables does not match the date, I get 0 results. I want to display value of 0 anywhere the date is not met and other fields should appear with the found values. The perfect operand for me would be "ANDOR" so that it won't be limited by any date that doesn't math in any table. Unfortunately, ANDOR does not exist as I am aware of so what should I do ? Can anyone help ? Thanks.

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  • How Can I truncate Multiple Tables in MySql?

    - by Luiscencio
    I need to clear all my inventory tables. I've tryed SELECT 'TRUNCATE TABLE ' + TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME LIKE 'inventory%' but I get this error: Truncated incorrect DOUBLE value: 'TRUNCATE TABLE ' Error Code 1292 if this is the correct way, then what am I doing wrong?

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  • MySQL Cursor Issue

    - by James Inman
    I've got the following code - this is the first time I've really attempted using cursors. DELIMITER $$ DROP PROCEDURE IF EXISTS demo$$ DROP TABLE IF EXISTS temp$$ CREATE TEMPORARY TABLE temp( id INTEGER NOT NULL AUTO_INCREMENT, start DATETIME NOT NULL, end DATETIME NOT NULL, PRIMARY KEY(id) ) $$ CREATE PROCEDURE demo() BEGIN DECLARE done INT DEFAULT 0; DECLARE a, b DATETIME; DECLARE cur1 CURSOR FOR SELECT MAX(end) AS end FROM ( SELECT id, start, end, @r := @r + (start > @edate) AS num, @edate := GREATEST(@edate, end) FROM ( SELECT @r := 0, @edate := '0001-01-01' ) vars, student_lectures WHERE ( student_id = 1 AND start >= '2010-04-26 00:00:00' AND end <= '2010-04-30 23:59:59' ) ORDER BY start ) q GROUP BY num; DECLARE cur2 CURSOR FOR SELECT MIN(start) AS start FROM ( SELECT id, start, end, @r := @r + (start > @edate) AS num, @edate := GREATEST(@edate, end) FROM ( SELECT @r := 0, @edate := '0001-01-01' ) vars, student_lectures WHERE ( student_id = 1 AND start >= '2010-04-26 00:00:00' AND end <= '2010-04-30 23:59:59' ) ORDER BY start ) q GROUP BY num LIMIT 1, 18446744073709551615; DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1; OPEN cur1; OPEN cur2; REPEAT FETCH cur1 INTO a; FETCH cur2 INTO b; IF NOT done THEN INSERT INTO temp(start, end) VALUES(a,b); END IF; UNTIL done END REPEAT; CLOSE cur1; CLOSE cur2; END $$ SELECT * FROM temp; I'm not getting anything outputted into the temp table. Running the following query gives me output, so I know there's rows it should be matching - but I imagine I've made some obvious mistake. SELECT MAX(end) AS end FROM ( SELECT id, start, end, @r := @r + (start > @edate) AS num, @edate := GREATEST(@edate, end) FROM ( SELECT @r := 0, @edate := '0001-01-01' ) vars, student_lectures WHERE ( student_id = 1 AND start >= '2010-04-26 00:00:00' AND end <= '2010-04-30 23:59:59' ) ORDER BY start ) q GROUP BY num; The output this query returns: +---------------------+ | end | +---------------------+ | 2010-04-26 13:00:00 | | 2010-04-26 18:15:00 | | 2010-04-27 11:00:00 | | 2010-04-27 13:00:00 | | 2010-04-27 18:15:00 | | 2010-04-28 13:00:00 | | 2010-04-29 13:00:00 | | 2010-04-29 18:15:00 | | 2010-04-30 13:00:00 | | 2010-04-30 15:15:00 | | 2010-04-30 17:15:00 | +---------------------+ 11 rows in set (0.02 sec)

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  • How to simplify my country select menu PHP/mysql

    - by user342391
    I have a select menu that displays countries. It looks at the DB and judging by the value in the db shows the option as selected. Is there a simpler way off doing this than: if ($country == 'AG') {echo '<option value="AG" selected="selected">Antigua</option>';} else {echo '<option value="AG">Antigua</option>';}; if ($country == 'AR') {echo '<option value="AR" selected="selected">Argentina</option>';} else {echo '<option value="AR">Argentina</option>';}; if ($country == 'AM') {echo '<option value="AM" selected="selected">Armenia</option>';} else {echo '<option value="AM">Armenia</option>';}; if ($country == 'AW') {echo '<option value="AW" selected="selected">Aruba</option>';} else {echo '<option value="AW">Aruba</option>';}; if ($country == 'AU') {echo '<option value="AU" selected="selected">Australia</option>';} else {echo '<option value="AU">Australia</option >';}; if ($country == 'AT') {echo '<option value="AT" selected="selected">Austria</option>';} else {echo '<option value="AT">Austria</option>';}; if ($country == 'AZ') {echo '<option value="AZ" selected="selected">Azerbaijan</option>';} else {echo '<option value="AZ">Azerbaijan</option>';}; if ($country == 'BS') {echo '<option value="BS" selected="selected">Bahamas</option>';} else {echo '<option value="BS">Bahamas</option>';}; if ($country == 'BH') {echo '<option value="BH" selected="selected">Bahrain</option>';} else {echo '<option value="BH">Bahrain</option>';}; There are a lot of countries and doing this would be madness wouldn't it????

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  • String Manipulation: Spliting Delimitted Data

    - by Milli Szabo
    I need to split some info from a asterisk delimitted data. Data Format: NAME*ADRESS LINE1*ADDRESS LINE2 Rules: 1. Name should be always present 2. Address Line 1 and 2 might not be 3. There should be always three asterisks. Samples: MR JONES A ORTEGA*ADDRESS 1*ADDRESS2* Name: MR JONES A ORTEGA Address Line1: ADDRESS 1 Address Line2: ADDRESS 2 A PAUL*ADDR1** Name: A PAUL Address Line1: ADDR1 Address Line2: Not Given My algo is: 1. Iterate through the characters in the line 2. Store all chars in a temp variables until first * is found. Reject the data if no char is found before first occurence of asterisk. If some chars found, use it as the name. 3. Same as step 2 for finding address line 1 and 2 except that this won't reject the data if no char is found My algo looks ugly. The code looks uglier. Spliting using //* doesn't work either since name can be replaced with address line 1 If the data is *Address 1*Address2, split will create two indexes in the array where index 0 will have the value of Address 1 and index 2 will have the value of Address2. Where's the name. Was there a name? Any suggestion?

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  • Mysql : Count Posts and Group by date

    - by Oguz
    Hello , I am not very good at sql , generally I use php to do my complicated tasks , But in this task , there are lots of data , so using php for counting posts is very slow. So I want a sql which counts post by date , but my date column in table is php's time stamp.I will crate post number x date chart

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  • Incorrect table name, php/mysql

    - by user296516
    Hi guys, I've got this code mysqli_query ( $userdatabase, 'CREATE TABLE `user_'.$emailreg.'` ( ID int NOT NULL AUTO_INCREMENT PRIMARY KEY, IP varchar(10), FLD1 varchar(20), FLD2 varchar(40), FLD3 varchar(25), FLD4 varchar(25), FLD5 varchar(25) )' ); echo ( mysqli_error ($userdatabase) ); that works fine on my localhost, but when I upload it to the server, it starts giving me a "Incorrect table name '[email protected]'" error. any idea? Thanks!

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  • MYSQL: Simplify this Query for better performance

    - by Treby
    How can i simplify this code. coz this uses subquerying SELECT ub.id_product as c_pid,DATE(ub.datetime_prchs)AS datePurchased,cb.bookname, (SELECT GROUP_CONCAT(c.userid ORDER BY c.userid ASC SEPARATOR ', ') FROM user_books ub INNER JOIN campus_bookinfo cb ON ub.id_product=cb.idx_campus_bookinfo LEFT JOIN customer c ON ub.id_customer=c.id_customer WHERE ub.id_product = c_pid )as buyer, cb.iAmount FROM user_books ub INNER JOIN campus_bookinfo cb ON ub.id_product=cb.idx_campus_bookinfo LEFT JOIN customer c ON ub.id_customer=c.id_customer WHERE ub.id_customer = 29 GROUP BY bookname ORDER BY ub.datetime_prchs I need a better code for the same output.. Thanks in advance

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  • mysql select update

    - by Tillebeck
    Got this: Table a ID RelatedBs 1 NULL 2 NULL Table b AID ID 1 1 1 2 1 3 2 4 2 5 2 6 Need Table a to have a comma separated list as given in table b. And then table b will become obsolete: Table a ID RelatedBs 1 1,2,3 2 4,5,6 This does not rund through all records, but just ad one 'b' to 'table a' UPDATE a, b SET relatedbs = CONCAT(relatedbs,',',b.id) WHERE a.id = b.aid

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  • mysql order-by original "where order"

    - by Benjamin Dobnikar
    I have this order-by problem I canot crack. I select from my table like this: SELECT * FROM 'sidemodules' WHERE name = 'module1' OR name = 'module2' OR 'name3' Which returns me the modules I want. But the modules lie the table, say in this order: module3 module1 module2 And they are returned to me in this order. How can I get them to display in order AS IN THE WHERE CLAUSE (1,2,3) ? Big thanks!

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  • Select between dates with wildcard mysql

    - by Michael
    Hi, I am trying to select between two dates, but in the table they have timestamps after them. Example: calldate is 2010-03-16 22:43:28 How would I select this using calldate between '$date1' AND '$date2' to wildcard the timestamp after the date? I tried using like but it didn't work I just want to do between '$date1%' AND '$date2%' Anyone know how to do this? Thank you in advance!

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