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  • MySQL: LIMIT then RAND rather than RAND then LIMIT

    - by Larry
    I'm using full text search to pull rows. I order the rows based on score (ORDER BY SCORE) , then of the top 20 rows (LIMIT 20), I want to rand (RAND) the result set. So for any specific search term, I want to randomly show 5 of the top 20 results. My workaround is code based- where I put the top 20 into an array then randomly select 5. Is there sql way to do this?

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  • MySQL stored procedure, handling multiple cursors and query results

    - by Tirithen
    How can I use two cursors in the same routine? If I remove the second cursor declaration and fetch loop everthing works fine. The routine is used for adding a friend in my webapp. It takes the id of the current user and the email of the friend we want to add as a friend, then it checks if the email has a corresponding user id and if no friend relation exists it will create one. Any other routine solution than this one would be great as well. DROP PROCEDURE IF EXISTS addNewFriend; DELIMITER // CREATE PROCEDURE addNewFriend(IN inUserId INT UNSIGNED, IN inFriendEmail VARCHAR(80)) BEGIN DECLARE tempFriendId INT UNSIGNED DEFAULT 0; DECLARE tempId INT UNSIGNED DEFAULT 0; DECLARE done INT DEFAULT 0; DECLARE cur CURSOR FOR SELECT id FROM users WHERE email = inFriendEmail; DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1; OPEN cur; REPEAT FETCH cur INTO tempFriendId; UNTIL done = 1 END REPEAT; CLOSE cur; DECLARE cur CURSOR FOR SELECT user_id FROM users_friends WHERE user_id = tempFriendId OR friend_id = tempFriendId; DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1; OPEN cur; REPEAT FETCH cur INTO tempId; UNTIL done = 1 END REPEAT; CLOSE cur; IF tempFriendId != 0 AND tempId != 0 THEN INSERT INTO users_friends (user_id, friend_id) VALUES(inUserId, tempFriendId); END IF; SELECT tempFriendId as friendId; END // DELIMITER ;

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  • Trouble pre-populating drop down and textarea from MySQL Database

    - by Tony
    I am able to successfully pre-populate my questions using the following code: First Name: <input type="text" name="first_name" size="30" maxlength="20" value="' . $row[2] . '" /><br /> However, when I try to do the same for a drop down box and a textarea box, nothing is pre-populated from the database, even though there is actual content in the database. This is the code I'm using for the drop down and textarea, respectively: <?php echo ' <form action ="edit_contact.php" method="post"> <div class="contactfirstcolumn"> Prefix: <select name = "prefix" value="' . $row[0] . '" /> <option value="blank">--</option> <option value="Dr">Dr.</option> <option value="Mr">Mr.</option> <option value="Mrs">Mrs.</option> <option value="Ms">Ms.</option> </select><br />'; ?> AND Contact Description:<textarea id = "contactdesc" name="contactdesc" rows="3" cols="50" value="' . $row[20] . '" /></textarea><br /><br /> It's important to note that I am not receiving any errors. The form loads fine, however without the data for the drop down and textarea fields. Thanks! Tony

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  • Where Is The MYSQL Settings File Located On A Windows Installation

    - by Joshua
    I need to set "lower_case_table_names", but I don't have any idea where to start. I'm using XAMPP and I don't know where to look for the file or that the exact name of the file is. One source said my.cnf another said my.conf, but neither of those files exist on my drive. Is it possible I need to create such a file? And if so, what folder must I put it in for the settings to take?

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  • Variable collation with MySQL stored procedure?

    - by Chad Johnson
    I want to do something like this in a stored procedure: IF case_sensitive = FALSE THEN SET search_collation = "utf8_unicode_ci"; ELSE SET search_collation = "utf8_bin"; END IF; INSERT INTO TABLE1 (field1, field2) SELECT * FROM TABLE 2 WHERE some_field LIKE '%rarf%' collate search_collation; However, when I do this, I get ERROR 1273 (HY000): Unknown collation: 'search_collation' How can I use a dynamic collation without having two copies of the same query?

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  • Getting the record ID just added with mysql prepared statements

    - by dmontain
    I'm inserting a record using PDO (very similar to mysqli). $addRecord->execute(); To know if the operation worked, I've learned that I can save it to a variable $result that can be used as true false $result = $addRecord->execute(); if ($result){ //add successful } else { //add unsuccessful } What I'd like to do is also get the record id just added. In the table, each record has an auto_incremented field called id. I tried doing this $new_id = $result['id']; but it seems that $result is purely boolean and doesn't actually hold the actual record that was added. Can someone confirm this and how would I then access the record just added? Note that several people may be adding to the same table at the same time, so I think getting just the last one would not be very accurate.

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  • MySQL field type for a comments field or text area

    - by Derek
    As the title says, I'm after a good field type for a comments field I have in a table. It will store many characters (as users can continuously add to it) so it's definitely over 255. I looked at longtext but wasn't sure...Also how do I change the field type to accept different characters such as apostrophies. Thanks.

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  • using a php variable in the WHERE clause of a mysql query

    - by user1262890
    I'm running a very simple query that I think should work. The only thing that I haven't done before is put a php variable in the WHERE clause of the query. The variable $X is a numerical value, say 100. When I run this query, I just get a value of 0 returned. Am I doing something obviously stupid? SELECT generator_64k.n FROM generator_64k WHERE generator_64k.n<= '$X' I've looked around the web and also tried this: SELECT generator_64k.n FROM generator_64k WHERE generator_64k.n<= '" . $X . "' But this also just returns 0. Any ideas? Thanks in advance.

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  • MySQL Basic about relationship

    - by Roberto
    Hi all! My doubt is about how to treat the follow thing: I have a system where a user belong to a company, and this user have their clients. How is the right way to get a list of all company clients and the follow user name?? In the client table where i have a field with the one of this relations: A company_id and user_id field Just company_id field Just user_id field cause user table have the company_id??? Something else... Tkz Roberto

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  • Complex query in mysql

    - by Satish
    I have two tables reports and holidays. reports: (username varchar(30),activity varchar(30),hours int(3),report_date date) holidays: (holiday_name varchar(30), holiday_date date) select * from reports gives +----------+-----------+---------+------------+ | username | activity | hours | date | +----------+-----------+---------+------------+ | prasoon | testing | 3 | 2009-01-01 | | prasoon | coding | 4 | 2009-01-03 | | gautam | coding | 1 | 2009-01-05 | | prasoon | coding | 4 | 2009-01-06 | | prasoon | coding | 4 | 2009-01-10 | | gautam | coding | 4 | 2009-01-10 | +----------+-----------+---------+------------+ select * from holidays gives +--------------+---------------+ | holiday_name | holiday_date | +--------------+---------------+ | Diwali | 2009-01-02 | | Holi | 2009-01-05 | +--------------+---------------+ When I used the following query SELECT dates.date AS date, CASE WHEN holiday_name IS NULL THEN COALESCE(reports.activity, 'Absent') WHEN holiday_name IS NOT NULL and reports.activity IS NOT NULL THEN reports.activity ELSE '' END AS activity, CASE WHEN holiday_name IS NULL THEN COALESCE(reports.hours, 'Absent') WHEN holiday_name IS NOT NULL and reports.hours IS NOT NULL THEN reports.hours ELSE '' END AS hours, CASE WHEN holiday_name IS NULL THEN COALESCE(holidays.holiday_name, '') ELSE holidays.holiday_name END AS holiday_name FROM dates LEFT OUTER JOIN reports ON dates.date = reports.date LEFT OUTER JOIN holidays ON dates.date = holidays.holiday_date where reports.username='gautam' and dates.date>='2009-01-01' and dates.date<='2009-01-10'; I got the following output +----------+-----------+---------+------------+ | date | activity | hours | holiday | +----------+-----------+---------+------------+ |2009-01-05| coding | 1 | Holi | +----------+-----------+---------+------------+ |2009-01-10| coding | 4 | | +----------+-----------+---------+------------+ but I expected this +----------+-----------+---------+------------+ | date | activity | hours | holiday | +----------+-----------+---------+------------+ |2009-01-01| Absent | Absent | | +----------+-----------+---------+------------+ |2009-01-02| | | Diwali | +----------+-----------+---------+------------+ |2009-01-03| Absent | Absent | | +----------+-----------+---------+------------+ |2009-01-04| Absent | Absent | | +----------+-----------+---------+------------+ |2009-01-05| Coding | 1 | Holi | +----------+-----------+---------+------------+ |2009-01-06| Absent | Absent | | +----------+-----------+---------+------------+ |2009-01-07| Absent | Absent | | +----------+-----------+---------+------------+ |2009-01-08| Absent | Absent | | +----------+-----------+---------+------------+ |2009-01-09| Absent | Absent | | +----------+-----------+---------+------------+ |2009-01-10| Coding | 4 | | +----------+-----------+---------+------------+ How can I modify the above query to get the desired output(for a particular user (gautam in this case))?

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  • MYSQL: Like Method, Similar Words - But Don't Show the Searched Word

    - by elmaso
    Hello, actually i use this method to show similar words for a search request.. $query = "SELECT * FROM searches WHERE Query LIKE '%$search%' ORDER BY Query"; if someone searches for "nelly" it looks up in the database for similar words "nelly furtado, nelly ft. kelly"... but i dont want to show up the searched word.. example: you've searched for nelly - try this too: nelly, nelly furtado, nelly ft., the bold word should not showed up again, because it's the searched word.. is there maybe a method with MATCH AGAINST? thank you!

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  • text indexes vs integer indexes in mysql

    - by imanc
    Hey, I have always tried to have an integer primary key on a table no matter what. But now I am questioning if this is always necessary. Let's say I have a product table and each product has a globally unique SKU number - that would be a string of say 8-16 characters. Why not make this the PK? Typically I would make this field a unique index but then have an auto incrementing int field as the PK, as I assumed it would be faster, easier to maintain, and would allow me to do things like get the last 5 records added with ease. But in terms of optimisation, assuming I'd only ever be matching the full text field and next doing text matching queries (e.g. like %%) can you guys think of any reasons not to use a text based primary key, most likely of type varchar()? Cheers, imanc

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

    - by Yako malin
    Hello, 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 ) Have someone any solution ? Thanks in advance for your help.

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  • mysql naming convention

    - by Lizard
    I have generally always used some sort of Hungarian Notation for my field names in my tables e.g. #Table Users u_id, u_name, u_email etc... #Posts p_id, p_u_id, p_title, p_content etc... But I have recently been told that this isn't best practice. Is there a more standard way of doing this? I haven't really liked just using the field id as this is then requirs you to select table.field for fields names that appear in mutliple tables when using joins etc. Your thoughts on what is best practice would be appreciated.

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  • PHP/MySQL database connection priority?

    - by Josh
    Hello, I have a production database where usage statistics for a service we're working on. I use php to periodically roll up different resolutions (day, week, month, year) of interesting statistics in buckets dictated by the resolution. The php application I've written "completes" its data when its run, such that it will calculate all the rolled-up statistics for the resolutions and periods since it was last run. This is useful if we want to turn this off to debug database performance issues, because I can turn it back on and have it complete its data set. The problem I have, is the calculations are fairly intensive and drive the QPS of the production database server up. Is there a way to set a "priority" on a particular database connection so that it will only use "off-cycles" to do these calculations? Maybe a proper response would be to replicate the tables I'm working on into a different stats database, but, unfortunately I don't have the resources in place to attempt such a thing (yet). Thanks in advance for any help, Josh

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  • mysql Delete and Database Relationships

    - by Colin
    If I'm trying to delete multiple rows from a table and one of those rows can't be deleted because of a database relationship, what will happen? Will the rows that aren't constrained by a relationship still be deleted? Or will the entire delete fail? Thanks, Colin

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  • MySQL stuck on "using filesort" when doing an "order by"

    - by noko
    I can't seem to get my query to stop using filesort. This is my query: SELECT s.`pilot`, p.`name`, s.`sector`, s.`hull` FROM `pilots` p LEFT JOIN `ships` s ON ( (s.`game` = p.`game`) AND (s.`pilot` = p.`id`) ) WHERE p.`game` = 1 AND p.`id` <> 2 AND s.`sector` = 43 AND s.`hull` > 0 ORDER BY p.`last_move` DESC Table structures: CREATE TABLE IF NOT EXISTS `pilots` ( `id` mediumint(5) unsigned NOT NULL AUTO_INCREMENT, `game` tinyint(3) unsigned NOT NULL DEFAULT '0', `last_move` int(10) NOT NULL DEFAULT '0', UNIQUE KEY `id` (`id`), KEY `last_move` (`last_move`), KEY `game_id_lastmove` (`game`,`id`,`last_move`) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=8 ; CREATE TABLE IF NOT EXISTS `ships` ( `id` mediumint(5) unsigned NOT NULL AUTO_INCREMENT, `game` tinyint(3) unsigned NOT NULL DEFAULT '0', `pilot` mediumint(5) unsigned NOT NULL DEFAULT '0', `sector` smallint(5) unsigned NOT NULL DEFAULT '0', `hull` smallint(4) unsigned NOT NULL DEFAULT '50', UNIQUE KEY `id` (`id`), KEY `game` (`game`), KEY `pilot` (`pilot`), KEY `sector` (`sector`), KEY `hull` (`hull`), KEY `game_2` (`game`,`pilot`,`sector`,`hull`) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=8 ; The explain: id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE p ref id,game_id_lastmove game_id_lastmove 1 const 7 Using where; Using filesort 1 SIMPLE s ref game,pilot,sector... game_2 6 const,fightclub_alpha.p.id,const 1 Using where; Using index edit: I cut some of the unnecessary pieces out of my queries/table structure. Anybody have any ideas?

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  • stored procedure in MYsql access in PHP

    - by xcodemaddy
    Hi.. I am creating stored procedure ,here code : CREATE PROCEDURE `dbnm`.`getlogin` ( IN uid INT, IN upass VARCHAR(45) ) BEGIN if exists(select uphno,pass from user_master where uphno=uid and pass=upass)then ***true else ***false end if; END $$ DELIMITER ; i want return value(**true or **false) in stored procedure from PHP by calling sp PHP code: $res = $mysqli->query('call getlogin("1","rashmi")'); how to acesss boolean value in PHP from sp? Thanks

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  • mysql unique-constraint

    - by Cypher
    I have two tables -- Variables (id, name) and Variable_Entries (id, var_id, value). I want each variable to have a unique set of entries. If I make the value entry unique then a different variable won't be able to have that same value which is not right. Is there some way to make the value column unique for identical var_id's?

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  • Multiple foreign keys in one table to 1 other table in mysql

    - by djerry
    Hey guys, I got 2 tables in my database: user and call. User exists of 3 fields: id, name, number and call : id, 'source', 'destination', 'referred', date. I need to monitor calls in my app. The 3 ' ' fields above are actually userid numbers. now i'm wondering, can i make those 3 field foreign key elements of the id-field in table user? Thanks in advance...

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  • Unable to compare valuesfrom mysql in a prepared statement

    - by Cortopasta
    I can't seem to get this to connect to the database so that I can run my prepared statement. Does anybody have an idea what I've forgotten? private function check_credentials($plain_username, $password) { global $dbcon; $ac = new ac(); $ac->dbconnect(); $userid = $dbcon->prepare('SELECT id FROM users WHERE username = :username AND password = :password LIMIT 1'); $userid->bindParam(':username', $plain_username); $userid->bindParam(':password', $password); $userid->execute(); $id = $userid->fetch(); Return $id; } EDIT: I changed the SQL query from a SELECT FROM query, to an INSERT INTO query and it worked. WHat the heck is going on?

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