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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 - count rows by field

  - by Qiao

  all rows in table have type field. It is either 0 or 1. I need to count rows with 0 and with 1 in one query. So that result is something like: type0 type1 1234 4211 How it can be implemented?

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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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• join query in mysql cursor

  - by parag

  As the title describes all we can declare cursor like this DECLARE cur1 CURSOR FOR SELECT id,data FROM test.t1; Can we use join query instead off simple query?

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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 one-to-many query

  - by Stomped

  I've got 3 tables that are something like this (simplified here ofc): users user_id user_name info info_id user_id rate contacts contact_id user_id contact_data users has a one-to-one relationship with info, although info doesn't always have a related entry. users has a one-to-many relationship with contacts, although contacts doesn't always have related entries. I know I can grab the proper 'users' + 'info' with a left join, is there a way to get all the data I want at once? For example, one returned record might be: user_id: 5 user_name: tom info_id: 1 rate: 25.00 contact_id: 7 contact_data: 555-1212 contact_id: 8 contact_data: 555-1315 contact_id: 9 contact_data: 555-5511 Is this possible with a single query? Or must I use multiple?

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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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• 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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• 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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• mySql table returning JSON that needs formatting for a iPhone UITableview

  - by Michael Robinson

  I have a php query the returns the following JSON format from a table. [{"memberid":"18", "useridFK":"30", "loginName":"Johnson", "name":"Frank", "age":"23", "place":"School", }, It needs the following format: [{"memberid":"18" { "useridFK":"30", "loginName":"Johnson", "name":"Frank", "age":"23", "place":"School",} }, I can figure out where/how to convert this, Where would I create the formatting following: (1) In the php return? (2) the JSON instructions for deserialization? or (3) Some kinb of Obj-C coding instruction? My end use is a simple Drill Down table using the NSObject, so when I select "memberid" row, I'll get the child/detail list on the next UITableview. My Data.plist will look like the following: Root: Dictionary V Rows: Array V Item 0: Dictionary Title: String 18 V Children Array V Item 0 Dictionary Title String 30 etc. Thanks in advance, this site rocks.

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• Grouping timestamps by interval between timestamps, then calculating from group MySQL

  - by Emile

  To put this question into context, I'm trying to calculate "time in app" based on an event log. Assume the following table: user_id event_time 2 2012-05-09 07:03:38 3 2012-05-09 07:03:42 4 2012-05-09 07:03:43 2 2012-05-09 07:03:44 2 2012-05-09 07:03:45 4 2012-05-09 07:03:52 2 2012-05-09 07:06:30 I'd like to get the difference between the highest and lowest event_time from a set of timestamps that are within 2 minutes of eachother (and grouped by user). If a timestamp is outside of a 2 minute interval from the set, it should be considered a part of another set. Desired output: user_id seconds_interval 2 7 (because 07:03:45 - 07:03:38 is 7 seconds) 3 0 (because 07:03:42) 4 9 (because 07:03:52 - 2012-05-09 07:03:43) 2 0 (because 07:06:30 is outside 2 min interval of 1st user_id=2 set) This is what I've tried, although I can't group on seconds_interval (even if I could, I'm not sure this is the right direction): SELECT (max(tr.event_time)-min(tr.event_time)) as seconds_interval FROM some_table tr INNER JOIN TrackingRaw tr2 ON (tr.event_time BETWEEN tr2.event_time - INTERVAL 2 MINUTE AND tr2.event_time + INTERVAL 2 MINUTE) GROUP BY seconds_interval

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• Mysql storing quotes as &#39;

  - by Click Upvote

  I have some PHP code which stores whatever is typed in a textbox in the databse. If I type in bob's apples, it gets stored in the database as bob&#39;s apples. What can be the problem? The table storing this has the collation of latin1_swedish_ci.

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• Non distinct Unique ID in MySQL database table.

  - by Geoff

  First of, a simplified version: I am wondering if I can create a trigger to activate during INSERT (it's actually LOAD DATA INFILE) and NOT enter records for an RMA already in my table? I have a table that has no records that are unique. Some may be duplicates but there is one field that I can use to know if the data has been entered or not. For instance RMA Op Days --------------------- 213 Repair 0.10 213 Test 0.20 213 Repair 0.10 So I could do an index on the three columns together but as you see it's possible for an RMA to be in a step for the same amount of time twice so it's possible to have duplicate records. This data comes from a report that I cannot edit and this is all it provides. The key is that an RMA's data is only in the report once so if my database already has that RMA in it's records I want to skip the loading of that RMA's records from the report. By all means please let me know if that didn't make sense, I'll Explain as needed. I'm sure it's not uncommon but I couldn't find anything on the net.

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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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• Sha1 mysql proper settings

  - by Doodle

  What are the proper settings for storing a password that has been run through sha1?

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• Sorting MySQL results within a resultset

  - by InnateDev

  I have a resultset of lets say 10 results. 3 of them have a type 'Pears', and the next 3 have a type 'Apples' and the next three have a type of 'Bananas'. The last record has a type of 'Squeezing Equipment' - unrelated to the fruits. How do I return this set of results (for pagination too) in a GROUPED order that I specify WITHOUT using any inherent sort factor like ALPHABETA or ID etc? I have the all types at my disposal before running the code so they can be specified. i.e. ID | Bananas ID | Bananas ID | Bananas ID | Apples ID | Apples ID | Apples ID | Pears ID | Pears ID | Pears ID | Squeezing Equipment

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• MySQL DUMP as CSV

  - by swt83

  I've looked around and nothing seems to work: $file = '/path/to/file.csv'; $cmd = 'mysqldump DATABASE TABLE > '.$file.' --host=localhost --user=USER --password=PASS'; $cmd .= ' --lock-tables=false --no-create-info --tab=/tmp --fields-terminated-by=\',\''; exec($cmd); Everything I try creates an empty CSV file. Any ideas? Thanks much.

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• complex mysql query problem

  - by Scarface

  Hey guys I have a query that selects data and organizes but not in the correct order. What I want to do is select all the comments for a user in that week and sort it by each topic, then sort the cluster by the latest timestamp of each comment in their respective cluster. My current query selects the right data, but in seemingly random order. Does anyone have any ideas? select * from ( SELECT topic.topic_title, topic.topic_id FROM comments JOIN topic ON topic.topic_id=comments.topic_id WHERE comments.user='$user' AND comments.timestamp>$week order by comments.timestamp desc) derived_table group by topic_id

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• Mysql CASE and UPDATE

  - by Rosengusta Garrett

  I asked yesterday how I could update only the first column that was empty. I got this of a answer: UPDATE `names` SET `name_1` = CASE WHEN `name_1` = '' then 'Jimmy' else `name_1` end, `name_2` = CASE WHEN `name_1` != '' and `name_2` = '' then 'Jimmy' else `name_2` end I tried it and it ended up updating every column with 'Jimmy' what's wrong with this? I can't find anything. It could possibly be the structure of the database. So here is what each name_* column is setup like: # Name Type Collation Attributes Null Default Extra 1 name_1 varchar(255) latin1_swedish_ci No None

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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 eliminate user based on conditions

  - by Dustin

  I asked this last week over the weekend and it got buried in the archives before anyone could answer. So forgive me if you've already seen this. I teach classes and want to be able to select those students who have taken one class, but not another class. I have two tables: lessons_slots which is the table for every class such as: -------------------- -ID name slots- -1 basics 10 - -2 advanced 10 - -3 basics 10 - --------------------- The other table is class_roll, which holds enrollment info, such as: -------------------- -sID classid firstname lastname- -1 1 Jo Schmo -2 1 Person Two ... -13 2 Jo Schmo --------------------- What I want to do, I select everyone who has not had the advanced class (for example). I've tried doing SELECT * FROM lessons_slots LEFT JOIN class_roll ON lessons_slots.ID = class_roll.classid WHERE lessons_slots.name != 'advanced' But that doesn't work...All it does is eliminate that row, without eliminating the user. I want Jo Schmo, for example, to not show up in the results. Any ideas?

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• I'm looking for a textbook based introduction to PHP5/mysql/javascript for a new webdeveloper

  - by prgrmnGuru

  I also want the books to be no older than 1 year old. And by textbook i mean i want the author(s) to go into the syntax,semantix,structure of the programming language as well as provide questions/mini projects to test what you learned after every section/chapter.

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• PHP MySQL join table

  - by Jordan Pagaduan

  $sql = "SELECT logs.full_name, logout.status FROM logs, logout WHERE logs.employee_id = logout.employee_id"; tables -- logs logout I'm having error on this. I search join tables in google. And that's what I got. What is wrong with this code?

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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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