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• MySQL INSERT and SELECT Order of precedence

  - by Carlos Dubus

  Hi, if an INSERT and a SELECT are done simultaneously on a mysql table which one will go first? Example: Suppose "users" table row count is 0. Then this two queries are run at the same time (assume it's at the same mili/micro second): INSERT into users (id) values (1) and SELECT COUNT(*) from users Will the last query return 0 or 1?

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• mysql update unique index

  - by atno

  Is there a way to say UPDATE items SET qty=10 WHERE **unique key** instead of saying UPDATE items SET qty=10 WHERE userID=1 AND listID=10 and itemID=100 on the following table? CREATE TABLE IF NOT EXISTS `items` ( `userID` int(20) NOT NULL, `listID` int(20) NOT NULL, `itemID` int(20) NOT NULL, `qty` int(10) NOT NULL, UNIQUE KEY `unique` (`userID`,`listID`,`itemID`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

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• how to find duplicated field values and delete them in mysql

  - by Mac Taylor

  Consider we have a field named (username) in our table named (tpl_users), now this table has lots of duplicated rows I wrote this code to delete duplicated usernames: Delete FROM tpl_users WHERE username = username; How is it possible to delete duplicated usernames?

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• Take data from an XML file and put it into a MySQL database

  - by Aidan

  Hi Guys, I'm looking to construct a script that would go through an XML file. Would find specific tags in it, put them in a table and fill the table with specific tags within them. I'm using MySQL 5.1 so loadXML isn't an option and I think that ExtractData() method wont be much use either.. but I don't really know. What would be the best way to go about this?

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• MySQL doesn't use index in join query

  - by Kocsonya Laci

  I have two tables: comments(id(primary key), author, ip(index)) and visitors(id(primary key), date_time, ip(index)) I want to join them like that: SELECT visitors.date_time FROM comments LEFT JOIN visitors ON ( comments.ip = visitors.ip ) WHERE comments.author = 'author' LIMIT 10 It works, but very slow.. In EXPLAIN it shows that it doesn't use the index on the visitors table: id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE comments ref author author 78 const 9660 Using where 1 SIMPLE visitors ALL NULL NULL NULL NULL 8033 Any ideas? Thanks!

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• MySQL : Insert Exactly Same Data Multiple Rows Without PHP Loop

  - by Robert Hanson

  I need to insert same data to my MySQL table without having PHP loop. The reason why I'm doing this is that because I have a column with Auto_Increment feature and that column associates with other table. So, I just need to insert some exactly same data and it's multiple rows (dynamic) but by using single INSERT syntax below : INSERT INTO outbox_multipart (TextDecoded) VALUES ('$SMSMessage') how to have this single INSERT syntax, but produce n number of rows?

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• How to get the exact string within the brackets in mysql

  - by sreenath

  In my mysql table a field values are as follows: table name - "clients" field name - "accent" values are - "Eastern(Northern,Southern),Scottish(East Coast)" "Eastern(South,North,Southern),Scottish(East Coast)" If I give select accent from clients where accent like '%north%' if more than 100 records not in the same order. Strings with in the brackets are not in the same order means. It will give above two values. How should i get only second value? Please help me, thanks.

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• SQL - get latest records from table where field is unique

  - by 89stevenharris

  I have a table of data as follows id status conversation_id message_id date_created 1 1 1 72 2012-01-01 00:00:00 2 2 1 87 2012-03-03 00:00:00 3 2 2 95 2012-05-05 00:00:00 I want to get all the rows from the table in date_created DESC order, but only one row per conversation_id. So in the case of the example data above, I would want to get the rows with id 2 and 3. Any advice is much appreciated.

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• MySQL Multiple Subquery on same table

  - by user1444980

  I have a table of the following structure ID | Amount | Bank (1 or 2) ---+--------+------ 1 | 100000 | 1 2 | 256415 | 2 3 | 142535 | 1 1 | 214561 | 2 2 | 123456 | 1 1 | 987654 | 2 I want a result like this (from the same table): ID | sum(Bank 1) | sum(Bank 2) ---+-------------+------------ 1 | 100000 | 1202215 2 | 123456 | 256415 3 | 142535 | 0 What will be the easiest query to achieve this?

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• incrementing a table column's data by one || mySql

  - by Praveen Prasad

  iam having a table with columns like id || counter if i do something (some event) i want the counter's value(at a particular id) to increase by one , currently iam doing this : //get current value current_value = select counter from myTable where id='someValue' // increase value current_value++ //update table with current value update myTable set counter=current_value where id='someValue'; currently iam running 2 queries for this, please suggest me some way do it in one step.

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• how can i get the total from the four different table in single query

  - by karthikeyan1211

  In each table have many number of rows with amount. Like this i have different numbers of amount in each table. Each tables field name is different. How can i get the total of all values in the four tables in a single query? Any way is there?

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• using data from two tables in mysql by using php5

  - by rajson007

  hi friends, i want to get data from a table and use in the form's field and along with some new fields data i want to save all fields data in a new table,,' then what i have to do , thanxs in advance !!

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• Delete table in all the rendering pages of a single page in Javascript

  - by Aruna

  HI , i am having a table like in many pages .. All these pages are rendered in a single page . when i apply the javascript to delete that using on load with the below var tbl = document.getElementById('toc'); if(tbl) tbl.parentNode.removeChild(tbl); Only one table is deleted and not the others i am trying to delete the tables in all the rendering pages using javascript.how to do this??

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• MySQL Hibernate sort on 2 columns

  - by sammichy

  I have a table as follows Table item { ID - Primary Key content - String published_date - When the content was published create_date - When this database entry was created } Every hour (or specified time interval) I run a process to update this table with data from different sources (websites). I want to display the results according to the following rules. 1. The entries created each time the process runs should be grouped together. So the entries from the 2nd process run will always be after the entries from the first process run even if the published_date of an entry from the first run is after the published_date of an entry from the 2nd run. 2. Within the grouping by run, the entries by sorted by published_date 3. Another restriction is that I prefer that data from the same source not be grouped together. If I do the sort by create_date, published_date I will end up with data from source a, data from source b etc. I prefer that the data within each hour be mixed up for better presentation If I add a column to this table and store a counter which increments each time the process is run, it is possible to create a query to sort first by counter and then by published_dt. Is there a way to do it without adding a field? I'm using Hibernate over MySQL. e.g. Hour 1 (run 1) 4 rows collected from site a (rows 1-4) 3 rows collected from site b (rows 5-7) hour 2 (run 2) 2 row collected from site a (rows 8-9) 3 rows collected from site b (rows 10-12) ... After each run, new records are added to the database from each website. The create date is the time when the record was created in the database. The published date is part of the content and is read in from the external source. When the results are displayed I would like rows to be grouped together based on the hour they were published in. So rows 1-7 would be displayed before rows 8-12. Within each hourly grouping, I would like to sort the results by published date (timestamp). This is necessary so that the posts from all the sites collected in that hour are not grouped together but rather mixed in with each other.

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• How to display a mysql table data in another language properly in php

  - by Shinigami

  i have a mySQL table which the data in one of its columns is in a language other than English.(Persian) when i input data in the table , it is shown properly but when i want to show the data in a php file it displays like this:???? well,what should i do in order to show the data in its correct form?

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• MYSQL and Array with PHP for create Tag Cloud

  - by asilloo

  Hi, I'm trying to make a Tag cloud for every user in own page, I'm using PHP5 and Mysql, My table named "tags" and I want to make a array but in short way. The table like below, The array can be like for user1 array={[car,1],[cat,null],[pen,1],[dvd,1],[cd,null]} Username totaltag tag1 tag2 tag3 tag4 tag5 admin 5 car cat pen dvd cd user1 1 1 1 user2 1 2 12 1 user3 3 2 10 1

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• MySql Alter Syntax error with mulitple FK

  - by acidzombie24

  If i do the first one i have no problem. When i do addition i get a syntax error. What is wrong with the syntax? The error says syntax error near [entire 2nd line] alter table `ban_Status` add FOREIGN KEY (`banned_user`) REFERENCES `user_data`(`id`) alter table `ban_Status` add FOREIGN KEY (`banned_user`) REFERENCES `user_data`(`id`), FOREIGN KEY (`banning_user`) REFERENCES `user_data`(`id`), FOREIGN KEY (`unban_user`) REFERENCES `user_data`(`id`)

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• mysql get last auto increment value

  - by Mick

  Hi I have a field in mySql table called jobnumber which auto increments with each new entry. What I want to do is when a user views my form, get the value of the next 'jobnumber' . But I want to do this before any entry is made to the table. IE so when a user looks at a form it will display something like 'this is job number 6954' I have tried $rr = mysql_insert_id() but this only work after I have made an entry Can anyone help please thanks

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• mysql join 3 tables and count

  - by air

  Please look at this image here is 3 tables , and out i want is uid from table1 industry from table 3 of same uid count of fid from table 2 of same uid like in the sample example output will be 2 records Thanks

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• Does table columns increase select statement execution time

  - by paokg4

  I have 2 tables, same structure, same rows, same data but the first has more columns (fields). For example: I select the same 3 fields from both of them (SELECT a,b,c FROM mytable1 and then SELECT a,b,c FROM mytable2) I've tried to run those queries on 100,000 records (for each table) but at the end I got the same execution time (0.0006 sec) Do you know if the number of the columns (and in the end the size of the one table is bigger than the other) has to do something with the query execution time?

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• mysql command for update

  - by Mac Taylor

  hey guys i need to add a special text to all rows in my mysql table , how to add some text to the end of all rows' content in a table just for one field i used this code : UPDATE `blogs` SET `title`= `title`+ 'mytext'; but didnt work for me

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• Rails connect custom table to a model

  - by pepernik

  Hey. I have a model and I would like to define association to a custom table delayed_jobs. Example: class Message < AbstractBase belongs_to :delayed_job end Q: How can I create a association to a custom table. Thx 10x!

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• mysql insert with auto-increment column

  - by czuroski

  Hello, I am trying to insert data into a mysql table from a csv file. I am using the infile sql command, but I am having trouble because the first column of the table is an id that is set as an auto increment field. what do I have to set my first column value to in order to get this to work, or can I do it at all? Thanks

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• MySQL select one field from table WHERE condition is in multiple rows

  - by Alex

  Tried to find the answer, but still couldn't.. The table is as follows: id, keyword, value 1 display 15.6 1 harddrive 320 1 ram 3 So what i need is something like this.. Select an id from this table where (keyword="display" and value="15.6") AND (keyword="harddrive" and value="320") There's also a possibility that there will be 3 or 4 such keyword conditions which should result into returning one id (one row) It seems there's something to deal with UNION but i didn't use it before so i can't figure it out Thanks in advance

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• Connect to web-service/API in MySQL?

  - by Jesse Figueroa

  I'm creating a sql based procedure which can Accept a table load the values one at a time send the variables to a remote API Record the response of the API Write the response to a table for viewing later I have successfully implemented 1,2, and 5. I am hoping there may be some way of choosing an address to contact and for SQL to listen too for a response. Please let me know if you have any suggestions!

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