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  • mysql joins - how to find all children that belongs to ALL parents

    - by kimsia
    I have three mysql tables items the columns are id, title items_in_categories the columns are id, item_id, category_id categories the columns are id, title I want to find all the items that belong to ALL the stated categories. Not any one category, but ALL categories Eg, if I want to search all the items that belongs to category id 3 and 5 I would like to use as simple a way as possible. I have tried AND and a nested NOT EXISTS as stated in the mysql manual. Nothing worked.

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  • mysql delete and foreign key constraint

    - by user121196
    I'm deleting selected rows from both table in MYSQL, the two tables have foreign keys. delete d,b from A as b inner join B as d on b.bid=d.bid where b.name like '%xxxx%'; MYSQL complains about foreign keys even though I'm trying to delete from both tables: Error: Cannot delete or update a parent row: a foreign key constraint fails (yyy/d, CONSTRAINT fk_d_bid FOREIGN KEY (bid) REFERENCES b (bid) ON DELETE NO ACTION ON UPDATE NO ACTION) what's the best solution here to delete from both table?

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  • how to add a port to mysql server

    - by Shvilam
    I wont to add to mysql other tcp port that he will be lessen to and i will be able to connect to that port from my application i have duplicate my appliction and i runing them both from the same machine they both connected to the mysql server that are running on the same machine the problem is that the default port 3306 all ready taken thanks

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  • MySQL counting question

    - by gew
    How do I find out which user entered the most articles and then count how many articles that user entered using PHP & MySQL. Here is my MySQL tables. CREATE TABLE users_articles ( id INT UNSIGNED NOT NULL AUTO_INCREMENT, user_id INT UNSIGNED NOT NULL, title TEXT NOT NULL, acontent LONGTEXT NOT NULL, PRIMARY KEY (id) ); CREATE TABLE users ( user_id INT UNSIGNED NOT NULL AUTO_INCREMENT, username VARCHAR(255) DEFAULT NULL, pass CHAR(40) NOT NULL, PRIMARY KEY (user_id) );

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  • What doesn't MySQL do? [closed]

    - by sean riley
    When using MySQL 5.1 Enterprise after years of using other database products like Sybase, Infomix, DB2; I run into things that MySQL just doesn't do. For example, it can only generate an EXPLAIN query plan for SELECT queries. What are the other things I should watch out for?

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  • Can anyone tell me what is wrong with my create trigger syntax?

    - by Travis
    I am experimenting with triggers for the first time. When I try to create a trigger using the following: CREATE TRIGGER t_foldersPrivate BEFORE DELETE ON foldersPrivate FOR EACH ROW BEGIN DELETE FROM programs WHERE folderType = '0' AND folderID = OLD.ID; END; I receive the following error: `1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 3` (mysql 5.1.37) If I get rid fo the delete statement the create trigger statement works fine. So I am assuming it must have something to do with that. But for the life of me I'm not sure what...

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  • Faster way to dump mysql

    - by japancheese
    This may be a dumb question, but I was just watching a screencast on MySQL replication, and I learned that a master database doesn't send SQL over to a slave for replication, it actually sends data over in binary, which makes importing extremely fast. I started wondering, "if a database can export and import binary, why do mysqldumps / imports take so long?" Is there a way to get mysql to dump a database in binary in a similar fashion to speed up that process as well?

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  • Convert SQL Server Varbinary field to MYSQL, keeping data intact

    - by Mike Sheridan
    I was given the daunting task of converting a ASP website to PHP and SQL Server to MySQL, and I ran into an issue that hopefully somebody can help I have a user table which has a password field with datatype Varbinary(128), are using pwdencrypt to encrypt the password. Is there a way to transfer that over to MySQL, and somehow i need to be able to keep the password intact... how can i go about that? any pointers would be greatly appreciated!

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  • 3-clique counting in a graph

    - by Legend
    I am operating on a (not so) large graph having about 380K edges. I wrote a program to count the number of 3-cliques in the graph. A quick example: List of edges: A - B B - C C - A C - D List of cliques: A - B - C A 3-clique is nothing but a triangle in a graph. Currently, I am doing this using PHP+MySQL. As expected, it is not fast enough. Is there a way to do this in pure MySQL? (perhaps a way to insert all 3-cliques into a table?)

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  • mysql import script by query instead of bash

    - by vick
    I have a file called script.sql how can I run that file using q mysql query? global $sql; $res = $sql->query("\. /script.sql")or die(mysql_error()); gives: #1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '\. /script.sql' at line 1

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  • Table character encoding - exception in application

    - by zgnilec
    I have a code: CREATE TABLE IF NOT EXISTS Person ( name varchar(24) ... ) CHARACTER SET utf8 COLLATE utf8_polish_ci; This works OK in my application, but I read if someone put in name field a string that contains character wchich code is greater than 127, database will use 2 bytes (or more) to store this character. So i think, i will change character set to utf16: CHARACTER SET utf16 COLLATE utf16_polish_ci; But now when I run my application, exception apears: KeyNotFoundException. It apears exactly at these instructions: MySqlCommand komenda = baza.Polaczenie.CreateCommand (); komenda.CommandText = zapytanie; MySqlDataReader dr = komenda.ExecuteReader (); // HERE, at execute reader method if (dr.Read ()) ... 1) Anyone had similar problem? 2) Any idea how to use always 2 bytes/char in database field?

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  • MySQL dno't wont to store unicode charecter

    - by Qiao
    Why MySQl don't wont to store unicode character ??? Yes, it is rare hieroglyph, you wouldn't see it in the browser. UTF16 is U+2B5EE Warning: #1366 Incorrect string value: '\xF0\xAB\x97\xAE' for column 'ch' at row 1 Is it possible to store this character in MySQL?

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  • mysql: inserting data and autoincrement

    - by every_answer_gets_a_point
    i am converting from access to mysql i have a table in access where one of the columns is an autonumber when i transfer the data into the mysql database (where i also have a column that is auto_increment), should i be transfering the auto_increment data into the auto_increment column, or will it auto_increment itself? how do i ensure that if i do not transfer the autoincrement data from access, that it auto_increments properly?

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  • Django - Add rows to MySQL database

    - by yeenow123
    So I already have a database setup with a few columns and a few rows already inserted in. I'm trying to create a view that you would just input information into a form and press Submit, then a row would be added to the MySQL database with the information you just typed in. I believe you can do this with admin, but I would like to try without admin and I'm not sure if this is possible? I've been using the MySQL commandline to add rows as of now..

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  • which is better, creating a view or a new table?

    - by Carson
    I have some demanding mysql queries that are needed to grap same datasets from several mysql tables. I am thinking of creating a table or view to gather all demanding columns from other tables, so as to increase performance. If I create that table, I may need to do extra insert / update / delete operation each time other tables updated. if I create view, I am worrying if the performance can be greatly improved. Because data from other tables are changing very frequently. Most likely, the view may need to be created first everytime before selecting it. Any ideas? e.g. how to cache? other extra measures I can do?

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  • Http download stream in PHP and MySQL

    - by Vishal
    Hello, How can I read from mysql and write the same in http output stream. So its like if send a request http://www.xyz.com/download/A it should return me data for A from mysql through php. The data is plain text. Thanks PS: I am new to php.

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  • Equivalent of Oracle’s RowID in MySQL

    - by echo
    is there an equivalent of oracle's rowid in mysql? delete from my_table where rowid not in (select max(rowid) from my_table group by field1,field2) I want to make a mysql equivalent of this query!!! What i'm trying to do is, : The my_table has no primary key.. i'm trying to delete the duplicate values and impose a primary key (composite of field1, field2)..!!

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