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• How can I employ "if exists" for creating or dropping an index in MySQL?

  - by Paul

  I was wondering if there's a way to check if an index exists before creating it or destroying it on MySQL. It appears that there was a feature request for this a few years back, but I can't find any documentation for a solution. This needs to be done in a PHP app using MDB2.

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• import a text file into a temporary table using 'Load data infile' in a stored procedure- MySQL

  - by Pankaj

  I need to import a text file into a temporary table and from that select portions of it to insert in different tables. I wanted to use 'LOAD DATA INFILE'. Is there any way, i can use 'Load data infile' in a stored procedure. I am using mysql. LOAD DATA LOCAL INFILE 'C:\\MyData.txt' INTO TABLE tempprod fields terminated by ',' lines terminated by '\r\n'; SELECT * FROM product p;

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• MySQL/PHP: How to insert logged in user id into another table that is gathering data from a form tha

  - by Lisa

  For the first time I am needing to join information from two tables and am quite nervous about doing it without any advice first. Basically, I am building a secure site that is accessed by authorised users. I have my login table with user_id, username, password Once the user is on the site, they have the option of inputting data into another table called input. At the moment this table only captures the information that is entered, not the user_id or username of the inputter. I would like the form to be able to input the user_id and/or username from the login table into the input table. Please could somebody talk me through this process? I am sure that once this is amended, I will then be able to use the table to only allow the logged in user to access the information that he or she have inputted, is that correct? Many thanks

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• How can I connect to a mysql db from a different server ?

  - by HJ-INCPP

  Hello, I have, let's say, a root website with mysql db on a remote server. I want to connect to that particular database (to make queries), from many other little websites (with lower priviledges). Can this be done? Language: jsp,java,php Thank you

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• SQL how to avoid duplicate insert in a table

  - by user1624531

  how to avoid duplicate insert in a table? I use below query to insert in to table: insert into RefundDetails(ID,StatusModified,RefundAmount,OrderNumber) select O.id,O.StatusModified,OI.RefundAmount,O.OrderNumber from Monsoon.dbo.[Order] as O WITH (NOLOCK) JOIN Monsoon.dbo.OrderItem as OI WITH (NOLOCK)on O.Id = OI.OrderId WHERE o.ID in (SELECT OrderID FROM Mon2QB.dbo.monQB_OrderActivityView WHERE ACTIVITYTYPE = 4 AND at BETWEEN '10/30/2012' AND '11/3/2012') AND (O.StatusModified < '11/3/2012')

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• How do I select a random record efficiently in MySQL?

  - by user198729

  mysql> EXPLAIN SELECT * FROM urls ORDER BY RAND() LIMIT 1; +----+-------------+-------+------+---------------+------+---------+------+-------+---------------------------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+-------+------+---------------+------+---------+------+-------+---------------------------------+ | 1 | SIMPLE | urls | ALL | NULL | NULL | NULL | NULL | 62228 | Using temporary; Using filesort | +----+-------------+-------+------+---------------+------+---------+------+-------+---------------------------------+ The above doesn't qualify as efficient,how should I do it properly?

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• How to hack MySQL GROUP_CONCAT to fetch a limited number of rows?

  - by Misier

  I somehow need this feature,but MySQL doesn't support it at this moment. I'm using GROUP_CONCAT(CONCAT(...)) to generate a xml-like stuff. But when the size exceeds the limit,the xml is just broken! So I have to somehow make it only retrieve 5 rows !

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• how do I display list of URLS say maximum 50 per web page from MySQL database??

  - by mathew

  I do have thousands of urls in my database. what I want to do is display all urls in multiple pages say number of URLS per page is 100 and alphabetically then when ever a user search for a URL info it should get updated on relevant page. for example if it is google.com then it should get updated on "G" page and no duplicate entry. how can I do this with PHP and MySQL??

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• Is there a way to listen for changes in an MySQL database table using Java and JDBC?

  - by adrian7

  I have a number of users which are logged in at a time in my desktop application. They are working on the same table (create, read, update, delete data) so I have to update their views, to reflect changes, every few seconds - currently I am thinking to use a different thread to do that. I am using the MySQL database engine. Is there a way, using JDBC, to listen for changes on a specific table in the database and triggering a Java method only when changes are made?

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• Sorting mysql array value after string chars swapped from fetched DB data.

  - by Shail Patel

  I want to sort one column fetched from mysql DB, and stored in an array. After fetching I am doing below steps. 1- DB Fetching fields array in row format. ->Field1, Field2, Field3, Field4, Field5 2- From that fields array One columns data [Field3], swapping string keywords. eg. AB013, DB131, RS001 to->013AB, 131DB, 001RS Now I want to sort above value in new string format like-> 001RS, 013AB, 131DB

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• ASP.Net (C#) & MSQL -or- PHP & MySQL for Performance?

  - by Mike Curry

  Money, Staff, Skill and preference to open source or commercial is neutral. Lets take the best of the best programmers (for arguments sake) and think about this: What will perform better overall: PHP & MySQL or ASP.Net & Microsoft SQL (I don't want biased answers, just looking for Performance, and Speed).

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• Can I lock tables in an IF statement in MySQL?

  - by MalcomTucker

  This is throwing a syntax error - --from body of a stored proc IF (name = in_name) SET out_id = temp; ELSE LOCK TABLE People WRITE; INSERT INTO People (Name) VALUES (in_name); UNLOCK TABLE; SELECT LAST_INSERT_ID() INTO out_id END IF do I have to lock any tables I need at the start of the SP?

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• Is there a way to make Linq to Entities map unrecognized methods/functions to MySql functions?

  - by Luiscencio

  Is there a way to make Linq to Entities map unrecognized methods/functions to MySql functions? I want to add support to some functions like Convert.*

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• How to use Triggers for Logging History of database change in MySQL?

  - by Parth

  How to use Triggers for Logging History of database change in MySQL? If yes, then is it possible to create a sepearte db for trigger tables for tracking history of other Db tables??

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• How to get structed result using nested set in MySQL and PHP?

  - by user198729

  There is no limitation on the depth. How to get the structed branch or even entire tree? The definition is from here: http://dev.mysql.com/tech-resources/articles/hierarchical-data.html

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• Easiest way to choose a percentage of an amount of rows from a MySQL table?

  - by Rob

  I have a script that has a GET variable: $_GET['percentage'] I have a MySQL table of data. Now lets say that there are 100 rows of data in this table. In pseudo-code: SELECT data FROM table Now would it be possible to select $_GET['percentage'] of random data from table? For example (again in pseudo-code): $_GET['percentage'] = 10; SELECT 10% of data from table order by rand() If this IS possible, how could I do it?

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• Is it possible to apply the Replication mechanism on single MySQL server?

  - by Parth

  Is it possible to apply the Replication mechanism on single MySQL server? I want to replicate the changes done in test db to Main db in the same server, so can i use this Replication mechanism on same server?

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• How many millions records can Mysql reasonably deal with with .NET ?

  - by asksuperuser

  Anybody can tell his experience with MySQL and .NET dealing with millions of records ? Need to be able to cope with 50 to 100 Millions records.

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• Oracle 10g multiple DELETE statements

  - by bmw0128

  I'm building a dml file that first deletes records that may be in the table, then inserts records. Example: DELETE from foo where field1='bar'; DELETE from foo where fields1='bazz'; INSERT ALL INTO foo(field1, field2) values ('bar', 'x') INTO foo(field1, field2) values ('bazz', 'y') SELECT * from DUAL; When I run the insert statement by itself, it runs fine. When I run the deletes, only the last delete runs. Also, it seems to be necessary to end the multiple insert with the select, is that so? If so, why is that necessary? In the past, when using MySQL, I could just list multiple delete and insert statements, all individually ending with a semicolon, and it would run fine.

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• Insert consecutive numbers

  - by Markus

  Hi. I have a table A (Acons, A1, A2, A3) in which I should insert information from another table B with columns (B1, B2, B3). The Acons is a column in which should contain some consecutive numbers (it is not an identity and I cannot make it identity). I know xmin - starting the from number the sequence has to be computed. How can I insert the rows into the table A, using a single Insert statement? I tried like the following, but it didn't work: DECLARE @i AS INT; SET @i = xmin; INSERT INTO A(Acons, A1, A2, A3) SELECT @i = (Bcons = (@i + 1)), B1, B2, B3 FROM B Unfortunatelly, the above solution does not work;

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• how to send multiple row to mysql at same time(like bulk copy)?

  - by Ayyappan.Anbalagan

  I am using asp.net + Mysql. I have multiple rows in my dataset; I have to store the rows in my database table. How to do that?

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• Is there a way to delete the most recent entry in MySQL using PHP?

  - by user300371

  I want to delete the most recent entry in MySQL using PHP, is there a function that allows me to do that? $query2 = "DELETE FROM test WHERE ___";

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• HOw do I show number of fetching of a data in a MySQL data base??

  - by mathew

  HI I would like to show to user how many time a data has been accessed. I am using MySQl and PHP...

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• How do I identify which MySQL slave has responded?

  - by Kynth

  I have a MySql Master server replicating to three Slaves. A legacy website is performing load-balanced Reads from the Slaves. Is there a method of identifying from the website which of the Slaves is serving a Read request? I'd prefer a function that I can use to return a server name or ip address as part of the SELECT, but any reasonable method will do. Thank you in advance.

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• How to insert image into word document using java code

  - by sukhada garud

  How to insert image into word document using java code

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