https://www.fplanque.com/tech/databases/ Recent content in Databases on fplanque.com [EN] Hugo -- 0.134.3 en-us Sun, 12 Jun 2022 17:41:12 +0000 https://www.fplanque.com/tech/databases/mysql/what-s-my-mysql-version-number/ Mon, 01 Oct 2007 16:44:00 +0000 https://www.fplanque.com/tech/databases/mysql/what-s-my-mysql-version-number/ In order to determine which MySQL version you're running you can type the following command: mysql -V Sample results: # mysql -V mysql Ver 14.7 Distrib 4.1.11, for pc-linux-gnu (i386) # mysql -V mysql Ver 14.12 Distrib 5.0.32, for pc-linux-gnu… https://www.fplanque.com/tech/databases/mysql/charsets-in-mysql-4-1/ Mon, 03 Oct 2005 14:40:00 +0000 https://www.fplanque.com/tech/databases/mysql/charsets-in-mysql-4-1/ Once you start messing around with charsets in MySQL you eventually get to a situation where the default charset for your database is UTF-8 but you want to import old backups in their own charset, for instance ISO-LATIN-1. But when you import it, MySQL… https://www.fplanque.com/tech/databases/database-abstraction-layers-illusion/ Tue, 12 Apr 2005 10:08:00 +0000 https://www.fplanque.com/tech/databases/database-abstraction-layers-illusion/ Many people think that DB abstraction is cool. I get emails about this topic all the time. People suggesting we add a DB abstraction layer to b2evolution, or offering to do so themselves. So why haven't we added one yet? Well, simply because DB… https://www.fplanque.com/tech/databases/mysql/mysql-data-integrity-enforcement-caveats/ Thu, 31 Mar 2005 17:21:00 +0000 https://www.fplanque.com/tech/databases/mysql/mysql-data-integrity-enforcement-caveats/ Okay, I desperately lack time to write full articles posts lately, so I'm going to make this quick! :P Background: Suppose you have a table named Now, here's my point: from my experience I have found that a hell lot of things can go wrong when you try… https://www.fplanque.com/tech/databases/mysql/mysql-features-by-version-breakdown/ Mon, 06 Dec 2004 19:55:00 +0000 https://www.fplanque.com/tech/databases/mysql/mysql-features-by-version-breakdown/ I could not find anything like this on the net, so I thought I'd make my own chart and share it... ;) MySQL version 3.23.58 +InnoDB 4.0.22 4.1.7 5.0 Release date 11-sept-03 27-oct-04 23-oct-04 not stable yet Row level locking yes yes yes yes… https://www.fplanque.com/tech/databases/mysql/exporting-mysql-databases/ Fri, 03 Dec 2004 17:51:00 +0000 https://www.fplanque.com/tech/databases/mysql/exporting-mysql-databases/ PhpMyAdmin does a pretty decent job at exporting MySql database with their structure and/or their data to a plain SQL file. One thing bugged me though: it encloses every table/column/whatever name in backquotes like in Life is good! :D https://www.fplanque.com/tech/databases/mysql/another-lousy-php-mysql-charset-issue/ Fri, 03 Dec 2004 17:01:00 +0000 https://www.fplanque.com/tech/databases/mysql/another-lousy-php-mysql-charset-issue/ We had this quite interesting situation at work today: I export an UTF-8 MySQL database into an UTF_8 SQL file. I *binary* FTP the file over to him. He plays the SQL in PHPmyAdmin all configured for UTF-8. He then checks the data in PHPmyAdmin: special… https://www.fplanque.com/tech/databases/mysql/using-php-4-3-8-with-mysql-4-1/ Wed, 06 Oct 2004 14:52:00 +0000 https://www.fplanque.com/tech/databases/mysql/using-php-4-3-8-with-mysql-4-1/ Running an app under PHP 4.3.8 and trying to connect to a MySQL 4.1 database can be pretty frustrating. By default it gives you a message like this: "Client does not support authentication protocol requested by server; consider upgrading MySQL client".… https://www.fplanque.com/tech/databases/xml-vs-relational-databases/ Sun, 21 Sep 2003 03:48:00 +0000 https://www.fplanque.com/tech/databases/xml-vs-relational-databases/ Lately, I've seen quite a few people claiming XML to be the definitive way to store data, because it's supposed to be the most flexible format... Others claim RDBMSes have been providing an efficient solution to data storage for years or decades and… https://www.fplanque.com/tech/databases/mysql-and-oracle/ Sat, 26 Jul 2003 15:36:00 +0000 https://www.fplanque.com/tech/databases/mysql-and-oracle/ (via Cédric) Jim Gray [Links gone]: "Larry Ellison announced that Oracle is now running entirely on Linux. But he didn't say, "Incidentally we're going to run all of Oracle on MySQL on Linux." If you just connected the dots, that would be… https://www.fplanque.com/tech/databases/mysql/date-arithmetic-with-mysql/ Sun, 13 Jul 2003 00:22:00 +0000 https://www.fplanque.com/tech/databases/mysql/date-arithmetic-with-mysql/ MySQL offers pretty useful functions when you want to manipulate days: You can add a time interval to a date value with ADDDATE() or DATE_ADD() You can subtract a time interval from a date value witf DATE_SUB() You can find the interval between two… https://www.fplanque.com/tech/databases/mysql/commodity-databases-getting-serious-slowly/ Fri, 11 Jul 2003 17:35:00 +0000 https://www.fplanque.com/tech/databases/mysql/commodity-databases-getting-serious-slowly/ mySQL has been planing to implement stored procedures and triggers in mySQL 5 for some time now... But lately, it looks like it's just gonna get better than expected... Via Simon Willison (great blog!), from chromatic's wrap-up of OSCON day 3: Brian… https://www.fplanque.com/tech/databases/quote-of-the-day-data-access/ Fri, 11 Jul 2003 17:06:00 +0000 https://www.fplanque.com/tech/databases/quote-of-the-day-data-access/ Think of the history of data access strategies to come out of Microsoft. ODBC, RDO, DAO, ADO, OLEDB, now ADO.NET - All New! Are these technological imperatives? The result of an incompetent design group that needs to reinvent data access every goddamn… https://www.fplanque.com/tech/databases/mysql/mysql-3-23-is-making-me-sick/ Thu, 29 May 2003 21:49:00 +0000 https://www.fplanque.com/tech/databases/mysql/mysql-3-23-is-making-me-sick/ No referential integrity No transactions (at least not enabled by default so hosting providers would have them) No subqueries in DELETE statements No UNION statement (can you believe it?) and of course no triggers of any kind... Not that I think mySQL… https://www.fplanque.com/tech/databases/mysql/mysql-distinct-function-bug/ Sat, 10 May 2003 22:10:00 +0000 https://www.fplanque.com/tech/databases/mysql/mysql-distinct-function-bug/ Looks like mySQL is not able to to perform the DISTINCT selection in cases like this: SELECT DISTINCT YEAR(post_date), MONTH(post_date) FROM whatever1 INNER JOIN whatever2 ON field1 = field2 ORDER BY post_date This can be worked around, but it seems…