Back when WordPress was pretty young there’s some loopholes that enable hackers to inject unauthorized and dangerous HTML code into your website pages, thus promoting the distribution of malware that damages the end users computer. I was once there and got penalized by Google for one of my sites. However, they are gentle enough to …
A quick tip — I kind of have the feeling that I’ve covered this before, but whatever — well, just the simple SQL query below will do: CREATE TABLE temp SELECT id, COUNT(id) FROM `book` GROUP BY isbn, subject HAVING COUNT(id) > 1 Wherein each combination of column isbn and column subject in each of …
Today I’m optimizing some MySQL tables with large number of records — 1 million of them, yeah, I know — , it’s simply impossible to deal with such big chunks of data without proper indexing. So there I was, adding a variety of indexes to a few of the columns. It’s expected it’d take a …
MySQL: Huge Table Not Responding after Adding Index Read More »
PHP can execute shell commands, which means it can compress selected files into a archive or zipped package: exec(‘tar zcf files.tar.gz file1 file2 file3’); Or make a zip file: exec(‘zip files.zip file1 file2 file3’); You can then use PHP to render and supply download of the zip file to your visitor.
There are times when you need to store a file (such as one that you sell for profit) outside of the document root of your domain and let the buyers download it via a PHP script so as to hide the real path, web address or URL to that file. Use of this approach enables …
PHP: Hide the Real File URL and Provide Download via a PHP Script Read More »
Well, MySQL doesn’t actually have anything called Foreign Key, it’s just my way of saying a alien column from another table. Let’s say 2 tables are related, 1 is books and the other is subjects. Any book in book table falls into one of the subjects, thus having a subject column referencing the ID of …
MySQL: Counting Number of Records or Rows by a Foreign Column (from Another Table) Read More »
As MySQL doesn’t have inherent support for updating more than one rows or records with a single update query as it does for insert query, in a situation which needs us to perform updating to tens of thousands or even millions of records, one update query for each row seems to be too much. Reducing …
MySQL: Update Multiple Rows or Records with One Single Query Read More »
To find / identify a part of an original string and replace it with another string in a SQL query with MySQL, use REPLACE(), the string replace function. For example, you may want to replace all spaces in one of the varchar or text fields to a single dash: UPDATE `table` SET `old_field` = REPLACE(`old_field`, …
MySQL: Replace Substring with Another String – the MySQL String Replace Function Read More »
One of the principles of data integrity is to reduce data redundancy as much as possible and wipe out any duplicate database table entries. Another reason for this is that you need to add unique indexing to one or a group of table columns and you need the one column or combination of columns to …
MySQL: Deleting Duplicate Rows or Records | Selecting Unique Rows into A New Table Read More »
I joined Dynadot at the commencement of .tel domains and tried my luck to get some domainers to register a domain with them. Maybe it’s because they just don’t care about expanding via affiliates, the system might be a little buggy or not so affiliate friendly in that once the referred friend signed up an …
Dynadot Affiliate Program Review – Not Worth the While Read More »
Amazon Affiliate system does a great job presenting you a variety of ways to make associate affiliate links so that you can take credit of their products that you have referred to others. Today I messed around a little bit with their generators and finally come to a simple solution to generate affiliate links dynamically …
Proper indexing can work wonders for large databases in query efficiency, it’s a compromise of disk storage in exchange for sorting speed. For databases with millions of records, indexing takes considerable amount of disk storage, and, AGONIZING lengths of time to create. I recently compiled a database with one table mytable consisting of over 4 …
Just imagine, that much amounts of money just vaporized into thin air at a cause of nothing. Company Bankruptcy date Total assets pre-bankruptcy (in millions) Lehman Brothers Holdings, Inc. 9/15/2008 $691,063 Worldcom, Inc.1 7/21/2002 $103,914 Enron Corp.2 12/2/2001 $65,503 Conesco, Inc. 12/17/2002 $61,392 Pacific Gas and Electric Co. 4/06/2001 $36,152 Texaco, Inc. 4/12/1987 $34,940 Financial …
Naturally, you’d never expect an AdSense ad of a site to appear on itself. But this I just encountered, indicates an inherent *bug* of AdWords. Or is it? But I’ll never understand otherwise. What’s the point? Maybe there’s an option for the AdWords advertiser to opt out of his advertisement listing being published on his …
While you can always fulfill tasks such as creating a new table out of existing ones in MySQL by the help of PHP, it’d be much faster and way more efficient with native SQL queries. Consider when you need to combine a few tables into one, more precisely, you need just certain fields / columns …
I’ve been DreamHost since 2006 and that’s more than 3 years of hosting experience with them on a shared plan ($9.95 / month). For those who’d prefer scanning instead of reading, I’ll sum up my points in short lists: Pros Affordable price with generous offerings in disk storage and monthly transfer. Full pack of features …
DreamHost Review: Pros and Cons plus Uptime Charts Read More »
A good practice of increasing SQL efficiency is to reduce the number of separate queries as much as possible. In a situation where you want a row updated if it exists and inserted if it doesn’t may take a newbie MySQL developer to write 2 independent queries, namely: first, check if the row exists with …
MySQL: Insert if doesn’t exist otherwise update the existing row Read More »
Your mouse suddenly got offline by itself and you only got half an hour before the presentation yet the PPT still needs a few adjustments. Thank God you know how to use computer without a mouse. A retiring computer is hardly environment-neutral, you need to dispose them properly as various parts of it contain toxic …
Programmers write programs for users so certain processes in the workflow can be automated for efficiency and correctness. As such, to improve the programming efficiency of similar projects for addressing a common set of related problems, such as the need for content management system in web authoring, some programmers write programming frameworks to integrate the …
VeriSign, the central registry for COM domains, recently released a new tool called Data Analyzer. Data Analyzer allows you to check the amount of traffic a domain name gets, even if the domain does not exist. So just the kind of traffic analysis tool that examines the type-in traffic of unregistered domains (.COM). Well, not …
