The Filipino Programmer » Database

mySQL Super-tip! How to comma-delimit or comma-separate your query results!

admin — Tue, 17 Aug 2010 20:49:35 +0000

_Problem_: Help! I’d like to make it so my query results to be a comma delimited format!

_Answer_: No problemo! Simply use mySQL’s group_concat function and you’ll get your results in comma delimited values!

SELECT GROUP_CONCAT(id) FROM users WHERE authenticated=1 ORDER BY NULL LIMIT 1 Note: (Optional) ORDER BY NULL is used to prevent unnecessary sorting with filesort

This query would result to: 1,3,4,6,11

That’s It! This is pretty useful when you are going to use the SELECT… IN statement for your subqueries.

mySQL Super-tip! Use LIMIT and OFFSET to paginate your SELECT statements!

admin — Tue, 27 Apr 2010 20:51:50 +0000

Awesome, it seems that mySQL now supports the OFFSET clause.

This is very useful for paginating your SQL statements.

The following will return the first 10 entries of your select statement:

“SELECT field FROM table LIMIT 10″

This, on the otherhand, will OFFSET your result by 10, selecting your entries #10-20:

“SELECT field FROM table LIMIT 10 OFFSET 10″

Here’s an example of how to capture entries #10-30:

“SELECT field FROM table LIMIT 20 OFFSET 10″

Things just keeps on getting easier and easier!

A MySQL query to find & replace text in your database

admin — Fri, 03 Jul 2009 18:11:27 +0000

Problem: Help! I need to replace some words with something else in my database.

Solution: Use the replace() function to do a search and replace query.

UPDATE table_name SET table_field=REPLACE(table_field,"old_text","new_text");

Here’s an example:

UPDATE wp_posts SET post_content=REPLACE(post_content,"localhost","www.cybervaldez.com");

Easy as pie!

How to: Remove those nasty question marks with a diamond symbols that appears in your website

admin — Thu, 02 Jul 2009 22:33:56 +0000

Problem: Help! I’ve pasted some text from Microsoft Word and saved it to my SQL database! Now whenever I print my text there’s a bunch of diamonds with a question mark symbols appearing!

Solution: You are trying to display characters that are outside your page’s character set, you have to tell your browser that you need to display characters from the iso-8859-1 set so it will know how to render them correctly.

Simply put the following inside your website’s

and in PHP(or any other similar language), simply put this at the top of your page(for other languages, look for an identical function):

and voila! Your characters should now be displayed correctly.

Super Tool: (Probably) the best SQLite Editor/IDE for web development and production use

admin — Fri, 26 Jun 2009 18:18:37 +0000

I really love SQLite. It’s lightweight and got a really small footprint. I use it as my database initially when i’m creating web applications(I then move to mySQL during production), the only issue I have is the lack of IDE for working with it. Of course there’s SQLite Administrator, i’m just not into the idea of installing a software especially with SQLite being small(I prefer not to cramp up as much software possible in my Windows).

This is where sqlite-manager comes along. It’s a 100kb plugin for Firefox(which also means cross compatibility with other OS), it’s a great complement to SQLite’s lightweight and small footprint. If you need to work with the database, you simply fire up sqlite-manager from the Tools menu.

That’s It!