Question

The following sql statement:

SELECT 
    profile_pic
FROM
    (`member`) 
WHERE 
    `active` = 1

produces the following result:

profile_pic
    1_1345694557.jpg
    <blank_value>
    <blank_value>
    <blank_value>

I want the “blank values” to default to “no_prof_thumb.jpg”.

So I created this statement:

SELECT 
    REPLACE(IF (CHAR_LENGTH(profile_pic) > 0, profile_pic, 'no_prof.jpg' ), '.jpg', '_thumb.jpg') AS profile_pic 
FROM 
    (`member`) 
WHERE 
    `active` = 1

Here is the result:

profile_pic
1_1345694557_thumb.jpg
no_prof_thumb.jpg
no_prof_thumb_thumb.jpg
no_prof_thumb_thumb_thumb.jpg

Why does _thumb keep appending itself to the value in the previous row?

How should I fix my expression?

---

Update

This issue occurs on a GoDaddy mySQL database. I reproduce when it connecting remotely through SQLyog and when I log into GoDaddy and run it through phpMyAdmin.

However, I cannot reproduce locally nor on sqlFiddle.
So it must be some kind of configuration issue.

Answer 1

You needed to use IF outside the REPLACE statement like this.

SELECT 
    IF (profile_pic = '', 'no_prof.jpg', 
        REPLACE(profile_pic, '.jpg', '_thumb.jpg')) AS profile_pic 
FROM 
    (`member`) 
WHERE 
    `active` = 1

You can also use CASE statement instead of IF like this:

SELECT
  CASE  profile_pic
    WHEN '' THEN 'no_prof.jpg'
    ELSE REPLACE(profile_pic, '.jpg', '_thumb.jpg')
  END AS profile_pic
FROM member
WHERE active = 1;

See this fiddle