Querying db for missing table row.

[Jolten]

Hi,

I want to query two tables in my database.

Table 1 is a list of images and artists (image #, artistuser, imagetitle).
When a user comments on one of these images Table 2 is updated with the username and comment (Image #, commentuser, comment).

I'd like to write a loop to display to the user every image in Table 1 that does not have a corresponding comment row in Table 2. I can work out the loop but I'm lost on writing the sql query where a row is nonexistant.

Basically I needsomething like:
where table1.image# = table2.image# and $bbuserinfo[username] does not exist in table2.commentuser

Is this possible?

Any help would be appreciated.

[Tekton]

Could you do an IF and see if the value is == null or == ""?

[Jolten]

I don't know. Can i?

[Tekton]

Have you tried??

PHP Code:

if ($whatever == null || $whatever == ""){

} 


[Jolten]

Thanks Tekton

Here's the run down. A user rates an item and when they rate this item, the item #, rating, and username are placed into the database.

What I need to to write an sql query that displays all items the user has not rated, therefore I need a query that basically states... table.userfield does not contain $bbuserinfo[username].

I can get table.userfield = '$bbuserinfo[username]' to display all the items a user has rated. What I'm having trouble with is getting items the user has NOT rated. using table.userfield != '$bbuserinfo[username]' results in all items showing and in fact all items showing twice for some reason. Including those items the user has rated.

I don't know if I can use if conditionals within an sql query and I'm not certain how to right the query if I can use conditionals.

[Jolten]

oop.. nevermind I got it sorted. Queried for existing then wrote a couple php conditionals.

Thanks for the help Tekton