Joining tables via SQL

Question

I am trying to join two tables.  I have a documents and uploads, of which user is common.  For the user, I would like results put out from the tables where it is owned by the same user.  So if they have two records in uploads, and one in documents, it puts all of those out.  Also, how do I put out the data.  For example, if it is a document, then access the document variables?
$sql="SELECT *
FROM documents
FULL JOIN uploads
ON documents.user = uploads.user";
Error:
Sql Error: Unknown column 'documents.user' in 'on clause'

Answer 1

I've updated it:
$sql="SELECT *
FROM documents, uploads
WHERE documents.user = uploads.user AND documents.user='$profileIDNum'";
I get two test text files, but they have different date stamps some how.  There is only one Test Text file in uploads.  In documents, there are two records.  I noticed when I change one of the dates for the records in documents, it changes the date for the Test Text file listed.