PHP - SQL Join Query - php

Question

I have this MySQL Structure:
CREATE TABLE Fields (
ID INT(10) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
ForUser VARCHAR(255) NOT NULL,
ForCategory VARCHAR(100) NOT NULL,
FieldName VARCHAR(100) NOT NULL
);
CREATE TABLE Content (
ID INT(10) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
ForUser VARCHAR(255) NOT NULL,
ForCategory VARCHAR(100) NOT NULL,
ForField VARCHAR(100) NOT NULL,
FieldContent VARCHAR(255) NOT NULL
);
Now I want to make SQL Query that list results in HTML Table. As Head Table I want to list FieldName from Fields, and as Table Body I want to list FieldContent from Content. Also in WHERE clause must be ForUser AND ForCategory... to list Content for each field. I'm tried with SQL Join, but I'm spend 3 hours without success. Can, please, someone write me an example how to display this.

Answer 1

If I understand this request correctly (you're a little light on detail), you will need a use a few components to achieve your goal:
Two sql queries (one for the table header and one for the table body)
Some php or another scripting language to display your results as html.
Your first query will just bring back the field names, filtered by user and category:
select ID, FieldName from Fields where ForUser = 'some_user' and ForCategory = 'some_category' order by ID;
IN your php or other code, you need to iterate through the results and display each result wrapped in the html tags, eg:
echo '<table><tr>';
$fields = # mysql_query ("select ID, FieldName from Fields where ForUser = 'some_user' and ForCategory = 'some_category' order by ID;", $connection);
while ($fields_result = mysql_fetch_assoc($fields)) {
echo '<th>' . $fields_result['FieldName'] . '</th>;
}
echo '</tr>';
Then run a second sql query to bring back the contents:
select
FieldContent
from
Content c join
Fields f on
c.ForField = f.FieldName and
c.ForUser = f.ForUser and
c.ForCategory = f.For Category
where
f.ForUser = 'some_user' and
f.ForCategory = 'some_category'
order by ID;
And in a similar fashion, iterate through the results in php to build the content rows in the table.
Note that I'm ordering on the PK in the Fields table to ensure that the content comes back in the same order as the fields. This approach might not suffice, you may need to add a "sequence" field if you need a specific field order.
Also note my prevous comment that you would do well to revise your database structure. You don't need to repeat all the fields in the Content table, you can just add a foreign key referencing the ID of the Field record

Answer 2

Table join query:
SELECT
a.ID,
a.ForUser,
b.ForUser,
a.ForCategory,
b.ForCategory,
a.FieldName,
b.ForField,
b.FieldContent
FROM
Fields a,
Content b
WHERE
a.ForUser = '' AND b.ForCategory = ''