Question

I have a fairly complex query in SQL that performs a count across two tables. The query should look like this:

SELECT 
((SELECT COUNT(DISTINCT(pages.id)) AS `count` 
    FROM `pages` 
    INNER JOIN `pageRegions` ON pageRegions.pageId = pages.id 
    WHERE (MATCH (pages.name, pageRegions.contents) AGAINST ('+keyword*' IN BOOLEAN MODE))) + 
(SELECT COUNT(documents.id) AS `count` 
    FROM `documents` 
    INNER JOIN `files` ON files.id = documents.file 
    WHERE (MATCH (documents.name, 
              files.name, 
              files.extracted_text) AGAINST ('+keyword*' IN BOOLEAN MODE)))) AS count

Unfortunately when I have the following code using Zend_Db the query includes a load of additional columns so the addition of both queries obviously fails:

$total_count_select = $PagesTable->getAdapter()
    ->query('((' . $pages_total_count_select . ') + 
              (' . $legal_resources_total_count_select . ')
             ) AS count');

Where $pages_total_count_select and $legal_resources_total_count_select are both Zend_Db_Select objects.

I have tried using the columns() method to specify the columns I want on each select object like so:

$legal_resources_total_count_select->columns('COUNT(documents.id) AS count');

But this just appears to append onto the select query rather than only returning the column specified.

So the Zend generated query ends up looking like this:

SELECT ((SELECT `pages`.*, 
                 ((1.3 * (MATCH(pages.name) AGAINST ('+keyword*' IN BOOLEAN MODE))) + 
                       (0.8 * (MATCH(pageRegions.contents) AGAINST ('+keyword*' IN BOOLEAN MODE)))) AS `score`, 
                     `pages`.`name` AS `page_name`, 
                     `pages`.`id` AS `page_id`, 
                     `pageRegions`.*, 
                     COUNT(DISTINCT(pages.id)) AS `count`
         FROM `pages`
         INNER JOIN `pageRegions` ON pageRegions.pageId = pages.id
         WHERE (MATCH (pages.name, pageRegions.contents) AGAINST ('+keyword*' IN BOOLEAN MODE))
         ORDER BY `score` DESC)

            + 

          (SELECT `documents`.*,
                   ((1.3 * (MATCH(documents.title) AGAINST ('+keyword*' IN BOOLEAN MODE))) + 
                       (0.8 * (MATCH(documents.short_description, files.NAME, files.extracted_text) AGAINST ('+keyword*' IN BOOLEAN MODE)))) AS `score`,
                     `files`.*, 
                    COUNT(documents.id) AS `count`
         FROM `documents`
         INNER JOIN `files` ON files.id = documents.file
         WHERE (MATCH (documents.title, documents.short_description, files.name, files.extracted_text) AGAINST ('+keyword*' IN BOOLEAN MODE))
         ORDER BY `score` DESC)
        ) AS COUNT

How can I get rid of all the extra columns it is selecting?

Answer 1

You forgot one part of your code, where you construct the $pages_total_count_select and $legal_resources_total_count_select.

You missed one parameter in the way to build these, which is the array of columns you want, if you do not give it it takes table.*.

So just check the way you create the select and add one argument with an empty array.

UPDATE:
So you do:

$select = $this->select(Zend_Db_Table::SELECT_WITH_FROM_PART);

Just after that redo a ->from() call with your Zend_Db_Table ($this here) here you can specify the columns, so an empty array or the only one you want:

$select = $this->select(Zend_Db_Table::SELECT_WITH_FROM_PART);
$select->from($this, array(new Zend_Db_Expr('COUNT(documents.id) AS count')));