Hi Elliot,
Yeah - I've just resolved it! I ended up using SS's SQL query class and used this solution:
$sqlQuery = new SQLQuery();
$sqlQuery->setFrom('course');
$sqlQuery->selectField('Title');
$sqlQuery->addInnerJoin('course_coursecategories','"course_coursecategories"."CourseID" = "course"."ID"');
$sqlQuery->addWhere("course_coursecategories.CourseCategoryID = $courseCategoryId");
$rawSQL = $sqlQuery->sql();
// Execute and return a Query object
$result = $sqlQuery->execute();
var_dump($result);
The docs for anyone else in a similar fix is: http://doc.silverstripe.org/framework/en/reference/sqlquery
Thanks for your assistance.
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