In my query below I am not getting the desired result. I want the results to sort according to the latest event occurrence based on two different date fields of two different tables. Let's see the query first.
SELECT R1.swp_to, R1.swp_type, R1.swp_date, M.mem_fname, M.mem_lname, M.mem_last_activity, DP.dp_photo, GREATEST(R1.swp_date, R2.swp_date) FROM swipes AS R1
LEFT JOIN swipes AS R2 ON(R1.swp_to = R2.swp_by AND R2.swp_to = R1.swp_by AND R2.swp_type <> 'left')
LEFT JOIN members AS M ON(R1.swp_to = M.mem_id)
LEFT JOIN display_photos AS DP ON(R1.swp_to = DP.dp_mem AND DP.dp_index = 1)
LEFT JOIN messages as MSG ON ((R1.swp_to = MSG.msg_from OR R1.swp_to = MSG.msg_to) AND (R1.swp_by = MSG.msg_from OR R1.swp_by = MSG.msg_to))
WHERE R1.swp_by = :mem AND R2.swp_by IS NOT NULL AND R1.swp_type <> 'left'
ORDER BY IF(MSG.msg_time IS NULL, 0, 1), R1.swp_date
Here in the ORDER BY statement we can see that there are two TIME fields msg_time and swp_date. Whenever there is a new match swp_date updates and when there is a new message msg_time updates. The records fetched using this query must be sorted as per the latest event occurrence (whichever date is the earliest of the two). My current ORDER BY statements does not fulfill the requirement. What am I missing here?
You can use the function GREATEST():
ORDER BY GREATEST(COALESCE(MSG.msg_time, R1.swp_date), R1.swp_date) DESC
Related
I have this query:
SELECT `y78f2_students`.`firstname` , `y78f2_students`.`lastName` , `y78f2_students`.`student_id`,`y78f2_attendance`.`is_present`, `y78f2_attendance`.`note`, `y78f2_attendance`.`thedate`
FROM `y78f2_students`
INNER JOIN `y78f2_enrolls` ON `y78f2_enrolls`.`student_id` = `y78f2_students`.`student_id`
INNER JOIN `y78f2_attendance` ON `y78f2_attendance`.`student_id` = `y78f2_students`.`student_id`
WHERE `y78f2_enrolls`.`term` = 'Term 2 2016'
AND `y78f2_enrolls`.`crn_class` = 'Math1R1'
and `y78f2_attendance`.`thedate` = '2016-01-24'
ORDER BY thedate desc
This query returns only the rows where the date is '2016-01-24'. Currently that is just one row: http://i.imgur.com/jRTBqQ0.png
I need to show all rows where term = 'Term 2 2016' and crn_class` = 'Math1R1' and also where the date is not set as yet. In order words I want to show all students in the class and if the date is not set for these students yet, it will show null.
This is what I would like: http://i.imgur.com/jmsuSF5.png
So in summary I need to show rows where the clause is met and those where the date would be null or not exist yet.
How can I write this query?
Try moving the conditions related to the joined tables from the end of the query, up to the table's respective ON clause for each join. Also, if you would like to return records for which no row yet exists in the y78f2_attendance table, that table should be LEFT OUTER joined, not INNER joined.
SELECT `y78f2_students`.`firstname` , `y78f2_students`.`lastName`,
`y78f2_students`.`student_id`,`y78f2_attendance`.`is_present`,
`y78f2_attendance`.`note`, `y78f2_attendance`.`thedate`
FROM `y78f2_students`
INNER JOIN `y78f2_enrolls` ON
`y78f2_enrolls`.`student_id` = `y78f2_students`.`student_id`
AND `y78f2_enrolls`.`crn_class` = 'Math1R1'
LEFT OUTER JOIN `y78f2_attendance` ON
`y78f2_attendance`.`student_id` = `y78f2_students`.`student_id`
AND (`y78f2_attendance`.`thedate` IS NULL OR `y78f2_attendance`.`thedate` = '2016-01-24')
WHERE `y78f2_enrolls`.`term` = 'Term 2 2016'
ORDER BY thedate desc
I am trying to only get rows from video_index that belongs to a specific category from category_video_rel and order the result by COUNT of view count. This is the query I'm using:
SELECT
COUNT(DISTINCT view_count.id) AS count,
view_count.remove,
view_count.video_id,
video_index.id AS video_id,
video_index.active,
video_index.remove,
video_index.title AS title,
video_index.date_published AS date_published,
category_video_rel.active,
category_video_rel.remove,
category_video_rel.video_id AS cv_video_id,
category_video_rel.category_id AS category_id
FROM
view_count JOIN video_index
ON view_count.video_id = video_index.id,
category_video_rel JOIN video_index AS v
ON category_video_rel.video_id = v.id
WHERE
view_count.remove = '0' AND
video_index.active = '1' AND
video_index.remove = '0' AND
video_index.date_published <= '$current_time' AND
category_video_rel.category_id = '$category_id' AND
category_video_rel.active = '1' AND
category_video_rel.remove = '0'
GROUP BY
video_index.id
ORDER BY
count DESC
The problem is it outputs all the rows from video_index with a view count higher than 0 regardless of the category. Basically, it's ignoring "category_video_rel.category_id = '$category_id'" in the WHERE condition.
I have no idea what I'm doing wrong, please help.
Your FROM clause is mixing old style joins and new style joins
Instead try:
FROM
view_count JOIN video_index
ON view_count.video_id = video_index.id
JOIN category_video_rel
ON category_video_rel.video_id = video_index.id
The following code returns an incorrect value for the sumHours field. It appears to prepare the sumHours field then once the GROUP BY runs, sum the sums together.
SELECT mmr_ID, mmr_projectName, SUM(mmr_hoursWorked.mmr_hoursWorked_hours) AS sumHours
FROM mmr
LEFT JOIN mmr_hoursWorked
ON mmr.mmr_ID = mmr_hoursWorked.mmr_hoursWorked_project AND mmr_hoursWorked.mmr_hoursWorked_mm = "P90826"
LEFT JOIN mmr_notes
ON mmr.mmr_ID = mmr_notes.mmr_notes_MMR_ref AND mmr_notes.mmr_notes_author = "P90826"
WHERE mmr_mmAssigned = "P90826" AND mmr_projectStatus != 1 OR mmr_notes.mmr_notes_author = "P90826" AND mmr_projectStatus != 1
GROUP BY mmr_ID
Actual Results
mmr_ID - 35
mmr_projectName - Project A
sumHours - 140.2
Expected Results
mmr_ID - 35
mmr_projectName - Project A
sumHours - 35.05
Due to JOIN statements combination of results are returned, so you should handle aggregates and joins separately. Try this:
SELECT t.*
FROM
(
SELECT mmr_ID, mmr_projectName, SUM(mmr_hoursWorked.mmr_hoursWorked_hours) AS sumHours
FROM mmr
LEFT JOIN mmr_hoursWorked
ON mmr.mmr_ID = mmr_hoursWorked.mmr_hoursWorked_project AND mmr_hoursWorked.mmr_hoursWorked_mm = 'P90826'
WHERE mmr_projectStatus != 1 AND mmr_mmAssigned = 'P90826'
GROUP BY mmr_ID, mmr_projectName, mmr_mmAssigned
) t
LEFT JOIN mmr_notes
ON t.mmr_ID = mmr_notes.mmr_notes_MMR_ref
WHERE mmr_notes.mmr_notes_author = 'P90826';
The issue was corrected by normalizing the database. The mmr_notes table was integrated into the mmr_hoursWorked table since it only had one unique field.
I have the following code:
$params = array();
$query_questions_visibles = questionTable::getInstance()->createQuery("q")
->select("q.*, ua.*, a.*, u.*, c.*")
->leftJoin("q.Answers a")
->leftJoin("a.UserAnswers ua")
->Where("q.blocked = false")
->andWhere("ua.user_id = :user_id")
->orderBy("q.id DESC")
->groupBy("q.id");
//Subquery --> Calculates when a question is active or not
$format = sfConfig::get("app_datetime_format");
$active_time = date($format, strtotime(sfConfig::get("app_question_active_time")));
$sub_query_is_active = $query_questions_visibles->createSubQuery()
->select("MAX(ua0.created_at)")
->from("question q0")
->leftJoin("q0.Answers a0")
->leftJoin("a0.UserAnswers ua0")
->where("q0.id = q.id");
$query_questions_visibles->addSelect("COALESCE((".$sub_query_is_active.") > :active_time, false) as Active");
//Set param values
$params["user_id"] = $guardUser->id;
$params["active_time"] = $active_time;
$result = $query_questions_visibles->execute($params);
The previous code works as expected.
Generated SQL is complete and works:
SELECT q.id AS q__id, q.user_id AS q__user_id, q.category_id AS q__category_id, q.gender_restriction AS q__gender_restriction, q.question AS q_question, q.photo AS q_photo, q.latitude AS q_latitude, q.longitude AS q_longitude, q.multiple AS q_multiple, q.blocked AS q_blocked, q.created_at AS q__created_at, q.updated_at AS q__updated_at, a.id AS a__id, a.question_id AS a__question_id, a.text AS a_text, u.id AS u_id, u.user_id AS u__user_id, u.answer_id AS u__answer_id, u.created_at AS u__created_at, u.updated_at AS u__updated_at, COALESCE((SELECT MAX(u2.created_at) AS u2__0 FROM question q2 LEFT JOIN answer a2 ON q2.id = a2.question_id LEFT JOIN user_answer u2 ON a2.id = u2.answer_id WHERE (q2.id = q.id)) > :active_time, 0) AS u2__0 FROM question q LEFT JOIN answer a ON q.id = a.question_id LEFT JOIN user_answer u ON a.id = u.answer_id WHERE (q.blocked = 0 AND u.user_id = :user_id) GROUP BY q.id ORDER BY q.id DESC
But, if I want to limit results, I modify the end lines as:
$query_questions_visibles->limit(10);
$result = $query_questions_visibles->execute($params);
Doctrine throws an error:
SQLSTATE[HY093]: Invalid parameter number: number of bound variables does not match number of tokens
at Doctrine_Connection->execute('SELECT DISTINCT q2.id FROM question q2 LEFT JOIN answer a2 ON q2.id = a2.question_id LEFT JOIN user_answer u2 ON a2.id = u2.answer_id WHERE q2.blocked = 0 AND u2.user_id = :user_id GROUP BY q2.id ORDER BY q2.id DESC LIMIT 10', array('user_id' => '1', 'active_time' => '2013-03-17 17:12:12')) in SF_ROOT_DIR\lib\vendor\symfony\lib\plugins\sfDoctrinePlugin\lib\vendor\doctrine\Doctrine\Query.php line 1290 ...
My purpose is only limit the query to 10 results, ¿where is my Subquery with COALESCE and MAX functions? ¿Why there's a SELECT DISTINCT who I never specified? ¿Why is selecting only q.id?
I spend all day trying to figure it out, i have no answer...
Any Ideas why setting a limit causes this?
When you add limit() to the Doctrine query then the Doctrine internals create in fact two queries. The first one select a limited set of distinct ids based on the conditions of your query. The second query selects the actual objects limiting the select to the ids found with the first query.
The problem with your query is that you use params inside of the select part, which is not used in the first query.
The only solutuion that comes to my mind is to add the value of the active_time parameter directly to the select part, without using the named param. It might not be the nicest solution but I can't think of a different one right now. The addSelect() does not accept additional parameters like where() does which could fix the issue (with where() you can use: ->where('field > ?', $value)).
I'm having problems with an SQL query used to display custom profile fields and any (optional) corresponding values.
Here is the SQL query I'm using:
SELECT pf.`id`, pf.`name`, pv.`value` FROM `profile_fields` AS pf
LEFT JOIN `profile_values` AS pv ON (pf.`id` = pv.`field_id`)
WHERE (pf.`site_id` = '0' OR pf.`site_id` = '%d') AND (pv.`user_id` = '%d' OR pv.`user_id` IS NULL)
ORDER BY pf.`order` ASC
The problem I'm having is that any columns with no corresponding profile_values records are not shown at all, when they should show, but just with an empty value.
Many thanks!
Try moving the profile values conditions to the JOIN statement:
SELECT pf.`id`, pf.`name`, pv.`value` FROM `profile_fields` AS pf
LEFT JOIN `profile_values` AS pv ON (
pf.`id` = pv.`field_id` AND
(pv.`user_id` = '%d' OR pv.`user_id` IS NULL)
)
WHERE (pf.`site_id` = '0' OR pf.`site_id` = '%d')
ORDER BY pf.`order` ASC