MySQL complex ORDER BY issue - mysql

I have a complicated ordering issue in my query.
Raw, Unordered Data:
+------+--------+-----------+
| id | job_id | action_id |
+------+--------+-----------+
| 1 | 2 | 1 |
| 2 | 2 | 2 |
| 3 | 1 | 1 |
| 4 | 2 | 3 |
| 5 | 4 | 1 |
| 6 | 1 | 2 |
| 7 | 3 | 1 |
| 8 | 3 | 2 |
| 9 | 4 | 2 |
+------+--------+-----------+
Required Ordering:
+------+--------+-----------+
| id | job_id | action_id |
+------+--------+-----------+
| 7 | 3 | 1 |
| 8 | 3 | 2 |
| | | | * blank lines added for clarity,
| 5 | 4 | 1 | not desired in actual data
| 9 | 4 | 2 |
| | | |
| 3 | 1 | 1 |
| 6 | 1 | 2 |
| | | |
| 1 | 2 | 1 |
| 2 | 2 | 2 |
| 4 | 2 | 3 |
+------+--------+-----------+
The theory behind this ordering:
the largest id is the most recently added entry
the most recent id with action_id of 1
followed by the entries with ascending action_ids that have the same job_id
then the next most recent action_id of 1
ad infinitum
EDIT: I'm not able to add columns to the table in order to aid in sorting, as I've seen in some other solutions to ordering questions.
Any help is greatly appreciated!

My best shot is this:
SELECT * FROM tbl
ORDER BY FIND_IN_SET(job_id,
(SELECT GROUP_CONCAT(job_id ORDER BY ID DESC)
FROM tbl WHERE action_id = 1));

I didn't find a way to do it easily, What do you think of the following code :
select c.id, c.job_id, c.action_id
from (select a.id, a.job_id, a.action_id, min(b.id) as related_id
from myTable a
inner join myTable b
on a.job_id=b.job_id
group by a.job_id) c
group by c.id
order by c.related_id desc, c.action_id

Related

Join 2 tables with distinct

I have 2 tables, follow and following
follow
+---------+----------------+
| user_id | follow_user_id |
+---------+----------------+
| 1 | 2 |
| 2 | 3 |
| 3 | 4 |
| 100 | 10 |
+---------+----------------+
following
+---------+-------------------+
| user_id | following_user_id |
+---------+-------------------+
| 1 | 2 |
| 3 | 4 |
| 4 | 6 |
| 200 | 500 |
+---------+-------------------+
I want to concat 2 tables without duplicate.
Here is the result that I want.
+---------+----------------+-----------+
| user_id | target_user_id | category |
+---------+----------------+-----------+
| 1 | 2 | follow |
| 2 | 3 | follow |
| 3 | 4 | follow |
| 4 | 6 | following |
| 100 | 10 | follow |
| 200 | 500 | following |
+---------+----------------+-----------+
Condition 1 - Remove duplicated row
Condition 2 - Have to add category column with each table's name
Condition 3 - If category is duplicated, it can be follow or following. it doesn't matter.
Condition 4 - follow_user_id as target_user_id and following_user_id as target_user_id
In this case, should I have to use join? or union?
Any suggestion, very appreciate.
Thanks!
Just use union and group by, the SQL as below:
select
user_id,target_user_id,min(tag) as category
from
(
select user_id,follow_user_id as target_user_id, 'follow' as tag from follow
union
select user_id,following_user_id as target_user_id, 'following' as tag from following
) tmp
group by
user_id,target_user_id
order by
user_id,target_user_id;
+---------+----------------+-----------+
| user_id | target_user_id | category |
+---------+----------------+-----------+
| 1 | 2 | follow |
| 2 | 3 | follow |
| 3 | 4 | follow |
| 4 | 6 | following |
| 100 | 10 | follow |
| 200 | 500 | following |
+---------+----------------+-----------+
6 rows in set (0.00 sec)

SQL Distinct a column with conditions

I'm working on a query where I need to count distinct CarId row when the column LocationId is not null and get all CarId if its null or 0 but the query that I tried distincts all the CarId even if its null
#LocId int
Select Count(distinct a.CarId) from VehicleDetails a
inner join VehicleDocuments b on a.DocId=b.DocId
left join VehicleShipmentDetails dpg on dpg.VehicleShipmentId= b.VehicleShipmentId
where b.LogicalDelete=0 and a.LogicalDelete=0
and (dpg.LocationId= #LocId or dpg.LocationId= 0 or dpg.LocationId is null)
| ID | CarId | LocationId | DateCreated |
|------+----------------+-----------------+---------------|
| 1 | 1 | 5 | 02/03/2019 |
| 2 | 2 | null | 01/14/2019 |
| 3 | 2 | 0 | 02/03/2019 |
| 4 | 2 | 5 | 12/30/2018 |
| 5 | 4 | 3 | 01/10/2019 |
| 6 | 3 | 5 | 02/14/2019 |
| 7 | 2 | 5 | 03/13/2019 |
Desired output:
| ID | CarId | LocationId | DateCreated |
+------+----------------+-----------------+---------------+
| 1 | 1 | 5 | 02/03/2019 |
| 2 | 2 | null | 01/14/2019 |
| 3 | 2 | 0 | 02/03/2019 |
| 4 | 2 | 5 | 03/13/2019 |
| 5 | 4 | 3 | 01/10/2019 |
| 6 | 3 | 5 | 02/14/2019 |
Current Output
| ID | CarId | LocationId | DateCreated |
+------+----------------+-----------------+---------------+
| 1 | 1 | 5 | 02/03/2019 |
| 2 | 2 | 5 | 01/14/2019 |
| 3 | 4 | 3 | 01/10/2019 |
| 4 | 3 | 5 | 02/14/2019 |
Im getting a count of 4 but i needed to have 6 as the Count
EDIT: My goal is to remove the row to Distinct CarId if the value of the LocationId is Null or 0 but on my Current code, It distincts all CarId that is null,0 and equals to #LocId
You can query something like this, replace your_table by your actual set of data.
SELECT ID, CardId, LocationId, DateCreated
FROM your_table as T
WHERE NOT EXISTS (SELECT *
FROM your_table as T1
WHERE T.ID > T1.ID AND T.CarID = T1.CarID)
In SQL, you can use the statement CASE to manage conditions (just like the "if then else" in other programming languages). In your case this function could help because you have two differents cases to handle.

Mysql Best way to query notifications like on stackoverflow

I have 4 tables:
comments
+----+-----------+--------------+-------+
| id | content | user_id | article_id |
+----+-----------+--------------+-------+
| 1 | Comment 1 | 2 | 5 |
| 2 | Comment 2 | 5 | 3 |
| 3 | Comment 3 | 1 | 6 |
| 4 | Comment 4 | 6 | 8 |
| 5 | Comment 5 | 1 | 6 |
| ...| ... | ... | ... |
+----------------+---------+------------+
votes
+----+----------+--------------+---+
| id | type | user_id | article_id |
+----+----------+--------------+---+
| 1 | 1 | 2 | 5 |
| 2 | 1 | 3 | 3 |
| 3 | 0 | 1 | 6 |
| 4 | 1 | 7 | 4 |
| 5 | 0 | 9 | 4 |
| 6 | 0 | 1 | 6 |
| ...| ... | ... | ... |
+------------+----------+----------+
notifications (object_id is the id of the vote|comment)
+----+----------+--------------+-------------+-------------+--------------+
| id | object_url| object_id |activitytype_id| sender_id | recipient_id |
+----+----------+------------+---------------+-------------+--------------+
| 1 | /../../.. | 1 | 2 | 2 | 6 |
| 2 | /../../.. | 2 | 2 | 3 | 2 |
| 3 | /../../.. | 1 | 1 | 2 | 7 |
| 3 | /../../.. | 2 | 1 | 5 | 2 |
| 3 | /../../.. | 3 | 1 | 1 | 3 |
| 3 | /../../.. | 3 | 3 | 1 | 2 |
| 3 | /../../.. | 4 | 2 | 7 | 8 |
| 3 | /../../.. | 5 | 3 | 9 | 1 |
| 3 | /../../.. | 6 | 3 | 1 | 5 |
| ...| ... | ... | ... | | |
+----+-----------+-----------+---------------+-------------+--------------+
activitytypes
+----+------------+
| id | label |
+----+------------+
| 1 | comment |
| 2 | vote up |
| 3 | vote down |
| ...| ... |
+-----------------+
I would like to get notifications like on stackoverflow.
I want to query the last notification (with comment content if the activity type is a comment or null if not) for every activitytype and object_url combinaison for a specific user.
For example I have 3 artiles A,B and C which all have 3 comments, 4 voteup and 2 votedown. How to get the last comment, voteup and votedown for every article ?
I have tried this query:
SELECT n.id, n.object_url , n.object_id, n.activitytype_id, IF(n.activitytypeId = 1,
(SELECT content FROM comments WHERE id=n.object_id), null) AS activitycontent
FROM notifications n WHERE n.recipient_id =1
GROUP BY n.activitytype_id,n.object_url
ORDER BY n.id DESC
But it doesn't work. Can anyone help ?
EDIT:
This following query in farhadamjady's answer gives me the first comment:
SELECT
n.id,
n.object_url,
n.object_id,
n.activitytype_id,
cm.content AS activitycontent
FROM
notifications n
LEFT OUTER JOIN `COMMENT` AS cm ON cm.id = n.object_id and n.activitytypeId = 1
WHERE
n.recipient_id = 1
GROUP BY
n.activitytype_id,
n.object_url
HAVING MAX(cm.id)
ORDER BY
n.id DESC
How can I change it to get the last ?
you should use left outer join like this :
SELECT
n.id,
n.object_url,
n.object_id,
n.activitytype_id,
cm.content AS activitycontent
FROM
notifications n
LEFT OUTER JOIN `COMMENT` AS cm ON cm.id = n.object_id and n.activitytypeId = 1
WHERE
n.recipient_id = 1
GROUP BY
n.activitytype_id,
n.object_url
HAVING MAX(cm.id)
ORDER BY
n.id DESC

MYSQL: How to get a group total repeating in column while keeping the grouping

Generated results that look like this:
------------------------
|GROUP A|GROUP B|AMOUNT|
------------------------
| A | 1 | 5 |
| A | 2 | 4 |
| B | 1 | 4 |
| B | 2 | 2 |
| B | 3 | 6 |
| C | 1 | 1 |
| C | 2 | 4 |
------------------------
Looking to sum in a new column the total of GROUP A that repeats along GROUP B:
---------------------------------------
|GROUP A|GROUP B|AMOUNT|SUM of GROUP A|
---------------------------------------
| A | 1 | 5 | 9 |
| A | 2 | 4 | 9 |
| B | 1 | 4 | 12 |
| B | 2 | 2 | 12 |
| B | 3 | 6 | 12 |
| C | 1 | 1 | 5 |
| C | 2 | 4 | 5 |
---------------------------------------
I'm using several derived and joined tables, so hoping this would be easy enough to calculate within the current SELECT statement or another derived table. Any ideas? Can't add additional rows using WITH ROLLUP modifier.
Try something like this:
SELECT t1.*, SumOfGroup_A
FROM mytable AS t1
INNER JOIN (
SELECT GROUP_A, SUM(AMOUNT) AS SumOfGroup_A
FROM mytable
GROUP BY GROUP_A
) t2 ON t1.GROUP_A = t2.GROUP_A
Demo here

select sum of product price for every 1 id productcategory

i want to find solution for my query problem. I need to find the SUM of all priceProduct*quantity and separated with each of productcategory. I have already made a query, but it takes longer time to executed it. this is my query,
SELECT
pb.ProductCategoryID,
pb.ProductCategoryDescription,
(SELECT
SUM((SELECT pd.HPP FROM `price details` pd WHERE pd.ProductID = pdt.ProductID ORDER BY pd.PriceDetailID DESC LIMIT 1)*
(SELECT StockProductBallance FROM `stock product` sp WHERE sp.ProductID = pdt.ProductID ORDER BY sp.StockProductID DESC LIMIT 1))
FROM product pdt
WHERE pdt.ProductCategoryID = pb.ProductCategoryID
) AS Total
FROM `product category` pb
GROUP BY pb.ProductCategoryID
this my example table
table product:
+------+-------+
| id_p | id_pc |
+------+-------+
| 1 | 3 |
| 2 | 4 |
| 3 | 3 |
| 4 | 4 |
+------+-------+
table productcategory:
+-------+---------+
| id_pc | pc_name |
+-------+---------+
| 3 | new_pc |
| 4 | old_pc |
+-------+---------+
table price details:
+---------------+------+-----+
| PriceDetailID | id_p | hpp |
+---------------+------+-----+
| 1 | 1 | 100 |
| 2 | 1 | 110 |
| 3 | 1 | 120 |
| 4 | 2 | 200 |
| 5 | 2 | 210 |
| 6 | 2 | 220 |
+---------------+------+-----+
table stockProduct:
+-----------------+------+---------------+
| id_stockProduct | id_p | stockballance |
+-----------------+------+---------------+
| 1 | 1 | 10 |
| 2 | 1 | 11 |
| 3 | 1 | 12 |
| 4 | 2 | 20 |
| 5 | 2 | 21 |
| 6 | 2 | 22 |
+-----------------+------+---------------+
Really need your help guys, for better query..