We are a table called ticketing that tracks all the service tickets. One ticket can lead to another ticket which leads to another ticket indicated by the replaced_by_ticket_id field below
| ticket_id | is_current | replaced_by_ticket_id |
|-----------|------------|-----------------------|
| 134 | 0 | 240 |
| 240 | 0 | 321 |
| 321 | 1 | Null |
| 34 | 0 | 93 |
| 25 | 0 | 16 |
| 16 | 0 | 25 |
| 93 | 1 | Null |
How do I write a query to get the number of tickets leading to the current ones (321 & 93)? I mean I could join the table by itself, but there is no way of knowing how many times to join. Plus different tickets have different number of levels.
Here is the expected result of the query
| ticket_id | total_tickets |
|-----------|---------------|
| 321 | 3 |
| 93 | 4 |
What is the best way to do it?
You can use a recursive query; the trick is to keep track of the original "current" ticket, so you can aggregate by that in the outer query.
So:
with cte as (
select ticket_id, ticket_id as parent_id from ticketing where is_current = 1
union all
select c.ticket_id, t.ticket_id
from ticket t
inner join cte c on c.parent_id = t.replaced_by_ticket_id
)
select ticket_id, count(*) total_tickets
from cte
group by ticket_id
Related
I have a database with tables that represents "edits" to "pages". Every edit has an ID and a timestamp and a "status", which has certain discrete values. Pages have IDs and also have "categories".
I wish to find the number of pages with each status within a given category, taking into account only the state as of the most recent edit.
Edits:
+---------+---------+-----------+--------+
| edit_id | page_id | edit_time | status |
+---------+---------+-----------+--------+
| 1 | 10 | 20210502 | 90 |
| 2 | 10 | 20210503 | 91 |
| 3 | 20 | 20210504 | 91 |
| 4 | 30 | 20210504 | 90 |
| 5 | 30 | 20210505 | 92 |
| 6 | 40 | 20210505 | 90 |
| 7 | 50 | 20210503 | 90 |
+---------+---------+-----------+--------+
Pages:
+---------+--------+
| page_id | cat_id |
+---------+--------+
| 10 | 100 |
| 20 | 100 |
| 30 | 100 |
| 40 | 200 |
+---------+--------+
I want to get, for category 100:
+--------+-------+
| stat | count |
+--------+-------+
| 90 | 1 |
| 91 | 2 |
| 92 | 1 |
+--------+-------+
Page 10 and 30 have two edits, but the later one "overrides" the first one, so only the edits with status 91 and 92 are counted. Pages 20 and 40 account for one of 91 and 90 each and page 50 is in the wrong category so it doesn't feature.
I have tried the following, but it doesn't seem to work. The idea was to select the max (i.e. latest) edit for each page with the right category. Then join that to the edit table and group by the status and count the rows:
SELECT stat, COUNT(*)
FROM edits as out_e
INNER JOIN (
SELECT edit_id, page_id, max(edit_time) as last_edit
FROM edits
INNER JOIN pages on edit_page_id = page_id
WHERE cat_id = 100
GROUP BY page_id
) in_e ON out_e.edit_id = in_e.edit_id
GROUP BY stat
ORDER BY stat;
"""
For example in this fiddle: http://sqlfiddle.com/#!9/42f2ed/1
The result is:
+--------+-------+
| stat | count |
+--------+-------+
| 90 | 3 |
| 91 | 1 |
+--------+-------+
What is the correct way to get this information?
SELECT cat_id, stat, COUNT(*) cnt
FROM pages
JOIN edits ON pages.page_id = edits.edit_page_id
JOIN ( SELECT edit_page_id, MAX(edit_time) edit_time
FROM edits
GROUP BY edit_page_id ) last_time ON edits.edit_page_id = last_time.edit_page_id
AND edits.edit_time = last_time.edit_time
GROUP BY cat_id, stat
Output:
cat_id
stat
cnt
100
90
1
100
91
2
100
92
1
200
90
1
https://dbfiddle.uk/?rdbms=mysql_5.6&fiddle=7592c7853481f6b5a9626c8d111c1d3b (the query is applicable to MariaDB 10.1).
Is it possible to join on the edit_id (which is unique key for each edit)? – Inductiveload
No, this is impossible. cnt=2 counts two different edit_id values - what value must be used?
But you may obtain concatenated values list - simply add GROUP_CONCAT(edit_id) into the output list.
https://dbfiddle.uk/?rdbms=mysql_5.6&fiddle=b2391972c3f7c4be4254e47514d0f1da
think you dont need the second join - see if the query helps.
select
t1.stat, count(*) count_
from
(
SELECT
e.edit_id, p.page_id, e.stat,
rank() over(partition by e.edit_page_id order by e.edit_time desc) edit_rank
FROM
edits e
INNER JOIN pages p on e.edit_page_id = p.page_id
WHERE
p.cat_id = 100
) t1
where
t1.edit_rank = 1
group by
t1.stat
fiddle url : (https://dbfiddle.uk/?rdbms=mariadb_10.3&fiddle=0f681dc8d93cc3eebf9a03e0c8d84850)
select e1.stat, count(e1.stat) as count
from edits e1
join (
select edit_page_id, max(edit_time) as edit_time
from edits
where edit_page_id in (
select page_id
from pages
where cat_id = 100
)
group by edit_page_id
) as e2
on e1.edit_page_id = e2.edit_page_id and e1.edit_time = e2.edit_time
group by e1.stat;
Here's the link to fiddle - http://sqlfiddle.com/#!9/42f2ed/40/0
Edit: updated to consider edit_time instead of stat to find latest record
could help me solve this duplication problem where it returns more than 1 result for the same record I want to bring only 1 result for each id, and only the last history of each record.
My Query:
SELECT DISTINCT ON(tickets.ticket_id,ticket_histories.created_at)
ticket.id AS ticket_id,
tickets.priority,
tickets.title,
tickets.company,
tickets.ticket_statuse,
tickets.created_at AS created_ticket,
group_user.id AS group_id,
group_user.name AS user_group,
ch_history.description AS ch_description,
ch_history.created_at AS ch_history
FROM
tickets
INNER JOIN company ON (company.id = tickets.company_id)
INNER JOIN (SELECT id,
tickets_id,
description,
user_id,
MAX(tickets.created_at) AS created_ticket
FROM
ch_history
GROUP BY id,
created_at,
ticket_id,
user_id,
description
ORDER BY created_at DESC LIMIT 1) AS ch_history ON (ch_history.ticket_id = ticket.id)
INNER JOIN users ON (users.id = ch_history.user_id)
INNER JOIN group_users ON (group_users.id = users.group_user_id)
WHERE company = 15
GROUP BY
tickets.id,
ch_history.created_at DESC;
Result of my query, but returns 3 or 5 identical ids with different histories
I want to return only 1 id of each ticket, and only the last recorded history of each tick
ticket_id | priority | title | company_id | ticket_statuse | created_ticket | company | user_group | group_id | ch_description | ch_history
-----------+------------+--------------------------------------+------------+-----------------+----------------------------+------------------------------------------------------+-----------------+----------+------------------------+----------------------------
49713 | 2 | REMOVE DATA | 1 | t | 2019-12-09 17:50:35.724485 | SAME COMPANY | people | 5 | TEST 1 | 2019-12-10 09:31:45.780667
49706 | 2 | INCLUDE DATA | 1 | f | 2019-12-09 09:16:35.320708 | SAME COMPANY | people | 5 | TEST 2 | 2019-12-10 09:38:52.769515
49706 | 2 | ANY TITLE | 1 | f | 2019-12-09 09:16:35.320708 | SAME COMPANY | people | 5 | TEST 3 | 2019-12-10 09:39:22.779473
49706 | 2 | NOTING ELSE MAT | 1 | f | 2019-12-09 09:16:35.320708 | SAME COMPANY | people | 5 | TESTE 4 | 2019-12-10 09:42:59.50332
49706 | 2 | WHITESTRIPES | 1 | f | 2019-12-09 09:16:35.320708 | SAME COMPANY | people | 5 | TEST 5 | 2019-12-10 09:44:30.675434
wanted to return as below
ticket_id | priority | title | company_id | ticket_statuse | created_ticket | company | user_group | group_id | ch_description | ch_history
-----------+------------+--------------------------------------+------------+-----------------+----------------------------+------------------------------------------------------+-----------------+----------+------------------------+----------------------------
49713 | 2 | REMOVE DATA | 1 | t | 2019-12-09 17:50:10.724485 | SAME COMPANY | people | 5 | TEST 1 | 2020-01-01 18:31:45.780667
49707 | 2 | INCLUDE DATA | 1 | f | 2019-12-11 19:22:21.320701 | SAME COMPANY | people | 5 | TEST 2 | 2020-02-05 16:38:52.769515
49708 | 2 | ANY TITLE | 1 | f | 2019-12-15 07:15:57.320950 | SAME COMPANY | people | 5 | TEST 3 | 2020-02-06 07:39:22.779473
49709 | 2 | NOTING ELSE MAT | 1 | f | 2019-12-16 08:30:28.320881 | SAME COMPANY | people | 5 | TESTE 4 | 2020-01-07 11:42:59.50332
49701 | 2 | WHITESTRIPES | 1 | f | 2019-12-21 11:04:00.320450 | SAME COMPANY | people | 5 | TEST 5 | 2020-01-04 10:44:30.675434
I wanted to return as shown below, see that the field ch_description, and ch_history bring only the most recent records and only the last of each ticket listed, without duplication I wanted to bring this way could help me.
Two things jump out at me:
You have listed "created at" as part of your "distinct on," which is going to inherently give you multiple rows per ticket id (unless there happens to be only one)
The distinct on should make the subquery on the ticket history unnecessary... and even if you chose to do it this way, you again are going on the "created at" column, which will give you multiple results. The ideal subquery, should you choose this approach, would have been to group by ticket_id and only ticket_id.
Slightly related:
An alternative approach to the subquery would be an analytic function (windowing function), but I'll save that for another day.
I think the query you want, which will give you one row per ticket_id, based on the history table's created_at field would be something like this:
select distinct on (t.id)
<your fields here>
from
tickets t
join company c on t.company_id = c.id
join ch_history ch on ch.ticket_id = t.id
join users u on ch.user_id = u.ud
join group_users g on u.group_user_id = g.id
where
company = 15
order by
t.id, ch.created_at -- this is what tells distinct on which record to choose
I have a team of people who are scored on up to three metrics; sales, leads and Hours.
I have a table (tblScores) in MS Access which holds these scores but only if there is any. (e.g if someone had no sales there would be no entry for them for sales)
| USERID | Metric | Score |
----------------------------------
| 20511 | Sales | 12 |
| 20511 | Leads | 9 |
| 20511 | Hours | 8 |
| 20694 | Sales | 10 |
| 20694 | Hours | 7.5 |
I am trying to create an SQL query that will output three records (each possible metric) for each User in the above table including null values where they don't have an entry for that metric. e.g
| USERID | Metric | Score |
----------------------------------
| 20511 | Sales | 12 |
| 20511 | Leads | 9 |
| 20511 | Hours | 8 |
| 20694 | Sales | 10 |
| 20694 | Leads | Null |
| 20694 | Hours | 7.5 |
I have set up another table (tblMetrics) with just these 3 metrics
| Metric |
---------------
| Sales |
| Leads |
| Hours |
and tried to do a left join on the metric table against the score table
SELECT tblMetrics.*, TblScores.UserID, TblScores.Score
FROM tblMetrics LEFT JOIN TblScores ON tblMetrics.Metric = TblScores.Metric;
but it is still not giving the desired output. Does anyone know if this possible?
You need to do a CROSS JOIN first to generate all combinations, then do the LEFT JOIN to find which one are missing and assign NULL
I check access syntaxis and the CROSS JOIN should be write like this
SELECT DISTINCT M.Metric, S.USERID
FROM tblMetric M, tblScore S
And the Left Join should be
SELECT userMetrc.*, S.Score
FROM ( SELECT DISTINCT M.Metric, S.USERID
FROM tblMetric M, tblScore S
) userMetric
LEFT JOIN tblScore S
ON ( userMetric.USERID = S.USERID
AND userMetric.Metric = S.Metric )
I have a table supplier_account which has five coloumns supplier_account_id(pk),supplier_id(fk),voucher_no,debit and credit. I want to get the sum of debit grouped by supplier_id and then subtract the value of credit of the rows in which voucher_no is not null. So for each subsequent rows the value of sum of debit gets reduced. I have tried using 'with' clause.
with debitdetails as(
select supplier_id,sum(debit) as amt
from supplier_account group by supplier_id
)
select acs.supplier_id,s.supplier_name,acs.purchase_voucher_no,acs.purchase_voucher_date,dd.amt-acs.credit as amount
from supplier_account acs
left join supplier s on acs.supplier_id=s.supplier_id
left join debitdetails dd on acs.supplier_id=dd.supplier_id
where voucher_no is not null
But here the debit value will be same for all rows. After subtraction in the first row I want to get the result in second row and subtract the next credit value from that.
I know it is possible by using temporary tables. The problem is I cannot use temporary tables because the procedure is used to generate reports using Jasper Reports.
What you need is an implementation of the running total. The easiest way to do it with a help of a window function:
with debitdetails as(
select id,sum(debit) as amt
from suppliers group by id
)
select s.id, purchase_voucher_no, dd.amt, s.credit,
dd.amt - sum(s.credit) over (partition by s.id order by purchase_voucher_no asc)
from suppliers s
left join debitdetails dd on s.id=dd.id
order by s.id, purchase_voucher_no
SQL Fiddle
Results:
| id | purchase_voucher_no | amt | credit | ?column? |
|----|---------------------|-----|--------|----------|
| 1 | 1 | 43 | 5 | 38 |
| 1 | 2 | 43 | 18 | 20 |
| 1 | 3 | 43 | 8 | 12 |
| 2 | 4 | 60 | 5 | 55 |
| 2 | 5 | 60 | 15 | 40 |
| 2 | 6 | 60 | 30 | 10 |
I have two tables from which I'm trying to run a query to return the maximum (or top) transaction for each person. I should note that I cannot change the table structure. Rather, I can only pull data.
People
+-----------+
| id | name |
+-----------+
| 42 | Bob |
| 65 | Ted |
| 99 | Stu |
+-----------+
Transactions (there is no primary key)
+---------------------------------+
| person | amount | date |
+---------------------------------+
| 42 | 3 | 9/14/2030 |
| 42 | 4 | 7/02/2015 |
| 42 | *NULL* | 2/04/2020 |
| 65 | 7 | 1/03/2010 |
| 65 | 7 | 5/20/2020 |
+---------------------------------+
Ultimately, for each person I want to return the highest amount. If that doesn't work then I'd like to look at the date and return the most recent date.
So, I'd like my query to return:
+----------------------------------------+
| person_id | name | amount | date |
+----------------------------------------+
| 42 | Bob | 4 | 7/02/2015 | (<- highest amount)
| 65 | Ted | 7 | 5/20/2020 | (<- most recent date)
| 99 | Stu | *NULL* | *NULL* | (<- no records in Transactions table)
+----------------------------------------+
SELECT People.id, name, amount, date
FROM People
LEFT JOIN (
SELECT TOP 1 person_id
FROM Transactions
WHERE person_id = People.id
ORDER BY amount DESC, date ASC
)
ON People.id = person_id
I can't figure out what I am doing wrong, but I know it's wrong. Any help would be much appreciated.
You are almost there but since there are duplicate Id in the Transaction table ,so you need to remove those by using Row_number() function
Try this :
With cte as
(Select People,amount,date ,row_number() over (partition by People
order by amount desc, date desc) as row_num
from Transac )
Select * from People as a
left join cte as b
on a.ID=b.People
and b.row_num=1
The result is in Sql Fiddle
Edit: Row_number() from MSDN
Returns the sequential number of a row within a partition of a result set,
starting at 1 for the first row in each partition.
Partition is used to group the result set and Over by clause is used
Determine the partitioning and ordering of the rowset before the
associated window function is applied.