I have the following query from which I need to extract the median value of total_views.
SELECT
#rownum:=#rownum + 1 AS row_num, total_views, projectId
FROM
(SELECT
a.creation,
a.projectId,
devices,
browserIds,
devices + browserIds AS total_views
FROM
((SELECT
projectId, creation
FROM
event
WHERE
kind = 'project_creation'
AND creation > '2017-04-28') a
INNER JOIN ((SELECT
COUNT(DISTINCT deviceId) AS devices, projectId, creation
FROM
event
WHERE
kind = 'open' AND component = 'mobile'
GROUP BY projectId) b
JOIN (SELECT
COUNT(DISTINCT browserId) AS browserIds, projectId, creation
FROM
event
WHERE
kind = 'open' AND component = 'web'
GROUP BY projectId) c ON b.projectId = c.projectId) ON a.projectId = b.projectId
OR a.projectId = c.projectId)
ORDER BY total_views ASC) d,
(SELECT #rownum:=0) e
;
This a part of the result :
1 1 151
2 1 256
3 1 301
4 2 404
5 2 305
6 3 895
7 4 654
8 4 369
9 9 874
10 10 123
I need to extend the query to extract the median value of total_views.
Any ideas?
Found the solution, needed to use the value of the #rownum variable instead of using the value of the field row_num to determine the position of the middle value.
I then calculate the average value of the total_views in the middle of the result set.
(Average of two middle values if the result has an even number of lines. average of the middle value if the resultset has an odd number of lines, which is the same as the middle value).
thus using the condition :
WHERE row_num in (CEIL(#rownum/2), FLOOR(#rownum/2))
full query:
SELECT avg(total_views) from
(SELECT
#rownum:=#rownum + 1 AS row_num, total_views, projectId
FROM
(SELECT
a.creation,
a.projectId,
devices,
browserIds,
devices + browserIds AS total_views
FROM
((SELECT
projectId, creation
FROM
event
WHERE
kind = 'project_creation'
AND creation > '2017-04-28') a
INNER JOIN ((SELECT
COUNT(DISTINCT deviceId) AS devices, projectId, creation
FROM
event
WHERE
kind = 'open' AND component = 'mobile'
GROUP BY projectId) b
JOIN (SELECT
COUNT(DISTINCT browserId) AS browserIds, projectId, creation
FROM
event
WHERE
kind = 'open' AND component = 'web'
GROUP BY projectId) c ON b.projectId = c.projectId) ON a.projectId = b.projectId
OR a.projectId = c.projectId)
ORDER BY total_views ASC) d,
(SELECT #rownum:=0) e) f WHERE row_num in (CEIL(#rownum/2), FLOOR(#rownum/2))
;
Related
I have a question in Sql.
I have a table which I am recording running status changes. This is like in belows.
Equip
TS
Stat
A
12/31/2020 19:55:10
0
A
01/06/2020 16:47:59
1
B
12/27/2020 21:39:20
1
B
12/29/2020 01:01:32
0
C
12/29/2020 01:00:54
1
C
12/29/2020 01:01:32
0
On the table there is one currently running equipment.I want to get number of currently running equipments. How can I make this on query? Could you help me about this?
You can use ROW_NUMBER analytical function as follows:
select count(*) from
(select t.*,
row_number() over (partition by equip order by ts desc) as rn
from t) t
where rn = 1 and stat = 1
You can also use NOT EXISTS as follows:
select count(*) from t
where t.stat = 1
and not exists
(select 1 from t tt
where tt.equip = t.equip and tt.ts > t.ts)
You can do this with two levels of aggregation. This query gets currently running equipment:
select equip
from t
group by equip
having max(ts) = max(case when stat = 1 then ts end);
It checks that the maximum ts is the same as the maximum with a status value of 1.
If you want to count the values rather than return them, then you can use a subquery:
select count(*)
from (select equip
from t
group by equip
having max(ts) = max(case when stat = 1 then ts end)
) e;
I have a table with 3 columns id, type, value like in image below.
What I'm trying to do is to make a query to get the data in this format:
type previous current
month-1 666 999
month-2 200 15
month-3 0 12
I made this query but it gets just the last value
select *
from statistics
where id in (select max(id) from statistics group by type)
order
by type
EDIT: Live example http://sqlfiddle.com/#!9/af81da/1
Thanks!
I would write this as:
select s.*,
(select s2.value
from statistics s2
where s2.type = s.type
order by id desc
limit 1, 1
) value_prev
from statistics s
where id in (select max(id) from statistics s group by type) order by type;
This should be relatively efficient with an index on statistics(type, id).
select
type,
ifnull(max(case when seq = 2 then value end),0 ) previous,
max( case when seq = 1 then value end ) current
from
(
select *, (select count(*)
from statistics s
where s.type = statistics.type
and s.id >= statistics.id) seq
from statistics ) t
where seq <= 2
group by type
I'm trying t create a compare, now i'm only able to make it as multiple result (two different result).
both of the result above is from two queries.
My first result query
SELECT
customercode,
CONVERT(DATE, TransDate) transdate,
SUM(TotalReceivable) AS total
FROM
SalesOrderHeader
WHERE
CustomerCode = 'K-MDMM4'
AND TransDate BETWEEN '2016-07-25' AND '2016-07-30'
GROUP BY
CONVERT(DATE, TransDate), customercode
and my second query
SELECT
b.OutletCode AS outlet,
tanggal,
(cash + cc + dc + flash + piutang + reject + disc50 +
isnull(spesial_item,0)) total
FROM
transaksi a
LEFT JOIN
Outlet b ON a.Outlet = b.OutletCode
LEFT JOIN
area c ON b.areacode = c.areacode
WHERE
b.active = 1
AND b.OutletCode LIKE 'K-MDMM4'
AND flag = 1
AND tanggal BETWEEN '2016-07-25' AND '2016-07-30'
GROUP BY
b.OutletCode, tanggal, cash, cc, dc, flash,
piutang, reject, disc50, spesial_item, ba, mpm, tf,
ul,remarks
ORDER BY
tanggal DESC
I want this result.
customercode | transdate | total_tbl1 | total_tbl2
K-MDMM4 2016-07-25 6004050 6004050
K-MDMM4 2016-07-26 6880340 6880340
K-MDMM4 2016-07-27 5745040 5745040
K-MDMM4 2016-07-28 7424820 7424820
I can't use jsfiddle :(. I don't know why. I can't create table via queries.
From now, I have this query
SELECT
b.OutletCode AS outlet,
tanggal,
(cash + cc + dc + flash + piutang + reject + disc50 +
isnull(spesial_item, 0)) total,
SUM(d.TotalReceivable) AS total
FROM
transaksi a
LEFT JOIN
Outlet b ON a.Outlet = b.OutletCode
LEFT JOIN
area c ON b.areacode = c.areacode
LEFT JOIN
salesorderheader d ON CONVERT(DATE, a.tanggal) = CONVERT(DATE, d.transdate)
WHERE
b.active = 1
AND b.BrandCode LIKE '%%'
AND b.OutletCode LIKE '%%'
AND flag = 1
AND YEAR(tanggal) = '2016'
AND MONTH(tanggal) = '7'
AND outlet = 'K-MDMM4'
GROUP BY
OutletCode, tanggal, cash, cc, dc, flash,
piutang, reject, disc50, spesial_item, transdate, totalreceivable
ORDER BY
tanggal DESC
and the result so far from my desired result....
Combine both queries into a single join and select
SELECT tbl1.customercode,
CAST(tbl1.transdate AS DATE) AS transdate,
tbl1.total AS total_tbl1,
tbl2.total AS total_tbl2
FROM
(
-- Query 1
SELECT customercode,convert(date,TransDate) transdate,SUM(TotalReceivable) as total
FROM SalesOrderHeader
where CustomerCode = 'K-MDMM4'
and TransDate between '2016-07-25' and '2016-07-30'
group by convert(date,TransDate),customercode
) AS tbl1
INNER JOIN (
-- Query 2
select b.OutletCode as outlet,tanggal, (cash + cc + dc + flash + piutang + reject + disc50 +
isnull(spesial_item,0)) total From transaksi a
left join Outlet b on a.Outlet = b.OutletCode
left join area c on b.areacode = c.areacode
where b.active = 1 and b.OutletCode like 'K-MDMM4' and flag = 1 and tanggal
between '2016-07-25' and '2016-07-30'
group by b.OutletCode,tanggal,cash,cc,dc,flash,piutang,reject,disc50,spesial_item,ba,mpm,tf,ul,remarks
) AS tbl2 ON tbl2.outlet = tbl1.customercode AND CAST(tbl2.trnggal AS DATE) = CAST(tbl1.transdate AS DATE)
order by CAST(tbl1.transdate AS DATE) DESC;
I don't have a database installed on this PC but what you're looking for is:
SELECT val1, val2 FROM
(SELECT1_of_your_code AS table1) INNER JOIN
(SELECT2_of_your_code AS table2) ON
table1.x == table2.y
So I'll show you what I'm trying to do and explain my problem, there may be an answer different to the approach I'm trying to take.
The query I'm trying to perform is as follows:
SELECT *
FROM report_keywords rk
WHERE rk.report_id = 231
AND (
SELECT SUM(t.conv) FROM (
SELECT conv FROM report_keywords t2 WHERE t2.campaign_id = rk.campaign_id ORDER BY conv DESC LIMIT 10
) t
) >= 30
GROUP BY rk.campaign_id
The error I get is
Unknown column 'rk.campaign_id' in 'where clause'
Obviously this is saying that the table alias rk is not making it to the subsubquery. What I'm trying to do is get all of the campaigns where the sum of the top 10 conversions is greater than or equal to 30.
The relevant table structure is:
id INT,
report_id INT,
campaign_id INT,
conv INT
Any help would be greatly appreciated.
Update
Thanks to Kickstart I was able to do what I wanted. Here's my final query:
SELECT campaign_id, SUM(conv) as sum_conv
FROM (
SELECT campaign_id, conv, #Sequence := if(campaign_id = #campaign_id, #Sequence + 1, 1) AS aSequence, #campaign_id := campaign_id
FROM report_keywords
CROSS JOIN (SELECT #Sequence := 0, #campaign_id := 0) Sub1
WHERE report_id = 231
ORDER BY campaign_id, conv DESC
) t
WHERE aSequence <= 10
GROUP BY campaign_id
HAVING sum_conv >= 30
Possibly use a user variable to add a sequence number to get the latest 10 records for each one, then use SUM to get the count of those.
Something like this:-
SELECT rk.*
FROM report_keywords rk
INNER JOIN
(
SELECT campaign_id, SUM(conv) AS SumConv
FROM
(
SELECT campaign_id, conv, #Sequence := if(campaign_id = #campaign_id, #Sequence + 1, 1) AS aSequence, #campaign_id := campaign_id
FROM report_keywords
CROSS JOIN (SELECT #Sequence := 0, #campaign_id := "") Sub1
ORDER BY campaign_id, conv
) Sub2
WHERE aSequence <= 10
GROUP BY campaign_id
) Sub3
ON rk.campaign_id = Sub3.campaign_id AND Sub3.SumConv >= 30
WHERE rk.report_id = 231
Evening,
I am trying to get an output of rows that are limited to n per group in MySQL. I can get it to work without joins, but with it I am just shy. I've pasted a dump of the relevant tables here:
http://pastebin.com/6F0v1jhZ
The query I am using is:
SELECT
title, catRef, RowNum, pCat, tog
FROM
(
SELECT
title, catRef,
#num := IF(#prevCat=catRef,#num+1,1) AS RowNum,
#prevCat AS tog,
#prevCat := catRef AS pCat
FROM (select #prevCat:=null) AS initvars
CROSS JOIN
(
SELECT p.title, oi.catRef
FROM resources p
INNER JOIN placesRel v ON (p.resId = v.refId)
INNER JOIN catRel oi ON (p.resId = oi.refId)
WHERE p.status = 'live' AND v.type = 'res' AND oi.type = 'res'
) AS T
) AS U
WHERE RowNum <= 5
ORDER BY catRef
I just can't get the row count to go up. Or any other solution would be greatly appreciated.
I'm looking for a result like this:
title catRef RowNum
Title1 1 1
Title2 1 2
Title3 1 3
Title4 2 1
Title5 2 2
Title6 3 1
At the moment, the RowNum column is always 1.
This works:
SET #num := 1, #prevCat := 0;
SELECT title, start, end, type, description, linkOut, outType, catRef, row_number
FROM (
SELECT title, start, end, type, description, linkOut, outType, catRef,
#num := if(#prevCat = catRef, #num + 1, 1) as row_number,
#prevCat AS tog,
#prevCat := catRef AS dummy
FROM (
SELECT title, start, end, resources.type, description, linkOut, outType, catRef
FROM resources LEFT JOIN placesRel ON placesRel.refId = resId LEFT JOIN catRel ON catRel.refId = resId
WHERE status = 'live' AND placesRel.type = 'res' AND catRel.type = 'res'
ORDER BY catRef
) AS w
) AS x WHERE x.row_number <= 4;
You need to put your joined query in a sub-query and order it by the column you want to group by. Use it's parent query to add row numbers. Then, the top-level query glues it all together.
If you don't put your joined query in it's own sub-query, the results won't be ordered as you wish, but instead will come out in the order they are in the database. This means the data is not grouped, so row numbers will no be applied to ordered rows.