tbl_totalMonth has id,time, date and kwh column.
I want to get the last recorded data of the months and group it per month so the result would be the name of the month and kwh.
the result should be something like this:
month | kwh
------------
January | 150
February | 400
the query I tried: (but it returns the max kwh not the last kwh recorded)
SELECT DATENAME(MONTH, a.date) as monthly, max(a.kwh) as kwh
from tbl_totalMonth a
WHERE date > = DATEADD(yy,DATEDIFF(yy,0, GETDATE() -1 ),0)
group by DATENAME(MONTH, a.date)
I suspect you need something quite different:
select *
from (
select *
, row_number() over(partition by month(a.date), year(a.date) order by a.date DESC) as rn
from tbl_totalMonth a
WHERE date > = DATEADD(yy,DATEDIFF(yy,0, GETDATE() -1 ),0)
) d
where rn = 1
To get "the last kwh recorded (per month)" you need to use row_number() which - per month - will order the rows (descending) and give each one a row number. When that number is 1 you have "the most recent" row for that month, and you won't need group by at all.
You could use group by and month
select datename(month, date), sum(kwh)
from tbl_totalMonth
where date = (select max(date) from tbl_totalMonth )
group by datename(month, date)
if you need only the last row for each month then youn should use
select datename(month, date), khw
from tbl_totalMonth a
inner join (
select max(date) as max_date
from tbl_totalMonth
group by month(date)) t on t.max_date = a.date
Related
I have a table records like this in Athena, one user one row in a month:
month, id
2020-05 1
2020-05 2
2020-05 5
2020-06 1
2020-06 5
2020-06 6
Need to calculate the percentage=( users come both prior month and current month )/(prior month total users).
Like in the above example, users come both in May and June 1,5 , May total user 3, this should calculate a percentage of 2/3*100
with monthly_mau AS
(SELECT month as mauMonth,
date_format(date_add('month',1,cast(concat(month,'-01') AS date)), '%Y-%m') AS nextMonth,
count(distinct userid) AS monthly_mau
FROM records
GROUP BY month
ORDER BY month),
retention_mau AS
(SELECT
month,
count(distinct useridLeft) AS retention_mau
FROM (
(SELECT
userid as useridLeft,month as monthLeft,
date_format(date_add('month',1,cast(concat(month,'-01') AS date)), '%Y-%m') AS nextMonth
FROM records ) AS prior
INNER JOIN
(SELECT
month ,
userid
FROM records ) AS current
ON
prior.useridLeft = current.userid
AND prior.nextMonth = current.month )
WHERE userid is not null
GROUP BY month
ORDER BY month )
SELECT *, cast(retention_mau AS double)/cast(monthly_mau AS double)*100 AS retention_mau_percentage
FROM monthly_mau as m
INNER JOIN monthly_retention_mau AS r
ON m.nextMonth = r.month
order by r.month
This gives me percentage as 100 which is not right. Any idea?
Hmmm . . . assuming you have one row per user per month, you can use window functions and conditional aggregation:
select month, count(*) as num_users,
sum(case when prev_month = dateadd('month', -1, month) then 1 else 0 end) as both_months
from (select r.*,
cast(concat(month, '-01') AS date) as month_date,
lag(cast(concat(month, '-01') AS date)) over (partition by id order by month) as prev_month_date
from records r
) r
group by month;
I am trying to find the total contracts by month. Data is stored in columns (Start Date) and (End Date) multiple lines of data for each month.
SELECT e.CustomerID, e.AgentID,
COUNT(*) engagementnumber
FROM Engagements e
GROUP BY EndDate
The first time I ran the code with
SELECT COUNT(*) engagementnumber,
FROM Engagements,
GROUP BY EndDate
I got a count but it wasn't grouped by month.
You can unpivot the dates and use aggregation:
select year(dte), month(dte),
sum(inc) as change_in_month,
sum(sum(inc)) over (order by min(dte) as active_in_month
from ((select startdate as dte, 1 as inc from Engagements) union all
(select enddate, -1 as int from Engagements)
) t
group by year(dte), month(dte)
order by year(dte), month(dte);
You can try something like
SELECT MONTH(enddate), COUNT(*) OVER (PARTITION BY MONTH(enddate)) engagementnumber FROM engagements
I have a table with 4 columns huge number of records. It has the following structure:
DATE_ENTERED EMP_NAME DATA ORIGINATED
01-JAN-20 A 545454 APPLE
I want to calculate no of records for every first day of every month in a year
is there any way can we fetch the data for every first day of month.
In oracle you can use TRUNC function on the date as follows:
SELECT TRUNC(DATE_ENTERED), COUNT(1) AS CNT
FROM YOUR_TABLE
WHERE TRUNC(DATE_ENTERED) = TRUNC(DATE_ENTERED, 'MON')
GROUP BY TRUNC(DATE_ENTERED, 'MON')
Please note that the TRUNC(DATE_ENTERED, 'MON') returns the first day of the month for DATE_ENTERED.
Cheers!!
SELECT Year, Month, COUNT(*)
FROM
(
SELECT
YEAR(DATE_ENTERED) Year
MONTH(DATE_ENTERED) Month
DAY(DATE_ENTERED) Day
FROM your_table
WHERE DAY(DATE_ENTERED) = 1
) A
GROUP BY Year, Month
Generally WHERE DAY(DATE_ENTERED) = 1 will get you the records only for dates at the start of each month. Thus using Year and Month function you can group them by in order to get a count for each year and each month
You mean something like
SELECT COUNT(*)
FROM Table
WHERE DAY(DATE_ENTERED) = 1 AND
YEAR(DATE_ENTERED) = Some_Year
GROUP BY DATE_ENTERED
You can also use DATE_ENTERED BETWEEN 'YYYY0101' and 'YYYY1231' (replace the YYYY with the year you want to retrieve data for) instead of YEAR(DATE_ENTERED) = Some_Year, if performance is an issue.
You can use something like this:
select * from your_table
where DAY(DATE_ENTERED) = 1
and DATE_ENTERED between '2020-01-01' and '2020-12-31'
for number of count use this:
select count(*) from your_table
where DAY(DATE_ENTERED)= 1
and DATE_ENTERED between '2020-01-01' and '2020-12-31'
UPDATE
select * from your_table where Extract(day FROM DATE_ENTERED) = 1 and DATE_ENTERED between '01-JAN-20 ' and '01-DEC-20 ';
this is how the data looks like:
For the list of records
select count(*) from your_table where Extract(day FROM DATE_ENTERED) = 1 and DATE_ENTERED between '01-JAN-20 ' and '01-DEC-20 ';
UPDATE-2
select EXTRACT(month from DATE_ENTERED) as Count,
to_char(to_date(DATE_ENTERED, 'DD-MM-YYYY'), 'Month') from your_table
where Extract(day FROM DATE_ENTERED) = 1 and DATE_ENTERED between '01-JAN-20
'and '01-DEC-20 ' group by EXTRACT(month from DATE_ENTERED),
to_char(to_date(DATE_ENTERED, 'DD-MM-YYYY'), 'Month');
Here is the output:
I am trying to count unique users on a monthly basis that were not present in the previous month. So if a user has a record for January and then another one for February, then I would only count January for that user.
user_id time
a1 1/2/17
a1 2/10/17
a2 2/18/17
a4 2/5/17
a5 3/25/17
My results should look like this
Month User Count
January 1
February 2
March 1
I'm not really familiar with BigQuery, but here's how I would solve the problem using TSQL. I imagine that you'd be able to use similar logic in BigQuery.
1). Order the data by user_id first, and then time. In TSQL, you can accomplish this with the following and store it in a common table expression, which you will query in the step after this.
;WITH cte AS
(
select ROW_NUMBER() OVER (PARTITION BY [user_id] ORDER BY [time]) AS rn,*
from dbo.employees
)
2). Next query for only the rows with rn = 1 (the first occurrence for a particular user) and group by the month.
select DATENAME(month, [time]) AS [Month], count(*) AS user_count
from cte
where rn = 1
group by DATENAME(month, [time])
This is assuming that 2017 is the only year you're dealing with. If you're dealing with more than one year, you probably want step #2 to look something like this:
select year([time]) as [year], DATENAME(month, [time]) AS [month],
count(*) AS user_count
from cte
where rn = 1
group by year([time]), DATENAME(month, [time])
First aggregate by the user id and the month. Then use lag() to see if the user was present in the previous month:
with du as (
select date_trunc(time, month) as yyyymm, user_id
from t
group by date_trunc(time, month)
)
select yyyymm, count(*)
from (select du.*,
lag(yyyymm) over (partition by user_id order by yyyymm) as prev_yyyymm
from du
) du
where prev_yyyymm is not null or
prev_yyyymm < date_add(yyyymm, interval 1 month)
group by yyyymm;
Note: This uses the date functions, but similar functions exist for timestamp.
The way I understood question is - to exclude user to be counted in given month only if same user presented in previous month. But if same user present in few months before given, but not in previous - user should be counted.
If this is correct - Try below for BigQuery Standard SQL
#standardSQL
SELECT Year, Month, COUNT(DISTINCT user_id) AS User_Count
FROM (
SELECT *,
DATE_DIFF(time, LAG(time) OVER(PARTITION BY user_id ORDER BY time), MONTH) AS flag
FROM (
SELECT
user_id,
DATE_TRUNC(PARSE_DATE('%x', time), MONTH) AS time,
EXTRACT(YEAR FROM PARSE_DATE('%x', time)) AS Year,
FORMAT_DATE('%B', PARSE_DATE('%x', time)) AS Month
FROM yourTable
GROUP BY 1, 2, 3, 4
)
)
WHERE IFNULL(flag, 0) <> 1
GROUP BY Year, Month, time
ORDER BY time
you can test / play with above using below example with dummy data from your question
#standardSQL
WITH yourTable AS (
SELECT 'a1' AS user_id, '1/2/17' AS time UNION ALL
SELECT 'a1', '2/10/17' UNION ALL
SELECT 'a2', '2/18/17' UNION ALL
SELECT 'a4', '2/5/17' UNION ALL
SELECT 'a5', '3/25/17'
)
SELECT Year, Month, COUNT(DISTINCT user_id) AS User_Count
FROM (
SELECT *,
DATE_DIFF(time, LAG(time) OVER(PARTITION BY user_id ORDER BY time), MONTH) AS flag
FROM (
SELECT
user_id,
DATE_TRUNC(PARSE_DATE('%x', time), MONTH) AS time,
EXTRACT(YEAR FROM PARSE_DATE('%x', time)) AS Year,
FORMAT_DATE('%B', PARSE_DATE('%x', time)) AS Month
FROM yourTable
GROUP BY 1, 2, 3, 4
)
)
WHERE IFNULL(flag, 0) <> 1
GROUP BY Year, Month, time
ORDER BY time
The output is
Year Month User_Count
2017 January 1
2017 February 2
2017 March 1
Try this query:
SELECT
t1.d,
count(DISTINCT t1.user_id)
FROM
(
SELECT
EXTRACT(MONTH FROM time) AS d,
--EXTRACT(MONTH FROM time)-1 AS d2,
user_id
FROM nbitra.tmp
) t1
LEFT JOIN
(
SELECT
EXTRACT(MONTH FROM time) AS d,
user_id
FROM nbitra.tmp
) t2
ON t1.d = t2.d+1
WHERE
(
t1.user_id <> t2.user_id --User is in previous month
OR t2.user_id IS NULL --To handle january, since there is no previous month to compare to
)
GROUP BY t1.d;
I have a table, lets say "Records" with structure:
id date
-- ----
1 2012-08-30
2 2012-08-29
3 2012-07-25
I need to write an SQL query in PostgreSQL to get record_id for MIN date in each month.
month record_id
----- ---------
8 2
7 3
as we see 2012-08-29 < 2012-08-30 and it is 8 month, so we should show record_id = 2
I tried something like this,
SELECT
EXTRACT(MONTH FROM date) as month,
record_id,
MIN(date)
FROM Records
GROUP BY 1,2
but it shows 3 records.
Can anybody help?
SELECT DISTINCT ON (EXTRACT(MONTH FROM date))
id,
date
FROM Records1
ORDER BY EXTRACT(MONTH FROM date),date
SQLFiddle http://sqlfiddle.com/#!12/76ca2/3
UPD: This query:
1) Orders the records by month and date
2) For every month picks the first record (the first record has MIN(date) because of ordering)
Details here http://www.postgresql.org/docs/current/static/sql-select.html#SQL-DISTINCT
This will return multiples if you have duplicate minimum dates:
Select
minbymonth.Month,
r.record_id
From (
Select
Extract(Month From date) As Month,
Min(date) As Date
From
records
Group By
Extract(Month From date)
) minbymonth
Inner Join
records r
On minbymonth.date = r.date
Order By
1;
Or if you have CTEs
With MinByMonth As (
Select
Extract(Month From date) As Month,
Min(date) As Date
From
records
Group By
Extract(Month From date)
)
Select
m.Month,
r.record_id
From
MinByMonth m
Inner Join
Records r
On m.date = r.date
Order By
1;
http://sqlfiddle.com/#!1/2a054/3
select extract(month from date)
, record_id
, date
from
(
select
record_id
, date
, rank() over (partition by extract(month from date) order by date asc) r
from records
) x
where r=1
order by date
SQL Fiddle
select distinct on (date_trunc('month', date))
date_trunc('month', date) as month,
id,
date
from records
order by 1, 3 desc
I think you need use sub-query, something like this:
SELECT
EXTRACT(MONTH FROM r.date) as month,
r.record_id
FROM Records as r
INNER JOIN (
SELECT
EXTRACT(MONTH FROM date) as month,
MIN(date) as mindate
FROM Records
GROUP BY EXTRACT(MONTH FROM date)
) as sub on EXTRACT(MONTH FROM r.date) = sub.month and r.date = sub.mindate