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Select distinct rows by count in descending order


Select distinct rows by count in descending order

By : MrO
Date : November 19 2020, 01:01 AM
around this issue I have a table hastags , I chose 2014-12-29 as an example of a specific time
code :
select tag, 
       sum(`time` > '2014-12-29') as sum_greater,
       sum(`time` < '2014-12-29') as sum_smaller
from hashtags
group by tag
order by sum_greater desc, sum_smaller desc
limit 3


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SQL Server: select distinct mon-yyyy format output sorty by descending order

SQL Server: select distinct mon-yyyy format output sorty by descending order


By : user3015928
Date : March 29 2020, 07:55 AM
I hope this helps you . I have datetime column in a table with following data:
code :
with testdata as
(
  select cast('2011-03-23' as datetime) as d
union all
  select cast('2011-04-19' as datetime)
union all
  select cast('2011-04-26' as datetime)
union all
  select cast('2011-05-26' as datetime)
)
SELECT DATENAME(month,d)+'-'+DATENAME(year,d)
FROM testdata
GROUP BY DATEPART(year,d), DATEPART(month,d), DATENAME(month,d),DATENAME(year,d)
ORDER BY DATEPART(year,d), DATEPART(month,d)
SELECT DATENAME(month,ReportDate)+'-'+DATENAME(year,ReportDate)
FROM [EnvelopsDB].[dbo].[Envelopes]
GROUP BY DATEPART(year,ReportDate), DATEPART(month,ReportDate), DATENAME(month,ReportDate),DATENAME(year,ReportDate)
ORDER BY DATEPART(year,ReportDate), DATEPART(month,ReportDate)
How to return rows listed in descending order of COUNT(*)?

How to return rows listed in descending order of COUNT(*)?


By : Manjusha G
Date : March 29 2020, 07:55 AM
help you fix your problem Simply by applying a GROUP BY clause, and assuming you have an index , FOREIGN KEY, or PRIMARY KEY on parentId, the performance should be quite good. (parentId looks like it is likely a FORIEGN KEY, so be sure to define the constraint to enforce indexing).
code :
SELECT `parentId`
FROM `foo`
GROUP BY `parentId`
ORDER BY COUNT(*) DESC
Why does SELECT DISTINCT return a different number of rows than COUNT(DISTINCT)?

Why does SELECT DISTINCT return a different number of rows than COUNT(DISTINCT)?


By : Mandrake
Date : March 29 2020, 07:55 AM
help you fix your problem According to the MSDN documentation on COUNT:
How to select rows with id just larger than x in descending order

How to select rows with id just larger than x in descending order


By : Gregory Miller
Date : March 29 2020, 07:55 AM
To fix this issue Most human beings would not consider this simpler. But, it doesn't use a subquery:
code :
select unnest( (array_agg(p.id order by p.id asc)::int[])[1:5]) as id
from posts p
where p.id >= 15
order by id desc;
Count rows in multiple csv's, write to csv's as new column in descending order

Count rows in multiple csv's, write to csv's as new column in descending order


By : user2682711
Date : March 29 2020, 07:55 AM
I wish this help you I need help editing multiple csv's within a folder. I need to count the number of rows in each file, and add a new column to the files. The new column should have the number of rows as the first row in the column, and then descend by 1 for each subsequent row. , We can do
code :
df1$newcol <- rev(seq_len(nrow(df1)))
df1$newcol <-  nrow(df1):1
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