How to merge two csv files in powershell with same headers and discard duplicate rows

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I am collecting performance counters from NetApp Performance Manager software (OPM). OPM saves 30 days worth of data in MySQL database. So i have to put two queries to retrieve the data:

  1. First Query on 30th of every month and save in csv file.
  2. Second Query on 1st of every month and save in csv file.

Then merge the two csv files to get data if there are 31 days in a month.

Both files look like below:

"Time","objid","cpuBusy","cifsOps","avgLatency"
"2016:06:04 00:04","72","50.6196","2069.11","7622.1"
"2016:06:04 00:09","72","30.2233","2075.94","7633.27"
"2016:06:04 00:14","72","35.2559","1980.64","8352.17"

When i merge the two csv files with below code. I get duplicate rows with data from same data/time.

@(Import-Csv au2004npsa003-mm-business.csv) + @(Import-Csv au2004npsa003-nn-business.csv) | export-csv joined.csv -NoTypeInformation

How can i merge the two csv files without getting duplicate data? I have tried select -unique however, it gives just one row.

How to merge and remove duplicates of CSV files using Powershell , Don't use Get-Content or Set-Content to import or export csv file replacing any records in the HandoverINC.csv with the same primary to the HandoverINC.csv (Basically what is called a Full Join in SQL). To simplify (merging and removing duplicates with the same header), as suggested by Vincent: I'm trying to merge 2 CSV Files that have the same header and then remove the duplicates of the resulting file based on the IDs listed in the first column and then put it to the same CSV file. The properties of the file are as follows: And when I try to use the sort and unique method, I get the following (not a table: Here is my code so far:

Select -Unique is actually the correct way, you just need a little bit more. Which is -Property * or simply *

As Select -Unique does not automatically compares all the properties, you need to specify * so that it compares the whole object.

$csv1 = Import-Csv -Path ".\csv1.csv"
$csv2 = Import-Csv -Path ".\csv2.csv"

$merged = $csv1 + $csv2

$merged | Select -Property * -Unique

Merge CSV files or PSObjects in PowerShell, For simple concatenation of two CSV files with shared headers, all you need is Just rename the module .psm1 to .ps1 and dot-source it to achieve the same thing. You can filter columns with Select-Object and filter out rows with empty values in To remove duplicate (between the files to merge) headers from a CSV file,  Import the input.csv file. Group the objects by planid and transaction. Select the properties you want in your output PlanId = whatever is left of the comma in the name field of the object returned by group-object. Transaction = whatever is right of the comma in the name field of the object returned by group-object.

made it complete script just run it

#** ### Merged CSV to Unique


#csv1
   # name,id, birth
  #John,007,1999
  #john,008,1999
  #john,709,1999


#csv2

  # name,id, birth
  #John,006,1999
  #john,005,1999
  #john,709,1999

#After Merged

  #John,007,1999
  #john,008,1999
  #**john,709,1999
  #John,006,1999
  #john,005,1999


  #  >>> Only one Unique Files exits john,709,1999


  ##### Just merge CSV example

#csv1
   # name,id, birth
  #John,007,1999
  #john,008,1999
  #john,709,1999

  #csv2
  # name,id, birth
   #John,006,1999
  #john,005,1999
  #john,709,1999


  ## after Merged

   #name,id, birth
  #John,007,1999
  #john,008,1999
  #john,709,1999
  #John,006,1999
  #john,005,1999
  #john,709,1999




 ## Usage

$csv1 = Import-Csv -Path "D:\CSV1.csv" #change the path to where csv one exists
$csv2 = Import-Csv -Path "D:\CSV2.csv" #change the path to where other exists
$UniQexpopath= 'D:\uniqueMerged.csv'  #change the path to where you want to export unique csv
$expopath= 'D:\merged.csv' #change the path to where you want to export Merged csv



  Write-Host "Would you like to Unique Merge the CSV?"        -ForegroundColor Green 
$Response = Read-Host "[Y] Yes, [N] No" 
    If($Response -eq "y") 
{write-host "Merging Csv please wait" -foregroundcolor Red

$merged | Select -Property * -Unique | Export-csv -path $UniQexpopath -NoTypeInformation 
write-host "Merging completed please check $UniQexpopath" -foregroundcolor Green}


  else{ write-host "Merging Csv please wait" -foregroundcolor Red
  $merged = $csv1 + $csv2

$merged | Export-csv -path $expopath -NoTypeInformation
write-host "Merging completed please check $expopath" -foregroundcolor Green}

Topic: import-csv same header twice, Well – something like this worsk, but what to do when duplicate is found… PowerShell. 11 lines. 1. 2. The simple script below shows how to combine csv files without duplicating headings using C#. This technique assumes that all of the files have the same structure, and that all of them contain a header row. The timings in this post came from combining 8 csv files with 13 columns and a combined total of 9.2 million rows.

Use PowerShell to Remove Duplicate Lines from a CSV File , Use PowerShell to Remove Duplicate Lines from a CSV File Next, I decided to try a similar thing using an array, and once again, things went pear-shaped. I looked that correspond to the column headers from the CSV file. Join me tomorrow when we continue to explore the cool things that Windows  To remove duplicate (between the files to merge) headers from a CSV file, Import-Csv it, pass it to Select-Object, and omit the duplicate header(s)/column(s). Exiting.

How do I combine two CSV files using one column as a key , I loaded csv1 and csv2 into objects using import-csv and the different header values in each file. Then I tried to use Compare-Object on one  Option 1 – CSV files without a header row. The following single command line will combine all CSV files in the folder as a single file titled ‘combined.csv’. copy *.csv combined.csv. If you want to run this from a cmd file, copy the following contents into a text file and save as ‘run.cmd’.

MergeCsv/MergeCsv.psm1 at master · EliteLoser/MergeCsv · GitHub, Svendsen Tech's Merge-Csv is a PowerShell function for merging CSV files and/​or 336 lines (296 sloc) 15.6 KB entry '2only' was not found in all CSV data objects/files. Found in object/file no.: 2 user1 1A1 1B1 same 1A3 2A3 same same nTo remove duplicate (between the files to merge) headers from a CSV file,  Hi all, I have several csv files to be combined together into a single file for editing and analysis. Each csv file has some headers and these headers are the same. As you can imagine, these headers will be included in the file. How do I remove these redundant headers in the Query Editor? The Remo

Comments
  • This is ingeniously simple but comes with a performance caveat: the input objects are effectively recreated, and you invariably have to compare all property values, even though comparing "Time" values would suffice; with large input files, processing can take a long time. Quibble: not an issue in this case, but it's generally safer to use @($csv1) + $csv2 to handle the case where $csv1 happens to contain a single object only. (To lower memory use, also consider sending the objects directly through the pipeline instead: Import-Csv .\csv1.csv, .\csv2.csv | Select -Property * -Unique)
  • try the script by s9suare it works add export csv copy the below script $csv1 = Import-Csv -Path "D:\CSV1.csv" $csv2 = Import-Csv -Path "D:\CSV2.csv" $merged = $csv1 + $csv2 $merged | Select -Property * -Unique | Export-csv -path D:\Merged.csv -NoTypeInformation