Question

给出两个csv文件：

File1.csv
SKU,Description,UPC
101,Saw,101010103
102,Drill,101010102
103,Screw,101010101
104,Nail,101010104

File2.csv
SKU,Description,UPC
100,Light,101010105
101,Saw,101010103
104,Nail,101010104
106,Battery,101010106
108,Bucket,101010114

我想创建一个新的csv文件，我们将调用UpdatedList.csv，它包含来自File1.csv的每个条目减去SKU在File1.csv和File2.csv中的所有行。在这种情况下，UpdatedList.csv看起来像

UpdatedList.csv
"SKU","Description","UPC"
"102","Drill","101010102"
"103","Screw","101010101"

以下代码将按照我的要求行事，但我相信有更有效的方法。我怎么能没有循环呢？我的代码如下。

#### Create a third file that has all elements of file 1 minus those in file 2 ###
$FileName1 = Get-FileName "C:\LowInventory"
$FileName2 = Get-FileName "C:\LowInventory"
$f1 = ipcsv $FileName1
$f2 = ipcsv $FileName2
$f3 = ipcsv $FileName1
For($i=0; $i -lt $f1.length; $i++){
For($j=0; $j -lt $f2.length; $j++){
if ($f1[$i].SKU -eq $f2[$j].SKU){$f3[$i].SKU = 0}
}
}
$f3 | Where-Object {$_.SKU -ne "0"} | epcsv "C:\LowInventory\UpdatedList.csv" -NoTypeInformation
Invoke-Item "C:\LowInventory\UpdatedList.csv"
################################

Answer 1

通过利用Group-Object cmdlet，您可以在没有循环的情况下执行此操作：

$f1 = ipcsv File1.csv;
$f2 = ipcsv File2.csv;
$f1.ForEach({Add-Member -InputObject $_ 'X' 0}) # So we can select these after
$f1 + $f2                  | # merge our lists
    group SKU              | # group by SKU
    where {$_.Count -eq 1} | # select ones with unique SKU
    select -expand Group   | # ungroup
    where {$_.X -eq 0}       # where from file1

比较两个csv文件并从原始文件中扣除匹配

1 个答案: