SQL GROUP BY with SUM in PowerShell - powershell

Question

What is the simplest way to write this in PowerShell:
SELECT col1, SUM(col3) AS SumOfValues
FROM dbo.Table
GROUP BY col1
How can I combine Group-Object and Measure-Object?
I have found this answer link, but there must be a simpler way.

Answer 1

Like this? With a calculated property at the end.
'id,amount
1,4
1,5
2,4
2,6
3,3
3,5' | convertfrom-csv | group id | select name,
#{n='Sum';e={$_.group.amount | measure -sum | % sum}}
Name Sum
---- ---
1 9
2 10
3 8

Answer 2

You need to use the property GROUP. The script outputs "$group | Format-Table" which shows what the real issue is.
This is what each row of the Group Looks like :
Count Name Group
----- ---- -----
3 a {#{col1=a; col2=x; col3=1}, #{col1=a; col2=x; col3=2}, #{col1=a; col2=x; col3=3}}
See code below :
$input = #"
col1,col2,col3
a,x,1
a,x,2
a,x,3
b,x,4
b,x,5
b,x,6
c,x,7
c,x,8
c,x,9
"#
$table = $input | ConvertFrom-Csv
$table | Format-Table
$groups = $table | Group-Object {$_.col1}
$outputTable = [System.Collections.ArrayList]::new()
foreach($group in $groups)
{
$group | Format-Table
$newRow = New-Object -TypeName psobject
$newRow | Add-Member -NotePropertyName col1 -NotePropertyValue $group.Name
$sum = 0
$group.Group | foreach{$sum += $_.col3}
Write-Host "sum = " $sum
$newRow | Add-Member -NotePropertyName SumOfValues -NotePropertyValue $sum
$outputTable.Add($newRow) | Out-Null
}
$outputTable | Format-Table