Invoke-Sqlcmd Join variable as table - powershell

Question

Is there a way to link a PS variable as a table within the Invoke-Sqlcmd?
I've tried LEFT JOIN $psvar as p on T1.ID=P.ID
I updated the script by making a DataTable from the advice of #Cpt.Whale.
# Define DataTable Columns
$tbl = New-Object system.Data.DataTable 'tbl_New'
$newcol = New-Object system.Data.DataColumn emplID,([string]); $tbl.columns.add($newcol)
$newcol = New-Object system.Data.DataColumn adGrp,([string]); $tbl.columns.add($newcol)
# Add data from Excel
$exelWkbk = '.\table.xlsx'
$excelQuery = '
SELECT F1 as emplID
,F2 as pcType
FROM [Sheet1$]
'
$queryOutput = Invoke-ExcelQuery $exelWkbk $excelQuery | Select-Object -Skip 1
$queryOutput | ForEach-Object {
$row = $tbl.NewRow()
$row.tmplID = ($_.emplID)
$row.adGrp = ($_.pcType)
$tbl.Rows.Add($row)
}
# Query SQL Data source joining Excel data
$sqlQuery = "
USE SQLDATABASE;
DECLARE #today as date = GETDATE();
SELECT emp.USER_ID
,wt.HOST
,a.pcType as DevicModel
FROM workstationTable as wt
JOIN employeeTable as emp on wt.USER_ID = emp.USER_ID
JOIN $tbl as a on emp.USER_ID = a.emplID
WHERE emp.NAME is not NULL
"
Invoke-Sqlcmd -Query $sqlQuery -ServerInstance 'dbName' |
Out-GridView

Answer 1

Powershell doesn't have a built-in function for doing SQL-style joins of different datasets. You can use Select-Object calculated properties for simple lookup-table type things, but I prefer using the Join-Object module built on LINQ:
# Gather both data sources into separate list variables:
$sqlData = Invoke-Sqlcmd -ServerInstance 'dbName' -Query '
USE SQLDATABASE;
DECLARE #today as date = GETDATE();
SELECT emp.USER_ID,wt.HOST
FROM workstationTable as wt
JOIN employeeTable as emp on wt.USER_ID = emp.USER_ID
WHERE emp.NAME is not NULL'
$excelData = Invoke-ExcelQuery $exelWkbk $excelQuery | Select-Object -Skip 1
# join the lists on a specific property
$joined = Join-Object -Type AllInLeft `
-Left $sqlData -LeftJoinProperty USER_ID `
-Right $excelData -RightJoinProperty EmplID
$joined | Out-GridView
Or since you're already using Excel, an SQL data connection in the file may be an option.