Вы можете использовать это:
$query = @'
BULK INSERT dbname.dbo.anything FROM ‘Csvpath’
WITH (FIRSTROW = firstrow, FIELDTERMINATOR = ‘fieldterminator’, ROWTERMINATOR = ‘\rowterminator’)
'@
Invoke-SqlCmd2 -ServerInstance '$env:computername\sql1' -Database databasename -Query $query