IF SQL #ID EXISTS, DO NOT INPUT? - sql

Question

I made a Powershell script that inputs data from a Powershell O365 Health Module into a SQL Database by using a Foreach loop. The issue I am having now is that each time I run the script (every 30 minutes or something), it creates new lines into my database, and most of the time it's duplicates.
One of the values (#ID) is unique, so what I want to do is:
If #ID FROM table exist, DO Nothing. So it should then only skip that line in the Foreach statement and continue into the next one and continue writing the others into the table.
I am kinda new to SQL so I am a bit unsure how to do this.
Here's my script:
$o365user = 'user#company.com'
Import-Module O365ServiceCommunications
$Credential = Get-Credential $o365user
$Session = New-SCSession -Credential $Credential -locale en-US
$SqlConnection = New-Object System.Data.SqlClient.SqlConnection;
$SqlConnection.ConnectionString = 'Server=testcoresight;Database=O365Health;Integrated Security=True'
$SqlConnection.Open();
$sql = #'
INSERT INTO O365Events(
StartTime,
EndTime,
ID,
EventType,
Service,
Status
)
VALUES (
#StartTime,
#EndTime,
#ID,
#EventType,
#Service,
#Status
)
'#
$cmd = $SqlConnection.CreateCommand()
$cmd.CommandTimeout = 15
$cmd.CommandText = $sql
[void]$cmd.Parameters.Add('#StartTime',[string])
[void]$cmd.Parameters.Add('#EndTime',[string])
[void]$cmd.Parameters.Add('#ID',[string])
[void]$cmd.Parameters.Add('#EventType',[string])
[void]$cmd.Parameters.Add('#Service',[string])
[void]$cmd.Parameters.Add('#Status',[string])
#Gets O365 Health Status. Shows Incident types for the past 7 days and sends them to the SQL DB.
Get-SCEvent -SCSession $Session -EventTypes Incident -pastdays 7 |
ForEach-Object {
Try{
$cmd.Parameters['#StartTime'].Value = if($_.StartTime){$_.StartTime}else{''}
$cmd.Parameters['#EndTime'].Value = if ($_.EndTime) { $_.EndTime } else { '' }
$cmd.Parameters['#ID'].Value = if ($_.ID) { $_.ID } else { '' }
$cmd.Parameters['#EventType'].Value = if ($_.EventType) { $_.EventType } else { '' }
$cmd.Parameters['#Service'].Value = if ($_.AffectedServiceHealthStatus.ServiceName) { $_.AffectedServiceHealthStatus.ServiceName } else { '' }
$cmd.Parameters['#Status'].Value = if ($_.Status) { $_.Status } else { '' }
Write-Host ID Loaded: $_.ID -ForegroundColor green
if ($cmd.ExecuteNonQuery() -ne 1) {
Write-Host Insert failed: $_.ID
}
}
Catch{ Write-Host $_ }
}
$SqlConnection.Close()
What I believe I have to do is add something like:
IF #ID EXISTS FROM O365Events skip

Answer 1

INSERT INTO O365Events(
StartTime,
EndTime,
ID,
EventType,
Service,
Status
)
SELECT
#StartTime,
#EndTime,
#ID,
#EventType,
#Service,
#Status
WHERE NOT EXISTS (SELECT null FROM O365Events WHERE ID = #ID)
Or, really, you could just make the ID the promary key and handle the error that occurs when you try to insert a duplicate