Update RunSQL_SQL_Walkthrough.ps1

Misc/RSQL/RunSQL_SQL_Walkthrough.ps1

@@ -235,7 +235,16 @@ $db_tb = $dbname + ".dbo.nyctaxi_sample"
 Write-host "start loading the data to SQL Server table..." -Foregroundcolor "Yellow"
 try
 {
-    bcp $db_tb in $csvfilepath -t ',' -S $server -f taxiimportfmt.xml -F 2 -C "RAW" -b 200000 -U $u -P $p
+    #The MS SQL Server user and password is specified 
+    if($u -and $p) 
+    { 
+        bcp $db_tb in $csvfilepath -t ',' -S $server -f taxiimportfmt.xml -F 2 -C "RAW" -b 200000 -U $u -P $p
+    } 
+    #The MS SQL Server user and password is not specified - using the Windows user credentials 
+    else 
+    { 
+        bcp $db_tb in $csvfilepath -t ',' -S $server -f taxiimportfmt.xml -F 2 -C "RAW" -b 200000 -T
+    } 
 }
 catch
 {