Notice: Undefined index: factnum in C:\Apache24\htdocs\real\ventas\selecciona.php on line 28

Notice: Undefined index: seleccion in C:\Apache24\htdocs\real\ventas\selecciona.php on line 29

Fatal error: Uncaught PDOException: SQLSTATE[42000]: [Microsoft][ODBC Driver 17 for SQL Server][SQL Server]Incorrect syntax near the keyword 'WHERE'. in C:\Apache24\htdocs\real\ventas\selecciona.php:35 Stack trace: #0 C:\Apache24\htdocs\real\ventas\selecciona.php(35): PDOStatement->execute() #1 {main} thrown in C:\Apache24\htdocs\real\ventas\selecciona.php on line 35