Like you said SCADA means "Supervisory Control and Data Acquisition". If you want to create only an HMI (Human Machine Interface) you can use javascript, for example using NodeRED, and it's sufficient to connect to the PLC. Or, if you want to read the data from a database, any programming language will do the trick (also javascript). If you plan to use NodeRED keep in mind that you can create a complete SCADA system because it allows you to design a little dashboard but also for example to trigger an insert to you database.