Managing several users data into the same table
As mentioned earlier, you can use parameters for security reasons.
Maybe you've got one table with several clients' data, but you want to let each client only access its data.
Well, you can simply do the same as seen previously, but using as a parameter an encrypted key of your own that is unique to each client, and complicated enough so they can't guess other client's key.
To maximize security in this case, please set the default value to -1, so by default users don't see anything until they've inputted their key.
Not ideal for them, but a good solution for you.
Playing with dataviz
On the same dataviz, let's create another parameter, but numerical (decimal) this time. We're going to call it play with numbers (why not), and constrain it in a 0 to 10 range as follow: