how to read data from other tables with union based SQL Injections

Once you find an SQL Injection vulnerability, you can use an union based SQL Injection to read data from other tables. But what if you want to read two columns, but can only have one value returned?

In this case you can concatenate multiple columns into one to read more data than would otherwise be possible.

More SQL Injection challenges: https://www.youtube.com/watch?v=Nt3VRPlJ-pw&list=PLUqaMXbg_0-HS9QaNdozmozuLfUH-OLuG

Full Portswigger Academy Walkthrough (Live): https://www.youtube.com/playli....st?list=PLUqaMXbg_0-
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