PortSwigger: SQL injection attack, querying the database type and version on Oracle

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Hello friends and today HaXeZ is looking at the 5th SQL Injection lab on Portswigger Web Security Academy. This lab requires you to perform a UNION-based SQL injection to retrieve the database version string. We can use the same techniques that we have developed so far.
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Dumb question, but how did you know to input BANNER for the first field? Wouldn't you have to enumerate if BANNER was a column name?

godzab