What are virtual columns in Oracle?

#sql #virtualcolumns #oraclesql #sqldeveloper #sqldevelopment #sqldeveloper #oraclesql #learnsql #sql #oracle #oraclevirtualcolumns #sqlforbeginners #sqlinterview #sqlinterviewquestionsandanswers #sqlinterviewquestions #oracleInterviewconcepts #sqlinterviewconcepts