What is mean by Foreign key & their functionality? How we can create? Oracle SQL Interview Question

In our Channel describe on Oracle SQL Interview Question and Answers || IICS Tutorial || Data Warehousing Concept. Please check below link for more oracle sql questions, https://wordpress.com/post/shobateclearningoraclesqlquestion.wordpress.com/7 Please check below link for IICS tutorial series, https://wordpress.com/post/shobateclearningoraclesqlquestion.wordpress.com/35 I have created playlist for Oracle SQL, IICS, DWH. Please check playlist u will get more knowledge on these (Oracle SQL, IICS, DWH).