Tata Consultancy Services Oracle PlSql Developer interview questions

What is faster subquery or CTE What is veiw and materialized view if we delete a table what will be the result of select * from the view created on the table what are analytical functions order salary based on Rownumber,rank,denserank procedure for a palindrome write a syntax of procedure with all blocks what are indexes and its type merge statement (can we use a same table in merge) left join and inner join and right join for below Table 1 Table 2 column 1 column1 1 1 1 0 0 null null null second highest salary

Records type , index , query tuning