1. What is the difference between DELETE, TRUNCATE and DROP? Why Delete is slower than Truncate?
Answer: Click here
2.
How Count() function behaves with different inputs?
Answer: Click here
3.
What is the difference between IN and EXISTS operators?
Answer: Click here
4.
What is the difference between NOT IN and NOT EXISTS operators?
Answer: Click here
5.
How to separate Numeric, Non-numeric and Date values from a Column?
Answer: Click here
6.
What is the difference between UNION and UNION ALL? Why UNION ALL is faster
than UNION?
Answer: Click here
7.
Differentiate between Char, nchar, Varchar, Varchar2 and nvarchar?
Answer: Click here
8.
Execution plan and differences between INSERT and DELETE?
Answer: Click here
9.
When a ROWID will change?
Answer: Click here
10.
What is the difference between ROWNUM and ROW_NUMBER() ?
Answer: Click here
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