- Waterfall model - What is cursor in SQL - Normalization and denormalization - SDLC Lifecycle - Why we need SQL - Function and procedure in SQL - What are the main blocks of T-sql or Pl-sql - What is a Threading - Method overloading and overriding - Class and objects - Why java is used and not Dot net for application development - Column in left table is NULL and Column in right table is NULL, if we compare both then what will be the final output?