OOPs Boxing vs Unboxing Find 2nd highest salary Joins Lifecycle hooks Write the code written in constructor while calling an API with the service.

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The question covers topics like OOPs, boxing vs unboxing, finding the 2nd highest salary, joins, lifecycle hooks, and calling an API with a service in the constructor.

Boxing vs unboxing: Boxing is the process of converting a value type to a reference type, while unboxing is the opposite. Example: int i = 10; object obj = i; // boxing int j = (int)obj; // unboxing
Finding 2nd highest salary: Use SQL query like 'SELECT MAX(salary) FROM employees WHERE salary < (SELECT MAX(salary) FROM employees)'.
Joins: Types of joins include INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN. Example: SELECT * FROM table1 INNER JOIN table2 ON table1.id = table2.id
Lifecycle hooks: In Angular, lifecycle hooks include ngOnInit, ngOnDestroy, ngOnChanges, etc. They allow you to tap into specific moments in a component's lifecycle.
Calling API in constructor: It is not recommended to call APIs in a constructor as it can lead to unexpected behavior. Instead, use ngOnInit in Angular or useEffect in React.

OOPs Boxing vs Unboxing Find 2nd highest salary Joins Lifecycle hooks Write the code written in constructor while calling an API with the service.

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