Pon Pure Chemical Interview Questions and Answers

SQL is a relational database management system, while NoSQL is a non-relational database management system.

• SQL is table-based, with a predefined schema, while NoSQL is document, key-value, graph, or wide-column store-based, with dynamic schema.

• SQL is best suited for complex queries and transactions, while NoSQL is better for hierarchical data storage and real-time web applications.

• Examples of SQL databases include MySQL, Oracle, and SQL Server, while examples of NoSQL databas...read more

Use state is a feature in React that allows components to have local state.

• Use state is a React Hook that allows functional components to have state.

• It is used to store and update component-specific data.

• Example: const [count, setCount] = useState(0);

The middle number in a matrix is the number located at the center of the matrix.

• To find the middle number in a matrix, first determine the number of rows and columns in the matrix.

• If the number of rows and columns is odd, the middle number is located at (n/2, n/2) where n is the number of rows or columns.

• If the number of rows and columns is even, there may be multiple middle numbers or the average of the two middle numbers is considered.

Check if two strings are anagrams of each other.

• Create a character count array for each string

• Compare the character count arrays to check if they are equal

• Ignore spaces and consider case sensitivity

Reverse a linked list by changing the pointers direction.

• Start with three pointers: current, previous, and next.

• Iterate through the linked list, updating the pointers to reverse the direction.

• Update the head of the linked list to be the last node visited.