Truspeq Consulting Application Developer Interview Questions, Process, and Tips

Decode function is used in PL/SQL to conditionally return a value based on specified conditions.

• Decode function compares an expression with a series of search values and returns a result when a match is found.

• It is commonly used to replace multiple IF-THEN-ELSE statements.

• Syntax: DECODE(expression, search_value1, result1, search_value2, result2, ..., default_result)

• Example: DECODE(salary, 1000, 'Low', 2000, 'Medium', '...read more

Procedures and functions are both subprograms in programming languages, but they differ in their return values.

• Procedures do not return a value, while functions do.

• Procedures are used to perform actions or tasks, while functions are used to calculate and return a value.

• Functions can be used in expressions, while procedures cannot.

• Functions have a return statement, while procedures do not necessarily have one.

• Procedures...read more

Collections are data structures that store multiple elements of the same type. They provide methods for adding, removing, and accessing elements.

• ArrayList: A resizable array that stores elements in contiguous memory.

• LinkedList: A doubly-linked list that allows efficient insertion and deletion at any position.

• HashSet: A set that stores unique elements in no particular order.

• TreeSet: A set that stores unique elements in ...read more

Errors are handled through exception handling mechanisms in the code.

• Errors are caught using try-catch blocks.

• Exceptions are thrown when an error occurs.

• Error messages are logged or displayed to the user for troubleshooting.

• Error handling can involve retrying failed operations or providing alternative paths.

• Common error handling techniques include logging, error codes, and error notifications.