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Reversing a String using a PostgreSQL Function


Function to Reverse a String

Write a PostgreSQL function to reverse a given string.

Solution:

-- Create a function named reverse_string that takes a text input and returns a text value
CREATE FUNCTION reverse_string(str TEXT) RETURNS TEXT AS $$
BEGIN
    -- Return the reversed version of the input string using the REVERSE function
    RETURN REVERSE(str);
END;
-- Specify the language used in the function as PL/pgSQL
$$ LANGUAGE plpgsql;

Explanation:

  • Purpose of the Query:
    • Returns the reversed form of a string.
  • Real-World Application:
    • Useful in data validation, cryptography, and text processing.

For more Practice: Solve these Related Problems:

  • Write a PostgreSQL function that checks if a given string is a palindrome.
  • Write a PostgreSQL function that removes all vowels from a given string.
  • Write a PostgreSQL function that returns only the first half of a given string.
  • Write a PostgreSQL function that converts a string into Title Case (capitalizing the first letter of each word).


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Previous PostgreSQL Exercise: Function to Count Employees in a Department.
Next PostgreSQL Exercise: Function to return the Current Date and Time.

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