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).

Go to:

• Comprehensive Guide to writing PL/pgSQL Functions in PostgreSQL Exercises Home. ↩
• PostgreSQL Exercises Home ↩

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