Calculate Days Between Two Dates using a PostgreSQL Function
Function to Get the Number of Days Between Two Dates
Write a PostgreSQL function that calculates the number of days between two given dates.
Solution:
-- Create a function named days_between that takes two dates as input and returns an integer
CREATE FUNCTION days_between(start_date DATE, end_date DATE) RETURNS INT AS $$
BEGIN
-- Calculate the difference in days between the end_date and start_date
RETURN end_date - start_date;
END;
-- Specify the language used in the function as PL/pgSQL
$$ LANGUAGE plpgsql;
Explanation:
- Purpose of the Query:
- Calculates the difference in days between two dates.
- Real-World Application:
- Used in event planning, payroll processing, and analytics.
For more Practice: Solve these Related Problems:
- Write a PostgreSQL function that calculates the number of weekdays between two given dates.
- Write a PostgreSQL function that calculates the number of months between two given dates.
- Write a PostgreSQL function that finds how many days have passed since January 1, 2000.
- Write a PostgreSQL function that determines if a given date falls on a weekend.
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Previous PostgreSQL Exercise: Function to return the Current Date and Time.
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