In SQL, date functions are used to manipulate and format dates stored in the database. These functions allow you to perform various operations on dates, such as extracting specific parts of a date or performing mathematical calculations with dates.

Here are some commonly used date functions in SQL:

1. DATE()

The DATE() function is used to extract the date portion from a datetime or timestamp value. It returns the date without the time component.

SELECT DATE(datetime_column) AS date_only
FROM your_table;

2. YEAR(), MONTH(), DAY()

These functions are used to extract the year, month, and day from a date respectively.

SELECT YEAR(date_column) AS year,
       MONTH(date_column) AS month,
       DAY(date_column) AS day
FROM your_table;

3. GETDATE()

The GETDATE() function is used to get the current system date and time.

SELECT GETDATE() AS current_datetime;

4. DATEDIFF()

The DATEDIFF() function calculates the difference between two dates in a specified unit. It returns an integer value.

SELECT DATEDIFF(day, start_date, end_date) AS days_difference
FROM your_table;

5. DATEADD()

The DATEADD() function is used to add or subtract a specified time interval to a date. It can be used to calculate a future or past date based on the provided interval.

SELECT DATEADD(day, 7, start_date) AS future_date
FROM your_table;

Conclusion

Date functions in SQL are powerful tools that allow you to manipulate and format dates stored in a database. Whether you need to extract specific parts of a date or perform calculations with dates, these functions provide the necessary functionality. By using these functions effectively, you can easily work with dates in SQL queries.

#SQL #SELECT #DateFunctions