MySQL | LAST_DAY() Function

The LAST_DAY() function in MySQL returns the last day of the specified month for the provided date. It's useful when you want to determine the end date of a month for a given date.

Syntax:

LAST_DAY(date)

date: The date or datetime expression from which you want to find the last day of the month.

Examples:

Getting the Last Day of the Current Month:
```
SELECT LAST_DAY(NOW());
```
Getting the Last Day of a Specific Date:
```
SELECT LAST_DAY('2023-02-15');
```
This would return 2023-02-28 or 2023-02-29 depending on whether 2023 is a leap year or not.
Getting the Last Day of a Month from a Table Column: Assume you have a table sales with a column sale_date. To get the last day of the month for each sale date, you'd do:
```
SELECT sale_date, LAST_DAY(sale_date) as last_day_of_month FROM sales;
```

Notes:

The returned date will always be in the format YYYY-MM-DD, regardless of the input date's format.
If the provided date is invalid or NULL, the LAST_DAY() function will return NULL.

The LAST_DAY() function is particularly useful in financial applications, reporting, and other scenarios where month-end calculations or reporting periods are necessary.

MySQL LAST_DAY() function example:
- The LAST_DAY() function in MySQL is used to return the last day of the month for a given date.
```
SELECT LAST_DAY('2023-04-15') AS LastDayOfMonth;
```
How to use LAST_DAY() function in MySQL:
- To use LAST_DAY(), provide a date as an argument, and it will return the last day of that month.
```
SELECT LAST_DAY(NOW()) AS LastDayOfCurrentMonth;
```
MySQL get last day of month:
- Use LAST_DAY() to get the last day of the month.
```
SELECT LAST_DAY('2023-08-21') AS LastDayOfMonth;
```
Extract month end date in MySQL:
- Extracting the month-end date using LAST_DAY().
```
SELECT LAST_DAY('2023-11-10') AS MonthEndDate;
```
MySQL date functions LAST_DAY() usage:
- Demonstrating the usage of LAST_DAY() in date functions.
```
SELECT LAST_DAY(NOW()) AS LastDay, MONTH(NOW()) AS CurrentMonth;
```
Calculate end of month in MySQL:
- Calculating the end of the month using LAST_DAY().
```
SELECT LAST_DAY('2023-05-12') AS MonthEnd;
```
MySQL last day of current month:
- Getting the last day of the current month.
```
SELECT LAST_DAY(NOW()) AS LastDayOfCurrentMonth;
```

Using LAST_DAY() in WHERE clause MySQL:

Using LAST_DAY() in a WHERE clause.

SELECT * FROM your_table WHERE your_date_column = LAST_DAY('2023-07-15');

Get last day of quarter in MySQL:

Using LAST_DAY() to get the last day of the quarter.

SELECT LAST_DAY('2023-09-15' + INTERVAL QUARTER('2023-09-15') QUARTER) AS LastDayOfQuarter;

MySQL LAST_DAY() function vs other date functions:
- Comparing LAST_DAY() with other date functions like CURDATE().
```
SELECT LAST_DAY(NOW()) AS LastDay, CURDATE() AS CurrentDate;
```
Examples of MySQL date manipulation with LAST_DAY():
- Examples showcasing various date manipulations using LAST_DAY().
```
SELECT 
  LAST_DAY(NOW()) AS LastDay, 
  LAST_DAY(NOW() - INTERVAL 1 MONTH) AS LastDayOfPreviousMonth;
```
MySQL extract year and month from date with LAST_DAY():
- Extracting the year and month from a date using LAST_DAY().
```
SELECT 
  YEAR(LAST_DAY(NOW())) AS CurrentYear, 
  MONTH(LAST_DAY(NOW())) AS CurrentMonth;
```
MySQL LAST_DAY() with timestamp:
- Using LAST_DAY() with a timestamp instead of a date.
```
SELECT LAST_DAY(TIMESTAMP('2023-12-29 12:34:56')) AS LastDay;
```