How do you retrieve the last day of each month in SQL?

You can use the DATEADD function in SQL along with the DATEPART function to get the last day of each month. You can refer to the following example code for more details.

SELECT DATEADD(day, -1, DATEADD(month, 1, DATEADD(day, 1, DATEADD(month, DATEDIFF(month, 0, GETDATE()), 0))))

The code above first uses the DATEDIFF function to calculate the number of months between the current date and January 1, 1900. Then it uses the DATEADD function to find the first day of the current month, adds one month to get the first day of the following month, and finally subtracts one day to get the last day of the current month.