Get Ahead with Oracle: How to Calculate the First Day of Next Month（oracle下月第一天）

Oracle enables you to use the NEXT_DAY function to easily calculate the first day of the next month. This is a handy feature if you are working with date related calculations in your Oracle database. This article will explore how to calculate the first day of the next month in Oracle and provide you with some examples to help make the process simpler.

First, it’s important to understand that the NEXT_DAY function takes two parameters: a date and the name of a weekday. The latter can be either a full day name (e.g. Monday) or an abbreviation (e.g. Mon). The NEXT_DAY function returns the first upcoming weekday that follows the given date, which you can use to calculate the start of the next month.

Using the NEXT_DAY function to calculate the first day of a month can be done in two steps. The first step is to get the first day of the current month. This is done by passing the date parameter as CURRENT_DATE and then passing the full name or abbreviation (Mon or Monday) of the day that corresponds to the first day of the month. For example, if the current month begins on a Wednesday, you would pass the parameter Wednesday (or Wed) to the NEXT_DAY function.

The second step is to add one month to the calculated first day of the current month. The ADD_MONTHS function can be used to achieve this. This function takes the calculated first day of the current month as the date parameter and then adds the number of months specified. You can then use this to get the first day of the next month.

In example, let’s suppose you wanted to calculate the first day of the month three months ahead of the current date. You would first use the NEXT_DAY function to get the first day of the current month. Then you would use the ADD_MONTHS function to add three months to this date and finally use the NEXT_DAY function to get the first day of the next month. The code would look something like this:

SELECT NEXT_DAY(CURRENT_DATE, ‘Wednesday’) AS FirstDayOfMonth,

ADD_MONTHS(NEXT_DAY(CURRENT_DATE, ‘Wednesday’), 3) AS FirstDayOfNextMonth3

FROM dual;

By using the NEXT_DAY and ADD_MONTHS functions, you can easily calculate the first day of the next month in Oracle. With these functions, you can quickly calculate the start of the month for any number of months ahead of the current date. This allows you to quickly and easily manage date related calculations in your Oracle database.