sql 上个月

时间: 2024-09-20 00:12:46

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To get the previous month in SQL, you can use the DATEADD and DATEPART functions. Here's an example:

SELECT DATEADD(MONTH, -1, GETDATE()) AS PreviousMonth

This query will return the previous month from the current date. If you want to get the previous month from a specific date, you can replace GETDATE() with the desired date.

Note that this query assumes that the previous month is based on the calendar month. If you need to consider a different definition of the previous month (e.g., a rolling 30-day period), you would need to adjust the logic accordingly.