如何使用 Azure SQL 获取上个月？

Question

I'm starting on azure SQL and I want to convert a string into a date and then retrieve the two months before that date.

I tried to use DATEADD(month,-2,sysdatetime()) to get the previous two months but dateadd doesn't work. "This function is neither a registered temporary function nor a permanent function registered in the database"

Thank you for your help

Answer 1

The DATEADD() function is supported in Azure SQL database:

I tested it in my Azure SQL database and it works well:

DECLARE @datetime2 datetime2 = sysdatetime();    
SELECT DATEADD(month,-2,@datetime2) as month

The point is what's the date string look like or where you call the function. Maybe you can share us your whole SQL statements

Here's the official example:

DECLARE @datetime2 datetime2 = '2007-01-01 13:10:10.1111111';
SELECT 'month',DATEADD(month,1,@datetime2)    

Hope this helps.