--上个月1号如 2024-10-01 00:00:00.000

select DATEADD(month, DATEDIFF(month, 0, GETDATE())-1, 0);  

-下个月1号如2024-12-01 00:00:00.000
select DATEADD(month, DATEDIFF(month, 0, GETDATE())+1, 0);  

--返回2024-11的格式
select     YearMonth  
from Dec_EPInventoryGnameCount;

 -- 转化为2024-11-01 00:00:00.000

select     CONVERT(DATETIME, YearMonth + '-01')
from Dec_EPInventoryGnameCount;

/*
--     删除最近2个月的数据
    DELETE FROM Dec_EPInventoryGnameCount where 
    CONVERT(DATETIME, YearMonth + '-01') >= DATEADD(month, DATEDIFF(month, 0, GETDATE())-1, 0) 
    and CONVERT(DATETIME, YearMonth + '-01') < DATEADD(month, DATEDIFF(month, 0, GETDATE())+1, 0) 
*/