显示日期和硬编码日期

Question

我需要将日期值硬编码为“ 01”。因此，预期输出应为：

NULL
20081001
20081201
20080901
20070901
20080601
20070201
....

Answer 1

您可以使用EOMONTH代替核心值1：

select dateadd(day, 1, eomonth(date, -1))
from table t;

Answer 2

--You can Use the YEAR and MONTH functions and cast them 
--to varchar and concat them together with '01' as the day on the end
--with CASE on month in case it is single digit month, prepend zero

SELECT CAST(YEAR([Date]) AS varchar(10)) + CASE WHEN MONTH([Date]) < 10 THEN '0' + CAST(MONTH([Date]) AS varchar(2)) ELSE CAST(MONTH([Date]) AS varchar(2)) END + '01' AS [HardCodedDate]
FROM [Table]

Answer 3

DATEDIFF和DATEADD方法在这里也适用：

DATEADD(MONTH,DATEDIFF(MONTH,0,[date]),0)