sql获取年份和月份的日期

Question

I have 2 variables in month and year, and I want to get the year value with these 2 variables. sample, year=2018 and month=5, i want '2018-05-01 00:00:000' Thanks for help.

Answer 1

尝试这个

select cast(cast(year as varchar(max))+'-'+cast(month as varchar(max))+'-01' as datetime)

Answer 2

Try this .. you only have to format the date as 20180501 for SQL SERVER

declare @mm smallint = 5, @yy smallint = 2018

-- USING CONCAT

select cast(concat(cast(@yy as varchar(4)),right(concat('0',@mm),2),'01') as datetime)

--old concatenation method

select cast(cast(@yy as varchar(4))+right(concat('0',@mm),2)+'01' as datetime)

Answer 3

If SQL Server 2012 or higher you can use DATETIMEFROMPARTS

DECLARE @year INT = 2018
DECLARE @month INT = 5

SELECT DATETIMEFROMPARTS(@year, @month, 1, 0, 0, 0, 0)