SQLserver数据库技术应用：第五章上机

代码及解释

5.1

declare @bookname nchar(16)
set @bookname ='SQLServer数据库编程'
select @bookname

5.2

declare @time1 datetime
set @time1='1/1/2015'

declare @time2 datetime
set @time2='8/5/2022'

select DATEDIFF(DAY,@time1,@time2)

5.3

declare @i int,@sum int
select @i=50,@sum=0
while @i<=100
begin
	if(@i%3=0 and @i%2<>0)
	begin
		set @sum=@i+@sum
	end
	set @i=@i+1
end
select @sum

解释：
1.注意设置值要写set