1.声明变量
declare @name nvarchar(50),@age int
2.为变量赋值
set @name='李小龙'
select @age=18
select '姓名',@name
select '年龄',@age
3.while循环
declare @i int=1
declare @sum int=0
while @i<=100
begin
set @sum=@sum+@i
set @i=@i+1
end
print @sum
4.判断
declare @n int=20
if @n>10
begin
print '@n大于10'
end
else if @n>5
begin
print '@n大于5'
end
else
begin
print '@n小于等于5'
end
declare @i int=1,@sum int=0
while @i<=100
begin
if @i%2<>0
begin
set @sum=@sum+@i
end
set @i=@i+1
end
print @sum
系统全局变量示例,具体F1查看帮助文档
print @@version
print @@error
print @@servername
print @@servicename