日期:2014-05-16 浏览次数:20586 次
---创建模拟数据
create table bigstr(
id int identity(1,1) not null,
usefuldata nvarchar(max)
)
insert into bigstr(usefuldata) values('2245.9 2246.0 2246.1 2246.2 2246.3 2246.4 2246.5 2246.6 2246.7 2246.8 2246.9 2247.0 2247.1 2247.2 2247.3 2247.4 2247.5 2247.6 2247.7 2247.8 2247.9 2248.0 2248.1 2248.2 2248.3 2248.4 2248.5 2248.6 2248.7 2248.8 2248.9 2249.0 2249.1 2249.2 2249.3 2249.4 2249.5 2249.6 2249.7 2249.8 2249.9 2250.0 2250.1 2250.2 2250.3 2250.4 2250.5 2250.6 2250.7 2250.8 2250.9 2251.0 2251.1 2251.2 2251.3 2251.4 2251.5 2251.6 2251.7 2251.8 2251.9 2252.0 2252.1 2252.2 2252.3 2252.4 2252.5 2252.6 2252.7 2252.8 2252.9 2253.0 2253.1 2253.2 2253.3 2253.4 2253.5 2253.6 2253.7 2253.8 2253.9 2254.0 2254.1 2254.2 2254.3 2254.4 2254.5 2254.6 2254.7 2254.8 2254.9 2255.0 2255.1 2255.2 2255.3 2255.4 2255.5 2255.6 2255.7 2255.8 2255.9 2256.0 2256.1 2256.2 2256.3 2256.4 2256.5 2256.6 2256.7 2256.8 2256.9 2257.0 2257.1 2257.2 2257.3 2257.4 2257.5 2257.6 2257.7 2257.8 2257.9 2258.0 2258.1 2258.2 2258.3 2258.4 2258.5 2258.6 2258.7 2258.8 2258.9 2259.0 2259.1 2259.2 2259.3 2259.4 2259.5 2259.6 2259.7 2259.8 2259.9 2260.0 2260.1 2260.2 2260.3 2260.4 2260.5 2260.6 2260.7 2260.8 2260.9 2261.0 2261.1 2261.2 2261.3 2261.4 2261.5 2261.6 2261.7 2261.8 2261.9 2262.0 2262.1 2262.2 2262.3 2262.4 2262.5 2262.6 2262.7 2262.8 2262.9 2263.0 2263.1 2263.2 2263.3 2263.4 2263.5 2263.6 2263.7 2263.8 2263.9 2264.0 2264.1 2264.2 2264.3 2264.4 2264.5 2264.6 2264.7 2264.8 2264.9 2265.0 2265.1 2265.2 2265.3 2265.4 2265.5 2265.6 2265.7 2265.8')
select usefuldata from bigstr
go
---创建存储过程求平均值
create proc [dbo].[proc_bigavg](@c nvarchar(max),@split varchar(2),@v float output)
as
declare @t table(col float)
begin
while(charindex(@split,@c)<>0)
begin
insert @t(col) values (substring(@c,1,charindex(@split,@c)-1))
set @c = stuff(@c,1,charindex(@split,@c),'')
end
insert @t(col) values (convert(float ,convert (nvarchar,@c)))
select @v=AVG(col) from @t
end
---演示存储过程求平均值