如何生成随机数矩阵，其中每行中的值与T-SQL中的X相加？
解决方案矩阵应该是动态的：
create proc RandomNumberGenerator （ @rows int ，@ cols int ，@ fleumtotal float ） 如 ....
答案 0 :(得分：0)
首先创建一个UDF ...
CREATE FUNCTION [dbo].[_ex_fn_SplitToTable] (@str varchar(5000), @sep varchar(1) = null)
RETURNS @ReturnVal table (n int, s varchar(5000))
AS
/*
Alpha Test
-----------
select * from [dbo].[_ex_fn_SplitToTable_t2]('a b c d e',' ')
*/
BEGIN
if @sep = ' '
begin
set @sep = CHAR(167)
set @str = REPLACE(@str,' ',CHAR(167))
end
declare @str2 varchar(5000)
declare @sep2 varchar(1)
if LEN(ISNULL(@sep,'')) = 0
begin
declare @i int
set @i = 0
set @str2 = ''
declare @char varchar(1)
startloop:
set @i += 1
--print @i
set @char = substring(@str,@i,1)
set @str2 = @str2 + @char + ','
if LEN(@str) <= @i
goto exitloop
goto startloop
exitloop:
set @str2 = left(@str2,LEN(@str2) - 1)
set @sep2 = ','
--print @str2
end
else
begin
set @str2 = @str
set @sep2 = @sep
end
;WITH Pieces(n, start, stop) AS (
SELECT 1, 1, CHARINDEX(@sep2, @str2)
UNION ALL
SELECT n + 1, stop + 1, CHARINDEX(@sep2, @str2, stop + 1)
FROM Pieces
WHERE stop > 0
)
insert into @ReturnVal(n,s)
SELECT n,
SUBSTRING(@str2, start, CASE WHEN stop > 0 THEN stop-start ELSE 5000 END) AS s
FROM Pieces option (maxrecursion 32767)
RETURN
END
GO
然后，创建此存储过程...
CREATE PROC [dbo].[RandomNumberGenerator]
(
@Pockets int = 6,
@SumTo float = 100,
@i_iterations int = 100
)
/*
ALPHA TEST
----------
exec RandomNumberGenerator 10, 100, 500
*/
AS
if object_id('tempdb..#_Random_00') is not null drop table #_Random_00
declare @columnstring varchar(max) = (SELECT REPLICATE('c ',@Pockets) as Underline)
print @columnstring
if object_id('tempdb..#_Random_columns') is not null drop table #_Random_columns
select s+CONVERT(varchar,dbo.PadLeft(convert(varchar,n),'0',3)) cols
into #_Random_columns
from [dbo].[_ex_fn_SplitToTable](@columnstring,' ') where LEN(s) > 0
-- ===========================
--select * from #_Random_columns
-- ===========================
declare @columns_sql varchar(max)
set @columns_sql =
(
select distinct
stuff((SELECT distinct + cast(cols as varchar(50)) + ' float, '
FROM (
select cols
from #_Random_columns
) t2
--where t2.n = t1.n
FOR XML PATH('')),3,0,'')
from (
select cols
from #_Random_columns
) t1
)
set @columns_sql = LEFT(@columns_sql,LEN(@columns_sql) - 1)
print @columns_sql
declare @sql varchar(max)
set @sql = 'if object_id(''tempdb..##_proctable_Random_01'') is not null drop table ##_proctable_Random_01 '
print @sql
execute(@sql)
set @sql = 'create table ##_proctable_Random_01 (rowid int,' + @columns_sql + ')'
print @sql
execute(@sql)
declare @TotalOfRand float
declare @i_inner int
declare @i_outer int
set @i_outer = 0
start_outer:
set @i_outer = @i_outer + 1
set @i_inner = 0
declare @sumstring varchar(max)
set @sumstring = ''
start_inner:
set @i_inner = @i_inner+1
set @sumstring = @sumstring + CONVERT(varchar, rand()) + ','
if @i_inner >= @Pockets
goto exit_inner
goto start_inner
exit_inner:
set @TotalOfRand = ( select sum(convert(float,s)) from dbo._ex_fn_SplitToTable(@sumstring,',') )
declare @sumstring_quotient varchar(max)
set @sumstring_quotient = replace(@sumstring,',', '/' + Convert(varchar,@TotalOfRand) + '*' + convert(varchar,@SumTo) + ',')
set @sumstring_quotient = LEFT(@sumstring_quotient,len(@sumstring_quotient) - 1)
print @sumstring_quotient
set @sql = '
insert into ##_proctable_Random_01
select
( select count(*) + 1 from ##_proctable_Random_01 ) rowid,' + @sumstring_quotient
execute(@sql)
if @i_outer >= @i_iterations
goto exit_outer
goto start_outer
exit_outer:
select * from ##_proctable_Random_01
drop table ##_proctable_Random_01
GO