Question

我需要将带有随机@N值的float行插入到一个表中，并将每个新插入行的ID用于另一个INSERT。我需要在存储过程中做这一切。例如：

CREATE PROCEDURE Proc
    @N int
AS

-- START LOOP, REPEAT @N TIMES
INSERT INTO [T1]
    ([Value])
VALES
    (<random_float>)

INSERT INTO [T2]
    ([ValueID])
VALUES
    (@@IDENTITY)
-- END LOOP

END
GO

提前致谢。

Answer 1

没有循环，一个插入

;WITH cte AS
(  --there are easier ways to build a numbers table
   SELECT
       ROW_NUMBER() OVER (ORDER BY (select 0)) AS rn
   FROM
      sys.columns c1 CROSS JOIN sys.columns c2 CROSS JOIN sys.columns c3
)
INSERT INTO [T1] ([Value])
OUTPUT INSERTED.ID INTO T2  -- direct insert to T2
SELECT RAND(CHECKSUM(NEWID()))
FROM cte
WHERE rn <= @N;

Answer 2

目前还不完全清楚你要做什么。你的意思是这样的：

create table dbo.RandomTable
( 
    rowid int not null PRIMARY KEY,        
    pure_random float null,
)

declare @row int
set @row = 1
while (@row <= @N)
begin
   insert into dbo.RandomTable (rowid, pure_random)
   values (@row, rand())
   set @row = @row + 1
end

[我不主张使用循环;这不是最有效的方式。这就是海报要求的形式......]

Answer 3

CREATE TABLE [T1]
(
    [ValueID] INT IDENTITY(1,1),
    [Value] FLOAT
)
GO

CREATE TABLE [T2]
(
    [ValueID] INT
)
GO

CREATE PROCEDURE [Proc]
    @N int
AS
BEGIN
    DECLARE @i INT = 0;

    WHILE (@i < @N)
    BEGIN
        INSERT INTO [T1]
            ([Value])
        SELECT RAND()

        INSERT INTO [T2]
            ([ValueID])
        VALUES
            (SCOPE_IDENTITY())

        SET @i += 1
    END
END
GO

TRUNCATE TABLE T1
TRUNCATE TABLE T2
EXEC [Proc] @N = 10

请参阅WHILE (Transact-SQL)和SCOPE_IDENTITY (Transact-SQL)。

将N个随机值插入表中

3 个答案: