Non-repeated SQL Server Random Number

MSSQL Random Number
MSSQL has a function CHAR () that converts int (0-255) ASCII code into characters. Then we can use the following ms SQL statement to randomly generate lower-case, upper-case letters, special characters and numbers.

Uppercase letters:
CHAR (ROUND (RAND () * 25 + 65,0 ))

Lowercase letters:
CHAR (ROUND (RAND () * 25 + 97,0 ))

Special characters:
CHAR (ROUND (RAND () * 13 + 33,0 ))

Number:
CHAR (ROUND (RAND () * 9 + 48, 0 ))
A netizen asked the above questions on SKYPE just now.
Okay, Insus. NET is also trying to write a stored procedure to apply the preceding SQL statement. You can refer to the following stored procedure. If you still have questions, continue with the discussion.Copy codeThe Code is as follows: usp_RandomNumber
Create procedure [dbo]. [usp_RandomNumber]
(
@ Len INT = 1, -- random number of digits
@ Rows INT = 1 -- random pen count
)
AS
BEGIN
DECLARE @ t as table ([Random Number] VARCHAR (MAX ))
DECLARE @ l int = 1, @ r int = 1
WHILE @ R <= @ Rows
BEGIN
DECLARE @ RN varchar (MAX) =''
WHILE @ L <= @ Len -- randomly generate the number of bits per number
BEGIN
SET @ RN = @ RN + CHAR (ROUND (RAND () * 9 + 48, 0 ))
SET @ L = @ L + 1
END
-- If the same random number is generated, it will not be stored
If not exists (SELECT [Random Number] FROM @ t where [Random Number] = @ RN)
BEGIN
Insert into @ t select @ RN -- insert into @ T ([Random Number]) VALUES (@ RN)
SET @ R = @ R + 1 -- records a total of several random numbers.
SET @ L = 1 -- after a random number is generated, the number of digits of the random number is initialized to 1.
END
END
SELECT [Random Number] FROM @ T
END

After you attach the stored procedure to the database, you can execute the stored procedure:Copy codeThe Code is as follows: EXECUTE [dbo]. [usp_RandomNumber] 8, 10

Result (the result obtained by execute is different each time because it is generated randomly)