Insert random Data content in SQL Server 2008 - sql-server

Question

I know there are several topics on this, but none of them was suitable for me, that's why I took the chance to ask you again.
I have a table which has columns UserID, FirstName, Lastname.
I need to insert 300 000 records for each column and they have to be unique, for example:
UserID0001, John00001, Doe00001
UserID0002, John00002, Doe00002
UserID0003, John00003, Doe00003
I hope there is an easy way :)
Thank you in advance.
Best,
Lyubo

Answer 1

;with sequence as (
select N = row_number() over (order by ##spid)
from sys.all_columns c1, sys.all_columns c2
)
insert into [Table] (UserID, FirstName, Lastname)
select
'UserID' + right('000000' + cast(N as varchar(10)), 6),
'John' + right('000000' + cast(N as varchar(10)), 6),
'Doe' + right('000000' + cast(N as varchar(10)), 6)
from sequence where N <= 300000

Answer 2

You could use the ROW_NUMBER function to generate different numbers like this:
SQL Fiddle
MS SQL Server 2008 Schema Setup:
CREATE TABLE dbo.users(
Id INT IDENTITY(1,1) PRIMARY KEY CLUSTERED,
user_id VARCHAR(20),
first_name VARCHAR(20),
last_name VARCHAR(20)
);
GO
DECLARE #NoOfRows INT = 7;
INSERT INTO dbo.users(user_id, first_name, last_name)
SELECT 'User_'+n, 'John_'+n, 'Doe_'+n
FROM(
SELECT REPLACE(STR(ROW_NUMBER()OVER(ORDER BY (SELECT NULL))),' ','0') n FROM(
select TOP(#NoOfRows) 1 x from sys.objects A,sys.objects B,sys.objects C,sys.objects D,sys.objects E,sys.objects F,sys.objects G
)X
)N
Query 1:
SELECT * FROM dbo.users
Results:
| ID | USER_ID | FIRST_NAME | LAST_NAME |
-----------------------------------------------------------
| 1 | User_0000000001 | John_0000000001 | Doe_0000000001 |
| 2 | User_0000000002 | John_0000000002 | Doe_0000000002 |
| 3 | User_0000000003 | John_0000000003 | Doe_0000000003 |
| 4 | User_0000000004 | John_0000000004 | Doe_0000000004 |
| 5 | User_0000000005 | John_0000000005 | Doe_0000000005 |
| 6 | User_0000000006 | John_0000000006 | Doe_0000000006 |
| 7 | User_0000000007 | John_0000000007 | Doe_0000000007 |
Just change the #NoOfRows to 300000 to get the number of rows you are looking for.

Answer 3

I've adapted a script found in this article:
DECLARE #RowCount INT
DECLARE #RowString VARCHAR(14)
DECLARE #First VARCHAR(14)
DECLARE #LAST VARCHAR(14)
DECLARE #ID VARCHAR(14)
SET #ID = 'UserID'
SET #First = 'John'
SET #Last = 'Doe'
SET #RowCount = 1
WHILE #RowCount < 300001
BEGIN
SET #RowString = CAST(#RowCount AS VARCHAR(10))
SET #RowString = REPLICATE('0', 6 - DATALENGTH(#RowString)) + #RowString
INSERT INTO TestTableSize (
UserID
,FirstName
,LastName
)
VALUES
(#ID + #RowString
, #First + #RowString
, #Last + #RowString)
SET #RowCount = #RowCount + 1
END