How to insert a list of values - sql

Question

I’m trying to create a stored procedure that is automatically able to populate a list of players in a team based on the team’s ID.
What I’m trying to do is say that each team has 20 players, their first name matches the team name and their surname should begin with ‘Player’ and end with a number based on a count for the relevant team e.g.
First Name Surname TeamID
AFC Wimbledon Player1 1
AFC Wimbledon Player2 1
AFC Wimbledon Player3 1
--All the way to 20 players
Angers Player1 2
I am not sure how to do this and need little guidance or a code sample so I can look to see how it’s done. I thought I may need an OUTPUT to help solve this but I think my logic is terribly flawed.
Here are the tables:
Team:
TeamID TeamName
1 AFC Wimbledon
2 Angers
3 Ards
Player (currently empty as need this to be inserted to:
PlayerID FirstName Surame TeamID
Below is my PROC currently:
CREATE PROCEDURE [dbo].[Player_Insert]
#FirstName VARCHAR(25) OUTPUT,
#Surname VARCHAR(25) OUTPUT,
#TeamName VARCHAR(50)
AS
SET NOCOUNT ON
BEGIN
DECLARE #TeamID INT, #CountPlayers INT
SELECT #TeamID = TeamID FROM Team WHERE TeamName = #TeamName
SELECT #CountPlayers = count(*) FROM Player WHERE TeamID = #TeamID
IF #CountPlayers >= 20
BEGIN
RAISERROR('Reached the maximum limit of players for %s', 16, 1, #TeamName);
RETURN;
END
SET #FirstName = #TeamName
SET #Surname = 'Player' + #CountPlayers
INSERT INTO Player (FirstName, Surname, TeamID)
VALUES (#FirstName, #Surname, #TeamID)
END
Below is the EXEC PROC:
DECLARE #FirstNameOutput VARCHAR(25)
DECLARE #SurnameOutput VARCHAR(25)
EXEC Player_Insert
#FirstName = #FirstNameOutput OUTPUT,
#Surname = #SurnameOutput OUTPUT,
#TeamId = 1

Answer 1

You will need NUMBERS table .Here are ways to create this
DEMO here :
---Table creattion script
create table #t
(
teamid int,
teamname varchar(100)
)
insert into #t
select '1','AFC Wimbledon'
union all
select '2','Angers'
union all
select '3 ','Ards'
--final query
SELECT teamname as firstname,
'player'+ cast(n as varchar(5)) AS [surname],
teamid
FROM
#t
CROSS APPLY
(select n from numbers nmbr where nmbr.n<=20) b
order by teamid

Answer 2

This should get you what you need.
;WITH TallyTable
AS (
SELECT TOP 20 ROW_NUMBER() OVER (
ORDER BY a.id
) AS N
FROM Master.dbo.SysColumns a
,Master.dbo.SysColumns b
)
INSERT INTO Player (FirstName, Surname, TeamID)
SELECT TeamName AS FirstName
,'Player' + CAST(N AS VARCHAR(2)) AS Surname
,TeamID
FROM Team
CROSS JOIN TallyTable
ORDER BY TeamID, N