sqlserver2019 单表插入一亿条数据

sqlserver2019 单表插入一亿条数据，由存储过程执行该过程

新建表：
CREATE TABLE [dbo].[ceshi](
[ID] [int] IDENTITY(1,1) NOT NULL,
[name] nchar NULL,
[sort] nchar NULL,
[createtime] [datetime] NULL,
[createby] nvarchar NULL,
CONSTRAINT [PK_ceshi] PRIMARY KEY CLUSTERED
(
[ID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, OPTIMIZE_FOR_SEQUENTIAL_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]

存储过程：
CREATE PROCEDURE [dbo].[xunhuanshuju]

AS
BEGIN

declare @n int =100000000;

DECLARE @RandomStr VARCHAR(100), @CharPool NVARCHAR(789) --@RandomStr是每次随机的字符累加的值，@CharPool是产生随机字符的字符序列

DECLARE @Idx INTEGER, @Counter INTEGER – @Idx是循环次数，@Counter 是产生随机字符的位置

  select @CharPool=name from baijiaxing  --设置随机序列