SQL2008使用CTE递归查询批量插入500万数据

CREATE TABLE Customers (CustomerID INT primary key identity(1,1),  
CustomerNumber CHAR(4),  
CustomerName VARCHAR(50),  
CustomerCity VARCHAR(20))  
GO  

/*使用一般的批量循环插入*/
declare @maxSum int,
        @customernum nvarchar(50),
        @customername nvarchar(50),
        @city nvarchar(50),
        @paytime datetime
set @maxSum=1
set @customernum='0000'
set @customername='Customer 0'
set @city='X-City'
while @maxSum<5000000  /*一般方法循环插入500万条数据 10分钟以上*/
begin
   insert into Customers (CustomerNumber,CustomerName,CustomerCity) 
                 values(@customernum,@customername,@city)
   set @maxSum=@maxSum+1
end
select [500万数据量插入完毕，共花费时间(毫秒)]=datediff(ms,@paytime,getdate())  

/*使用CTE递归循环插入 运用CTE递归插入，速度较快*/  
TRUNCATE table Customers  
GO 
DBCC DROPCLEANBUFFERS  
DBCC FREEPROCCACHE  
  
SET STATISTICS IO ON;  
SET STATISTICS TIME ON;  
GO  
  
DECLARE @d Datetime  
SET @d=getdate();  
  
WITH Seq (num,CustomerNumber, CustomerName, CustomerCity) AS  
(SELECT 1,'0000','Customer 0',cast('X-City' as NVARCHAR(20))  
UNION ALL  
SELECT num + 1,'0000','Customer 0',  
cast(CHAR(65 + (num % 26)) + '-City' AS NVARCHAR(20))  
FROM Seq  
WHERE num <= 5000000  /*CTE批量递归500万数据量 用时一般大概3分钟 因个人电脑而已*/
)  
INSERT INTO Customers (CustomerNumber, CustomerName, CustomerCity)  
SELECT CustomerNumber, CustomerName, CustomerCity  
FROM Seq  
OPTION (MAXRECURSION 0)  
  
select [500万数据量插入完毕，共花费时间(毫秒)]=datediff(ms,@d,getdate())  
  
SET STATISTICS IO OFF ;  
SET STATISTICS TIME OFF;  
GO