插入在迴路記錄而沒有任何唯一列

Question

我具有例如下表不具有任何身份或獨特柱：

create table tbl_test (first_name nvarchar(255), last_name nvarchar(255), 
         [address] nvarchar(255)) 
Insert tbl_test values ('Andrei','Corovei','str Meteor') 
Insert tbl_test values ('Pop','Ionut','str Meteor') 
Insert tbl_test values ('Whitehead','John','str Lunii') 
Insert tbl_test values ('Grisham','Robert','str Corcoduselor') 
Insert tbl_test values ('Eugen','Johnesco','str Prunelor') 

我可以插入從上述表中的行的使用下面的另一表語法：

select * into tbl_test_loop from tbl_test 

這將在一次性插入中插入所有記錄。

我可以在批次數爲2的循環中插入上述結果而不是一次性創建任何Identity或rownumber函數嗎？

Answer 1

Declare @loopcount int 
Declare @rcount int 
Declare @idn int 
Declare @iteration int 
Declare @strsql varchar(1000) 

select @loopcount=2,@idn=1 
select @rcount=count(*) from tbl_test 
SET @iteration=(@rcount/@loopcount)+(@rcount%@loopcount) 

while(@idn<=@iteration) 
BEGIN 
SET @strsql='INSERT INTO tbl_test_loop select top '+cast(@loopcount as varchar(2))+' * from tbl_test t where not exists(select * from tbl_test_loop l where l.first_name = t.first_name and l.last_name = t.last_name and l.[address] = t.[address])' 
exec(@strsql) 
select 'inserted '+cast(@loopcount as varchar(2)) 
SET @idn=@idn+1 
END 

Answer 2

select tbl_test.* into tbl_test_loop from tbl_test, (select 1 as loop union select 2) v 

Answer 3

嘗試NTILE，無需循環：

select NTILE(3) OVER(ORDER BY (SELECT 1)) x, * 
into tbl_test_loop 
from tbl_test