Question

我想基于select语句在表中一次插入3行..

考虑查询

insert into tblTemp 
(
a,b
)

select a, b from tblTemp2

这让我在tblTemp ..

中插入一行

我的要求是为每个插入的b添加3行迭代值a，a + 1，a + 2。

Answer 1

使用交叉连接生成额外的行（通过笛卡尔积），而不是使用UNION ALL查询tblTemp2三次

insert into tblTemp (a, b)
select a + offset, b
from
  tblTemp2
  cross join
  (SELECT 0 AS offset UNION ALL SELECT 1 UNION ALL SELECT 2) foo

Answer 2

insert into tblTemp ( a,b )
select a, b from tblTemp2 UNION ALL
select a+1, b from tblTemp2 UNION ALL
select a+2, b from tblTemp2 UNION ALL

Answer 3

Insert Into tblTemp (a,b)
SELECT T.a + T1.Num , T.B
FROM 
tblTemp2 T
CROSS JOIN
(
 SELECT 0 as Num
 UNION ALL
 SELECT 1 as Num
 UNION ALL
 SELECT 2 as Num 
) T1

Answer 4

declare @rbr int
set @rbr=0

while @rbr<3
begin
insert into tblTemp2
select a+@rbr, b from tblTemp2
set @rbr=@rbr+1
end

我需要在sql server中一次插入多行...基于迭代值

4 个答案: