I need to insert multiple rows at once in sql server ..based on an iterative value

Question

Hi friends, I want to insert 3 rows at a time in a table based on select statement..

consider the query

insert into tblTemp 
(
a,b
)

select a, b from tblTemp2

This lets me insert one row in tblTemp..

my requirement is to add 3 rows with iterative values a,a+1,a+2 for each b inserted.

Answer 1

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 2

Use a cross join to generate extra rows (via Cartesian product), rather than querying tblTemp2 three times with UNION ALL

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 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