在每一行中插入空白行

Question

I have a result like this:

name
Sally
Dan
Andy
Jackson

I used this query:

SELECT name from NAMEINFO where nNameIndex<5

and I want to get result like this:

name
Sally
(blank)
Dan
(blank)
Andy
(blank)
Jackson
(blank)

I tried query like this:

select name
from (
  select top 100 percent *
  from (
    SELECT nNameIndex, name
    FROM NAMEINFO 
    union all
    select nNameIndex, ''
    from NAMEINFO 
  ) as t
  order by 1
) as r

but result is:

name
Sally
Dan
Andy
Jackson
(blank)
(blank)
(blank)
(blank)

I want to insert blank row into every row in my SQL result. Where should I change my code to get wanted result?

Answer 1

select name, ROW_NUMBER() over (order by name) pos from NAMEINFO where nNameIndex < 5
union all
select '', ROW_NUMBER() over (order by name) from NAMEINFO where nNameIndex < 5
order by pos, name desc

but really you should not do this in your database but in the consuming application.

Answer 2

In your initial query, you almost have it:

  select name
  from (
    SELECT nNameIndex, name
    FROM NAMEINFO 
    union all
    select nNameIndex, ''
    from NAMEINFO 
  ) as t
  order by nNameIndex

Answer 3

You can try ROW_NUMBER() to achieve the results.

DECLARE @table table(name varchar(50))

insert into @table
values 
('Sally')
,('Dan')
,('Andy')
,('Jackson');


SELECT name
from
(
select name, ROW_NUMBER() OVER (ORDER BY name) as rnk from @table
union all
SELECT '',ROW_NUMBER() OVER (ORDER BY (SELECT null)) as rnk  from @table
) as t
order by rnk,name desc

+---------+
|  name   |
+---------+
| Andy    |
|         |
| Dan     |
|         |
| Jackson |
|         |
| Sally   |
|         |
+---------+