Split a column based on even and odd rows

Question

Table1
      Table2
 Col1
Odd
Even
  A
 A
  B
  B
 C
  D
  C
 E
  F
  D
 G
  H
  E
 I
NULL
  F
  G
  H
  I
I am using MS SQL v2005
I want to split a column into two columns : -
one column must have all the odd rows data while the other column must have even rows data
in other words I want the data in Table1 to be displayed as data in Table2. 
Col, Odd and Even are column names

Answer 1

In SQL 2005 wont approach like what I suggested do only a single scan of the table?
A major problem with your solution is that you assume that 1) the values are contiguous 2) they are numeric. Try the below:
CREATE TABLE #t (id INT NOT NULL IDENTITY(1,1), Col1 CHAR(1))
INSERT INTO #t VALUES ('A'),('B'), ('C'),('D'), ('E'),('F'), ('G'), ('H'), ('I')
go
SELECT MAX(CASE WHEN Col1 % 2 > 0 THEN Col1 END),
MAX(CASE WHEN Col1 % 2 = 0 THEN Col1 END)
FROM
SELECT Col1,ROW_NUMBER() OVER (PARTITION BY (Col1 % 2) ORDER BY Col1) AS Rn
FROM #t
)t
GROUP BY Rn
go
; WITH numbering AS (
    SELECT Col1, row_number() OVER (ORDER BY Col1) AS rowno
    FROM   #t
), leading AS (
   SELECT Col1 AS odd, LEAD(Col1) OVER(ORDER BY rowno) AS even, rowno
   FROM   numbering
SELECT odd, even
FROM   leading
WHERE  rowno % 2 = 1
go
DROP TABLE #t
Erland Sommarskog, SQL Server MVP, [email protected]